ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Unbekannt

Seismic Wave Propagation in Stratified Media (1983)

B. L. N. Kennett

Cambridge University Press

In: Cambridge, 342 pp., Cambridge University Press, vol. 13, no. XVI:, pp. 227-235, (ISBN 3-540-43528-X)

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983

Schlagwort(e): Textbook of geophysics ; Seismology ; Seismics (controlled source seismology) ; Waves

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

BIBLIOGRAFIE SEISMOLOGIE

S·F·X

2

Unbekannt

Fractals and Chaos in Geology and Geophysics (1992)

D. L. Turcotte

Cambridge University Press

In: Cambridge, Cambridge University Press, vol. 271, no. ALEX(01)-FR-77-01, AFTAC Contract F08606-76-C-0025, pp. 329, (ISBN: 0-08-043649-8)

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992

Schlagwort(e): FractureT ; Chaotic behaviour ; Handbook of geophysics ; Handbook of geology

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

BIBLIOGRAFIE SEISMOLOGIE

S·F·X

3

Unbekannt

Europe's lithosphere - seismic structure (1992)

J. Ansorge ; D. Blundel ; S. Mueller

Cambridge University Press

In: A Continent Revealed - the European Geotraverse, Cambridge, Cambridge University Press, vol. 37, pp. 33-69, (ISBN 0080419208)

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992

Schlagwort(e): Deep seismic sounding (espec. cont. crust) ; Review article ; Earth model, also for more shallow analyses ! ; European Geotraverse ; CRUST ; earth mantle ; Muller

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

BIBLIOGRAFIE SEISMOLOGIE

S·F·X

4

Unbekannt

Exploration Seismology Vol. 1, History, Theory and Data Acquisition (1982)

R. E. Sheriff ; L. P. Geldart

Cambridge University Press

In: Boston, 227 pp., Cambridge University Press, vol. Developments in Petroleum Science vol. 15B, no. Publ. No. 12, pp. 9, (ISBN 0-521-66023-8 hc (0-521-66953-7 pb))

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1982

Schlagwort(e): Textbook of geophysics ; Seismics (controlled source seismology)

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

BIBLIOGRAFIE SEISMOLOGIE

S·F·X

5

Unbekannt

Chaotic Dynamics: An Introduction (1990)

G. L. Baker ; J. P. Gollub

Cambridge University Press

In: Cambridge, Cambridge University Press, vol. 3, pp. 6322, (ISBN 0-521-79203-7)

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990

Schlagwort(e): Textbook of physics ; Chaotic behaviour ; FractureT

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

BIBLIOGRAFIE SEISMOLOGIE

S·F·X

6

Unbekannt

Fracture of Brittle Solids (1993)

B. R. Lawn

Cambridge University Press

In: Cambridge, Cambridge University Press, vol. 34, no. 22, pp. 65-70, (ISBN 0-691-12183-4, 2005 (481 pp. + CD-ROM))

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1993

Schlagwort(e): Textbook of geophysics ; Textbook of geology ; Rock mechanics ; Physical properties of rocks ; Fracture

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

BIBLIOGRAFIE SEISMOLOGIE

S·F·X

7

Unbekannt

Exploration Seismology Vol. 2, Data-Processing and Interpretation (1983)

R. E. Sheriff ; L. P. Geldart

Cambridge University Press

In: Boston, 227 pp., Cambridge University Press, vol. Developments in Petroleum Science vol. 15B, no. Publ. No. 12, pp. 9, (ISBN 0-521-66023-8 hc (0-521-66953-7 pb))

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983

Schlagwort(e): Textbook of geophysics ; Seismics (controlled source seismology)

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

BIBLIOGRAFIE SEISMOLOGIE

S·F·X

8

Unbekannt

The Groningen Radiocarbon Calibration Program (1993)

van der Plicht, Johannes

Cambridge University Press

In: Radiocarbon. 1993; 35(1): 231-237. Published 1993 Jan 01. doi: 10.1017/s0033822200013916.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1993-01-01

Beschreibung: Variations in atmospheric 14C content complicate the conversion of conventional 14C ages BP (i.e., years before AD 1950) into real calendar ages (AD/BC) (de Vries 1958; Willis, Tauber & Münnich 1960). These variations are indirectly observed in tree rings from European and North American wood. In recent decades, measurements made on dendrochronologically dated wood have resulted in the generally accepted Stuiver and Pearson calibration curves. These curves, together with other calibration data, were published in the first Radiocarbon Calibration Issue (Stuiver & Kra 1986), and are extended in the present Calibration Issue (Stuiver, Long & Kra 1993).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

9

Unbekannt

Reduction of CO2-to-Graphite Conversion Time of Organic Materials for 14C AMS (1992)

Thomsen, Mette S. ; Gulliksen, Steinar

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 330-334. Published 1992 Jan 01. doi: 10.1017/s0033822200063505.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: Graphite is the most common type of target for 14C accelerator mass spectrometry (AMS). It is readily produced by catalytic reduction of CO2, but the presence of a small amount of impurities (e.g., sulfur compounds) may retard the reaction. We have tested some techniques to find a method that reduces the impurity content of CO2 produced by combustion of organic material. We found that using water during combustion reduces the average time for graphite conversion of CO2 from organic matter from 〉3 h to ca. 2 h. This is the time for graphite production from CO2 obtained by acid hydrolysis of calcite. Measurements of known-age and background samples show that this combustion method neither changes the isotopic ratios nor introduces any additional background.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

10

Unbekannt

Calibration Curve for Short-Lived Samples, 1900–3900 BC (1993)

Vogel, J. C. ; van der Plicht, Johannes

Cambridge University Press

In: Radiocarbon. 1993; 35(1): 87-91. Published 1993 Jan 01. doi: 10.1017/s0033822200013837.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1993-01-01

Beschreibung: Both the Pretoria and the Groningen radiocarbon laboratories performed high-precision analyses on 1–4 annual tree-ring samples made available by Bernd Becker from his South German oak dendrochronological series (Vogel et al. 1986; de Jong, Becker & Mook 1986). The Pretoria measurements were extended to overlap the Groningen set, and now cover the range from 1930 to 3350 BC (Vogel et al. 1993). The tree-ring dating of the Groningen samples has been adjusted and now ranges from 3200 to 3900 BC (de Jong, Mook & Becker 1989). Taken together, the data provide a calibration curve over two millennia, which is especially suitable for short-lived samples. The curve is shown in Figures 1A–D.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

11

Unbekannt

14C Dating of Groundwater Containing Microbial CH4 (1992)

Hackley, K. C. ; Liu, C. L. ; Coleman, D. D.

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 686-695. Published 1992 Jan 01. doi: 10.1017/s0033822200063979.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: Groundwater samples were collected from several different depths in Illinois glacial deposits at a site in east-central Illinois. Dissolved gases were extracted from many of the water samples, measured volumetrically, and analyze by gas chromatography. The DIC was precipitated as barium carbonate and analyzed for both δ13C and 14C. Due to the formation of microbial CH4, some of the DIC had unusually heavy δ13C values of −3 to −1‰. The standard groundwate 14C-age correction models were developed to account for carbonate dissolution as the primary carbon input beneath the soil zone. If the heavy δ13C values observed in this study are used in readily available groundwater dating models without accounting for the effect of microbial methane formation, many of the resultant calculated ages are negaitive (future ages) mathematically unsolvable. Isotopic and analytical result show a positive correlation (r2 = 0.90) between the δ13C of the DIC and the concentration of methane in the groundwater. With this correlation, we were able to correct the δ13C values of the DIC which were altered due to microbial CH4 formation. This adjustment of δ13C values, along with estimation of dead carbon input from the redox processes, allowed us to calculate 14C ages using standard groundwater age correction models.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

12

Unbekannt

δ13C Measurements from the Irish Oak Chronology (1994)

McCormac, F. G. ; Baillie, M. G. L. ; Pilcher, J. R. ; [weitere]

Cambridge University Press

In: Radiocarbon. 1994; 36(1): 27-35. Published 1994 Jan 01. doi: 10.1017/s0033822200014296.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1994-01-01

Beschreibung: Measurements of the stable isotope ratio 13C/12C, relative to PDB, were made for fractionation correction purposes on all oak samples used in the Irish oak 14C calibration curve. Stable isotope data have not been published previously. We have collated the stable isotope data from the calibration work, carried out some further measurements to investigate anomalies in the original results, and generated tables of data that include site and tree information pertaining to both stable isotopes and source material for 14C calibration measurements. The data suggest that land-grown trees tend to be isotopically lighter than bog-grown wood, and that the Irish trees used in the calibration exercise tend to be isotopically heavier than those from Scotland and England. Preliminary analysis of the data is given.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

13

Unbekannt

Radiocarbon Dating of Travertines Precipitated from Freshwater (1992)

Mas-Pla, Josep ; Trilla, Josep ; Valls, Maria Lluisa

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 677-685. Published 1992 Jan 01. doi: 10.1017/s0033822200063967.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: We have studied the isotopic composition of recently precipitated travertines to determine the initial 14C activity of ancient travertine deposits. We found that the 14C activity of recent travertines of northeastern Spain was a function of the distance from the spring, resulting in variations in the initial 14C activity of the ancient travertine formations. We calculated the ancient travertine radiocarbon ages by using the ratio between the 14C activity of recent travertines and that of present atmospheric CO2 as the initial 14C activity.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

14

Unbekannt

To the Editors (1994)

Long, Austin ; Jull, A. J. T. ; Kra, Renee S.

Cambridge University Press

In: Radiocarbon. 1994; 36(3): iii-iii. Published 1994 Jan 01. doi: 10.1017/s003382220001448x.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1994-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

15

Unbekannt

Human Settlements and the Last Deglaciation in the French Alps (1994)

Evin, Jacques ; Bintz, Pierre ; Monjuvent, Guy

Cambridge University Press

In: Radiocarbon. 1994; 36(3): 345-357. Published 1994 Jan 01. doi: 10.1017/s0033822200014521.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1994-01-01

Beschreibung: According to most geological and geomorphological studies, the maximal advance of the Würmian glaciers in the French Alps occurred at least before 40 ka bp and cannot be dated by 14C. Scientists believed that this dating method could be used for dating the last glacial advance and late deglaciation in the region. The scarce and scattered 14C dating results available from geological samples do not confirm an early (ca. 18 or 20 ka bp) age for the total cooling of the ice nor do they prove that residual ice sheets remained at low elevations. Attempting to solve this chronological problem, we compiled current archaeological knowledge of the oldest Late Paleolithic sites. A review of their 14C results shows that no site older than 15 ka bp (with Gravettian, Solutrean or early Magdalenian industries) can be found east of the Saône-Rhône Valley, even at low elevations. Only rare sites, dated to ca. 14.5 ka bp, may be found close to the mountain regions that were suddenly occupied around the beginning of the Bølling period (ca. 13.5 ka bp). Thus, it seems that the eastern Alps offer no evidence for direct association between glacial retreat and human settlement or simultaneous occurrence in early or late deglaciated areas.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

16

Unbekannt

Laboratories – Code Designations (1993)

Cambridge University Press

In: Radiocarbon. 1993; 35(3): 513-534. Published 1993 Jan 01. doi: 10.1017/s0033822200060562.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1993-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

17

Unbekannt

Laboratories, (1991)

Cambridge University Press

In: Radiocarbon. 1991; 33(3): 379-397. Published 1991 Jan 01. doi: 10.1017/s0033822200040418.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

18

Unbekannt

Cuello: Resolving the Chronology Through Direct Dating of Conserved and Low-Collagen Bone by AMS1 (1991)

Law, I. A. ; Housley, R. A. ; Hammond, Norman ; [weitere]

Cambridge University Press

In: Radiocarbon. 1991; 33(3): 303-315. Published 1991 Jan 01. doi: 10.1017/s0033822200040339.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Beschreibung: It is well known that 14C dating of fossil bone with seriously depleted protein levels, or bone that has been consolidated with preservatives, can produce erroneous results. In the tropics, warm and moist soil conditions lead to constant reworking of organic matter and add to the danger of bone contamination. Because of this, 14C dating of preservative-impregnated bone from such areas has rarely been successful. We report here a set of AMS dates on both unconsolidated animal bone and polyvinyl acetate/polyvinyl alcohol (PVA/PV-OH) impregnated human burials from the Maya site of Cuello, Belize. The steps needed to purify the samples are described, together with details on the use of qualitative infra-red (IR) spectra as a means of assessing sample purity.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

19

Unbekannt

Rudjer Bošković Institute Radiocarbon Measurements XII (1992)

Srdoč, Dušan ; Horvantinčić, Nada ; Bronić, Ines Krajcar ; [weitere]

Cambridge University Press

In: Radiocarbon. 1992; 34(1): 155-175. Published 1992 Jan 01. doi: 10.1017/s0033822200013485.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: We present here radiocarbon analyses made since our previous list (Srdoč et al. 1989). Sample pretreatment, combustion and counting techniques are essentially the same as described previously (Srdoč, Breyer & Sliepčević 1971), supplemented by new techniques for groundwater processing (Srdoč et al. 1979). The calculation of ages follows conventional protocol (Stuiver & Polach 1977). These ages can be converted from the 5570-year half-life to the chronometrically more correct half-life of 5730 years by multiplying by the factor, 1.029. Ages and standard deviations of all samples are adjusted for stable isotope fractionation according to the recommendations in Stuiver and Polach (1977), except for groundwater, calcareous deposits and aquatic plants. The δ13C values of the latter reflect the environmental conditions during their formation or growth rather than fractionation (Mook 1976; Krajcar Bronić et al. 1986; Marčenko et al. 1989). Thus, any percent modern (pMC) correction based on δ13C values is meaningless or even misleading. Sample descriptions are prepared in collaboration with collectors and submitters. Calibrated ages were calculated using the program of Stuiver and Reimer (1987).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

20

Unbekannt

Acknowledgments (1992)

Cambridge University Press

In: Radiocarbon. 1992; 34(2): iv-iv. Published 1992 Jan 01. doi: 10.1017/s0033822200013588.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

21

Unbekannt

Harwell Radiocarbon Measurements X (1991)

Walker, A J ; Young, A W ; Otlet, R L

Cambridge University Press

In: Radiocarbon. 1991; 33(1): 87-113. Published 1991 Jan 01. doi: 10.1017/s0033822200013230.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Beschreibung: This is the third of the series of lists of English archaeologic dates submitted to Harwell for measurement by the Historic Buildings and Monuments Commission for England and Wales within a prescribed contractual period. This list of 155 dates covers the period April 1987 to March 1988 and results are reported whether the associated projects are completed or on-going.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

22

Unbekannt

Participants (1991)

Cambridge University Press

In: Radiocarbon. 1991; 33(2): 265-276. Published 1991 Jan 01. doi: 10.1017/s0033822200053662.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

23

Unbekannt

Harwell Radiocarbon Measurements IX (1991)

Walker, A J ; Young, A W ; Keyzor, R S ; [weitere]

Cambridge University Press

In: Radiocarbon. 1991; 33(1): 79-86. Published 1991 Jan 01. doi: 10.1017/s0033822200013229.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Beschreibung: The results in this list come from our earlier years of operation and form part of the special series of lists being prepared to clear the backlog of unpublished dates from this laboratory, in this case 49 samples coming from sites in and around Northampton, UK. They originate from excavations directed by John Williams and Helen M Bamford of the Northampton Development Corporation between 1973 and 1982, and all were submitted for measurement and paid for by the Ancient Monuments Laboratory of the Historic Buildings and Monuments Commission for England and Wales.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

24

Unbekannt

A Tandem Mass-Spectrometric Method of Cosmogenic Isotope Analysis (1992)

Pavlov, A. K. ; Kogan, V. T. ; Gladkov, G. Y.

Cambridge University Press

In: Radiocarbon. 1992; 34(2): 271-276. Published 1992 Jan 01. doi: 10.1017/s0033822200013722.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: We propose an original method for analysis of low-concentrations of stable and long-lived radioactive nuclides. We discuss the parameters of the main features of the “Trace” spectrometer (a multicharged-ion laser source, a highly sensitive time-of-flight mass spectrometer, a charge-exchange chamber and a mass spectrometer for positive and negative single-charged ion analysis). We also compare these features with conventional AMS devices.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

25

Unbekannt

Time-Resolved Liquid Scintillation Counting (1990)

Kessler, Michael

Cambridge University Press

In: Radiocarbon. 1990; 32(3): 381-386. Published 1990 Jan 01. doi: 10.1017/s0033822200013047.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: Historically, scientists who perform low-level measurements of 14C for age dating, and 3H2O for environmental contamination, have purchased or constructed highly specialized instruments to quantitate low-level radionuclides using a general-purpose liquid-scintillation analyzer (LSA). The LSA uses special time-resolved 3-D spectrum analysis (TR-LSC) to reduce background without substantially affecting sample counting efficiency. This technique, in combination with a special slow fluor scintillating plastic, further reduces the minimal detectable limit for the TR-LSC liquid scintillation counter.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

26

Unbekannt

A Late Quaternary Stratigraphic Framework for Eastern Mediterranean Sapropel S1 Based on AMS 14C Dates and Stable Oxygen Isotopes (1991)

Troelstra, S R ; Ganssen, G M ; van der Borg, Klaas ; [weitere]

Cambridge University Press

In: Radiocarbon. 1991; 33(1): 15-21. Published 1991 Jan 01. doi: 10.1017/s0033822200013175.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Beschreibung: Detailed stable oxygen isotope analyses coupled with AMS 14C measurements on an eastern Mediterranean sapropel S1 sequence indicate that adverse bottom conditions persisted for ca 8000 years. AMS dates on additional sequences show that complete bottom anoxia lasted for 300-800 years. The S1 event is not synchronous throughout the eastern Mediterranean, but started earlier in the deeper parts of the basin.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

27

Unbekannt

Łódź Radiocarbon Dates III (1991)

Kanwiszer, Andrzej ; Trzeciak, Paweł

Cambridge University Press

In: Radiocarbon. 1991; 33(1): 115-130. Published 1991 Jan 01. doi: 10.1017/s0033822200013242.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Beschreibung: The results presented in this list were obtained from 1986 to 1989. Equipment, measurement and treatment of samples are as reported previously (Kanwiszer & Trzeciak 1984: 111). Age calculations are based on a contemporary value equal to 95% of the activity of NBS oxalic acid standard and on the conventional half-life for 14C of 5568 ± 30 years. Results are reported in years before 1950 (years BP). Errors quoted (± 1σ) include standard deviations of count rates for the unknown sample, contemporary standard and background. The dates are not corrected for 13C fractionation. Descriptions and comments are based on information supplied by submitters of samples.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

28

Unbekannt

Radiocarbon Dating Reproducibility at the Museo de La Plata Radiocarbon Laboratory (1990)

Figini, Anibal ; Huarte, Roberto ; Carbonari, Jorge

Cambridge University Press

In: Radiocarbon. 1990; 32(3): 301-305. Published 1990 Jan 01. doi: 10.1017/s0033822200012923.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: We discuss here the variability, for our laboratory, in counting for radiocarbon dating of replicate measurements of background and secondary modern standard, duplicate measurements of samples provided by the International Collaborative Study, and replicate measurements of the dilution of the 14C-labeled benzene standard. The variability in the measurements of the International Collaborative Study samples suggest the existence of systematic bias.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

29

Unbekannt

Checking Back on an Assemblage of Published Radiocarbon Dates (1990)

Baillie, M G L

Cambridge University Press

In: Radiocarbon. 1990; 32(3): 361-366. Published 1990 Jan 01. doi: 10.1017/s0033822200013011.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: It is clear that radiocarbon researchers take a forward view towards the improvement of accuracy and precision in dating. Unfortunately, archaeologists base much of their research on the published dates produced in the past. Archaeologists and other users of radiocarbon dates should understand the limitations associated with past dates. This article addresses these limitations by looking at a large number of routine radiocarbon dates associated with a block of English tree-ring chronologies, the true ages of which are now known within close limits. My conclusion supports the idea of global multiplication factors as proposed by the International Study Group (1982).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

30

Unbekannt

A Quality Assurance Protocol for Radiocarbon Dating Laboratories (1990)

Long, Austin

Cambridge University Press

In: Radiocarbon. 1990; 32(3): 393-397. Published 1990 Jan 01. doi: 10.1017/s0033822200013072.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: The purpose of this Quality Assurance (QA) protocol is to summarize guidelines that have been accepted by directors of many radiocarbon dating laboratories throughout the world, and by the International Atomic Energy Agency (IAEA). Some laboratories have followed similar procedures successfully for years. Laboratories that carefully adhere to this protocol will produce consistently reliable data that will be comparable in accuracy to all other laboratories following this or any other equally rigorous quality assurance program. This statement does not, however, pertain to samples with 14C activities highly sensitive to method or degree of pretreatment, as pretreatment techniques vary among laboratories.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

31

Unbekannt

Sources of Random Error in the Debrecen Radiocarbon Laboratory (1990)

Hertelendi, Ede

Cambridge University Press

In: Radiocarbon. 1990; 32(3): 283-287. Published 1990 Jan 01. doi: 10.1017/s0033822200012893.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: A new high-pressure methane-filled counter system for 14C dating was installed in 1986 when the first stage of the International Collaborative Study (ICS) started. Random errors in the new measuring system and in the process of chemical pretreatment and preparation were checked during the three years of intercomparison. Results show that the most important source of error in our laboratory is gas contamination. This causes variation of the count rate to exceed the statistically expected variability. Other sources of error are also discussed and limits of their contributions are given.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

32

Unbekannt

Radiocarbon Dates for Lava Flows and Pyroclastic Deposits on São Miguel, Azores (1991)

Moore, Richard B ; Rubin, Meyer

Cambridge University Press

In: Radiocarbon. 1991; 33(1): 151-164. Published 1991 Jan 01. doi: 10.1017/s0033822200013278.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1991-01-01

Beschreibung: We report 63 new radiocarbon analyses of samples from São Miguel, the largest (ca 62 × 13km) and most populous (ca 150,000 inhabitants) island in the Azores archipelago (Fig 1). The samples are mainly carbonized tree roots and other plant material collected from beneath 20 mafic lava flows and spatter deposits and from within and beneath 42 trachytic pyroclastic flow, pyroclastic surge, mudflow, pumice-fall, and lacustrine deposits and lava flows. One calcite date is reported. The samples were collected during geologic mapping of the entire island (Moore, in press A; sample locations are shown on this map). Nine 1:25,000-scale topographic maps, published in 1983 by the Portuguese Army Cartographic Service, cover the island; samples and locations described below refer to these named sheets.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

33

Unbekannt

Laboratories (1990)

Cambridge University Press

In: Radiocarbon. 1990; 32(2): 237-252. Published 1990 Jan 01. doi: 10.1017/s0033822200040224.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

34

Unbekannt

Systematic Biases in Results of the International Collaborative Study and Their Probable Sources (1990)

Pazdur, Mieczysław F ; Awsiuk, Romuald ; Goslar, Tomasz ; [weitere]

Cambridge University Press

In: Radiocarbon. 1990; 32(3): 289-294. Published 1990 Jan 01. doi: 10.1017/s003382220001290x.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: Results of the International Collaborative Study show an unexpectedly large scatter of individual dates as well as systematic biases. Very high values of linear correlation coefficients are observed for all results of Stage 2 and for benzene samples of Stage 1. We observed moderate correlations for carbonate samples and the lowest for natural samples of wood and peat of Stage 3. The correlation is practically negligible among results obtained in different stages. The probable reasons for such effects are seen in medium-term changes in the calibration of the counting systems.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

35

Unbekannt

Discussion - Session I (1990)

Cambridge University Press

In: Radiocarbon. 1990; 32(3): 279-279. Published 1990 Jan 01. doi: 10.1017/s0033822200012881.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

36

Unbekannt

Calibrating New Zealand Radiocarbon Dates of Marine Shells (1990)

McFadgen, B G ; Manning, M R

Cambridge University Press

In: Radiocarbon. 1990; 32(2): 229-232. Published 1990 Jan 01. doi: 10.1017/s0033822200040194.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: Radiocarbon activity of 11 modern marine shell samples from the New Zealand region is enhanced compared with the surface layers of the average world ocean. The measured enhancement, δR, is equivalent to −31 ± 13 years. On this basis, the Institute of Nuclear Sciences will now use a value of −30 years in reporting calibrated ages for marine shell samples.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

37

Unbekannt

Museo de la Plata Radiocarbon Measurements II (1990)

Figini, Anibal J ; Carbonari, Jorge E ; Huarte, Roberto A

Cambridge University Press

In: Radiocarbon. 1990; 32(2): 197-208. Published 1990 Jan 01. doi: 10.1017/s0033822200040170.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: The 14C measurements reported here were made between 1983 and 1987. Sample pretreatment and date calculations were previously reported (Figini et al 1984). The method employed, liquid scintillation counting, was previously described (Huarte & Figini 1988). No 13C/12C ratios were measured and results were not corrected for 13C fractionation and/or reservoir effect. Descriptions, comments and references to publications are based on information supplied by submitters.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

38

Unbekannt

Discussion: Recovery from Tracer Contamination in AMS Sample Preparation (1990)

Jull, A J T ; Donahue, D J ; Toolin, L J

Cambridge University Press

In: Radiocarbon. 1990; 32(1): 84-85. Published 1990 Jan 01. doi: 10.1017/s0033822200039977.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

39

Unbekannt

Marine Turtle Bones from an Archaeological Site in Polynesia Yield Reliable Age Determinations (1990)

Dye, T S

Cambridge University Press

In: Radiocarbon. 1990; 32(2): 143-147. Published 1990 Jan 01. doi: 10.1017/s0033822200040133.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: Accelerator mass spectrometry dating of three 50g samples of marine turtle bone from the basal cultural stratum of the Tongoleleka archaeological site, Lifuka Island, Kingdom of Tonga, South Pacific yields results that agree with conventional 14C dates on marine shell. A method for calibrating these dates that takes into account the long distance migrations of marine turtles in the South Pacific is proposed. A sample size greater than 50g is recommended for routine AMS dating of marine turtle bone.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

40

Unbekannt

Superconducting Mini-Cyclotrons as AMS Instruments (1990)

Subotic, K M ; Milinkovic, L S ; Zupancic, M T ; [weitere]

Cambridge University Press

In: Radiocarbon. 1990; 32(1): 1-6. Published 1990 Jan 01. doi: 10.1017/s0033822200039898.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Beschreibung: We have studied the limitations of conventional mass spectrometry and have examined accelerator based methods which could help circumvent these limitations. In particular, cyclotron-based accelerator mass spectrometric (AMS) techniques are discussed with an emphasis on evaluating performances of superconducting mini-cyclotrons designed for use as AMS instruments. We discussed the design of superconducting mini-cyclotrons dedicated to radioisotope dating research.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

41

Unbekannt

Serge Alexander Korff (1990)

Cambridge University Press

In: Radiocarbon. 1990; 32(1): iv-iv. Published 1990 Jan 01. doi: 10.1017/s0033822200039886.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1990-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

42

Unbekannt

Rudjer Bošković Institute Radiocarbon Measurements VIII (1984)

Srdoč, Dušan ; Obelic, Bogomil ; Horvatinčic, Nada ; [weitere]

Cambridge University Press

In: Radiocarbon. 1984; 26(3): 449-460. Published 1984 Jan 01. doi: 10.1017/s0033822200006809.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: The following radiocarbon date list contains dates of samples measured since our previous list (R, 1982, v 24, p 352–371). As before, age calculations are based on the Libby half-life (5570 ± 30) yr and reported in years before 1950. The modern standard is 0.95 of the NBS oxalic acid activity. Sample pretreatment, combustion, and counting technique are essentially the same as described in R, 1971, v 13, p 135–140, supplemented by new techniques for groundwater processing (R, 1979, v 21, p 131–137).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

43

Unbekannt

Non-Concordance of Radiocarbon and Amino Acid Racemization Deduced Age Estimates on Human Bone (1983)

Taylor, R E

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 647-654. Published 1983 Jan 01. doi: 10.1017/s003382220000597x.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: Radiocarbon determinations, employing both decay and direct counting, were obtained on various organic fractions of four human skeletal samples previously assigned ages ranging from 28,000 to 70,000 years on the basis of their D/L aspartic acid racemization values. In all four cases, the 14C values require an order of magnitude reduction in age.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

44

Unbekannt

The Integration of Radiocarbon Dating in Archaeology (1983)

Waterbolk, H T

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 639-644. Published 1983 Jan 01. doi: 10.1017/s0033822200005956.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: In the past 30 years many hundreds of archaeologic samples have been dated by radiocarbon laboratories. Yet, one cannot say that 14C dating is fully integrated into archaeology. For many archaeologists, a 14C date is an outside expertise, for which they are grateful, when it provides the answer to an otherwise insoluble chronologic problem and when it falls within the expected time range. But if a 14C date contradicts other chronologic evidence, they often find the ‘solution’ inexplicable. Some archaeologists are so impressed by the new method, that they neglect the other evidence; others simply reject problematic 14C dates as archaeologically unacceptable. Frequently, excavation reports are provided with an appendix listing the relevant 14C dates with little or no discussion of their implication. It is rare, indeed, to see in archaeologic reports a careful weighing of the various types of chronologic evidence. Yet, this is precisely what the archaeologist is accustomed to do with the evidence from his traditional methods for building up a chronology: typology and stratigraphy. Why should he not be able to include radiocarbon dates in the same way in his considerations?

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

45

Unbekannt

The Reliability of Archaeologic Interpretation of 14C Dates (1983)

Willkomm, Horst

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 645-646. Published 1983 Jan 01. doi: 10.1017/s0033822200005968.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: 14C dates of a medieval settlement with archaeologically well-dated strata are compared with the true ages of the respective layers. The 14C values indicate that each layer may contain older material reaching up to the beginning of settlement. Therefore, the 14C measurement of only a few wood or charcoal samples may lead to age estimations several hundred years too old.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

46

Unbekannt

Stable Isotope Fractionation During Benzene Synthesis for Radiocarbon Dating (1983)

Panarello, Hector O ; Albero, Miguel C ; Angiolini, Fernando E

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 529-532. Published 1983 Jan 01. doi: 10.1017/s0033822200005828.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: 13C isotope analyses of different stages of benzene synthesis have been made to study partial isotope fractionation. More than 60 analyses of carbonates, charcoal, carbon dioxide, and benzene were made in a double collector mass spectrometer. In the first stage of the synthesis (conversion to carbon dioxide) little or no fractionation was observed, beyond the analytical error of the method. Later stages of the process, show a greater and systematic fractionation. The experimental techniques are described.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

47

Unbekannt

An Evaluation of Shielding Characteristics Applicable to Mini-Gas Proportional-Counter-Based 14C Dating Systems (1983)

Kaihola, Lauri ; Kojola, Hannu ; Polach, Henry ; [weitere]

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 577-580. Published 1983 Jan 01. doi: 10.1017/s0033822200005889.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: A mini-gas-proportional counter prototype of 10ml capacity (at NTP) was constructed of oxygen-free Finnish copper. The counter tube will be one of 16 equivalent tubes of a small-sample gas counting system, which is equipped with passive graded shield made of lead, cadmium, and copper and a dual active anticoincidence shield, consisting of an external cosmic gas-proportional and an internal plastic scintillation guard. The aim of this study was to evaluate the parameters leading to the design of a cost-effective and compact shielding package for mini-counters.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

48

Unbekannt

A Secondary Standard for Radiocarbon Dating (1983)

Angiolini, Fernando E ; Albero, Miguel C

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 541-546. Published 1983 Jan 01. doi: 10.1017/s0033822200005841.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: The preparation and calibration of a secondary standard for the INGEIS Radiocarbon Dating Laboratory are presented. This standard is barium carbonate with a specific activity almost twice that of NBS oxalic acid. It was prepared from BaCO3 with high specific activity and commercial potassium carbonate by an isotopic dilution technique. The advantages of this standard are: 1) the preparation is simple and can be achieved with ordinary labware; 2) the production of CO2 by acid attack from this carbonate shows minimum isotopic fractionation. At least, it has less fractionation than wet oxidation of oxalic acid, the problems of which are described in the literature. This standard ensures better reproducibility in activity measurements; 3) despite some problems of activity exchange with atmospheric CO2 concerning carbonates, measurements of activity over a period of about two years have shown no significant deviation from the mean value. A tentative explanation of this phenomenon is also given. The activity ratio between BaCO3 and NBS oxalic acid is given with its error, and the statistical tests used in the calibration are briefly explained. Finally, a control chart for the activity of the standard over a long period is drawn, showing non-significant deviation and supporting the usefulness of this standard.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

49

Unbekannt

Radiocarbon Database: A Pilot Project (1983)

Gulliksen, Steinar

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 661-666. Published 1983 Jan 01. doi: 10.1017/s0033822200005993.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: Computer storage and surveys of large sets of data should be an attractive technique for users of 14C dates. Our pilot project demonstrates the effectiveness of a text retrieval system, NOVA STATUS. A small database comprising ca 100 dates, selected from results of the Trondheim 14C laboratory, is generated. Data entry to the computer is made by feeding typewritten forms through a document reader capable of optical character recognition. A text retrieval system allows data input to be in a flexible format. Program systems for text retrieval are in common use and easily implemented for a 14C database.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

50

Unbekannt

Possibilities in the Dating of Writing Materials and Textiles (1983)

Burleigh, Richard ; Baynes-Cope, A D

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 669-674. Published 1983 Jan 01. doi: 10.1017/s0033822200006019.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: This paper discusses the characteristics of the commoner classes of writing materials and textiles deriving from ancient and more recent historical sources and the problems they present for 14C dating. The materials under consideration are, firstly, paper in various forms, parchment, and vellum (ancient papyrus, which poses different kinds of dating problems, is not considered) and secondly, fabrics such as linen, cotton, and woolen textiles, to which, from the dating point of view, similar technical considerations apply. Our main concern is with problems associated with the dating of paper.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

51

Unbekannt

Long-Term Variability of Temperature and 14C in the Gulf Stream: Oceanographic Implications (1983)

Druffel, Ellen M

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 449-458. Published 1983 Jan 01. doi: 10.1017/s0033822200005749.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: Variability in temperature and 14C levels are recorded in coralline aragonite that grew in the Gulf Stream during the past four centuries. In particular, 18O/16O ratios reflect a decrease of ca 1°C in surface water temperature during the latter part of the Little Ice age. 14C levels also rose in the surface waters of the Gulf Stream and in atmospheric CO2 during the Maunder minimum. These observations indicate that ocean circulation may have been significantly different in the North Atlantic around the beginning of the 18th century.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

52

Unbekannt

Radiocarbon Dating of Copper-Preserved Organics (1992)

Beukens, R. P. ; Pavlish, L. A. ; Hancock, R. G. V. ; [weitere]

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 890-897. Published 1992 Jan 01. doi: 10.1017/s0033822200064213.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: The small but vital role of 14C dating in archaeometric research is clearly shown in the copper project reported herein. The 14C ages place a time perspective on the “Old Copper Culture Complex,” substantiating early Libby dates that had been questioned. The respective roles of INAA, PGE and Pb isotope work are briefly summarized. A long tradition of heat treatment from Paleoindian stone to Archaic copper is suggested.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

53

Unbekannt

British Museum Natural Radiocarbon Measurements XIII (1982)

Burleigh, Richard ; Matthews, Keith

Cambridge University Press

In: Radiocarbon. 1982; 24(2): 151-170. Published 1982 Jan 01. doi: 10.1017/s0033822200005014.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1982-01-01

Beschreibung: The following list consists of dates for archaeologic samples mostly measured from July 1976 to December 1977. The dates were obtained by liquid scintillation counting of benzene using the laboratory procedures outlined in previous lists (see, eg, BM-VIII, R, 1976, v 18, p 16). Dates are expressed in radiocarbon years relative to ad 1950 based on the Libby half-life for 14C of 5570 yr, and are corrected for isotopic fractionation (δ13C values are relative to PDB). No corrections have been made for natural 14C variations (although in some instances approximate calibrated dates taken from the tables of R M Clark (1975) have been given in the comments where this aids interpretation of results). The modern reference standard is NBS oxalic acid (SRM 4990). Errors quoted with the dates are based on counting statistics alone and are equivalent to ± 1 standard deviation (± 1σ), Dates in this and the next list (BM-XIV) reported to submitters or published elsewhere before the introduction of the new guidelines for rounding of computed figures have deliberately been left unrounded. From BM-XV onwards all BM dates will be rounded before publication in conformity with the recently recommended procedures (R, 1977, v 19, p 362). Descriptions, comments, and references to publications are based on information supplied by submitters.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

54

Unbekannt

ANU Radiocarbon Date List X (1983)

Polach, Henry ; Barton, Charles

Cambridge University Press

In: Radiocarbon. 1983; 25(1): 30-38. Published 1983 Jan 01. doi: 10.1017/s0033822200005282.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: 14C ages were obtained for the Australian lakes recorded below in order to complement research into their magnetic stratigraphy and sedimentology. It has been possible to establish precise 14C chronologies in six separate lakes, and also to compare ages obtained from stratigraphically equivalent horizons in different parts of the same lake so as to determine the reproducibility of these ages.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

55

Unbekannt

Time Series Analysis of Low Level Gas Counting Data (1984)

Kaihola, Lauri ; Polach, Henry ; Kojola, Hannu

Cambridge University Press

In: Radiocarbon. 1984; 26(2): 159-165. Published 1984 Jan 01. doi: 10.1017/s0033822200006597.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: We demonstrate the feasibility of pulse time of arrival information for early detection of periodic events in low level counting. Time of arrival data allows us to apply time series analysis and serial correlation tests which, in graphic form, give the user an illustrative view of the parameters affecting the validity of counting statistics. The decision to discontinue counting can already be made on the basis of less than 100 counts from the time information alone if more than 10 of these are non-Poisson periodic counts. The analyses also serve as a means of quality control for low level counting, being directly based upon the interval distribution of the Poisson process.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

56

Unbekannt

The First 20 Years of Radiocarbon Dating: An Annotated Bibliography, 1948-68; A Pilot Study (1980)

Polach, Dilette

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 997-1004. Published 1980 Jan 01. doi: 10.1017/s0033822200010420.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: A bibliography of the radiocarbon dating literature for the years 1948-68, which is in the process of compilation, is examined and a format is proposed. A survey of literature growth has also been undertaken. This enables projections of the numbers of publications referring to radiocarbon dating to be made. The estimated number of publications for the year 1978 is compared to literature retrieval obtained by interrogating eight relevant computer data bases. It is concluded that computer information retrieval is not satisfactory. Bibliographic control of radiocarbon dating literature would be best achieved by a bibliography dedicated to the subject and updated at regular intervals.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

57

Unbekannt

Measurement of Carbon Fixation and Allocation Using 11C-Labeled Carbon Dioxide (1983)

Strain, Boyd R ; Goeschl, John D ; Jaeger, Charles H ; [weitere]

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 441-446. Published 1983 Jan 01. doi: 10.1017/s0033822200005737.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: The real-time measurement of net photosynthesis and dark respiration of plants has been possible since the development of the infra-red analyzer and its application in the 1940's. This technique has allowed intensive investigations of the mechanisms and dynamics of carbon dioxide assimilation by green plants (Sestak, Catsky, and Jarvis, 1971). As a result, physiologic and ecologic aspects of net carbon dioxide exchange are the subject of much research (eg, Osmond, Bjorkman and Anderson, 1980).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

58

Unbekannt

University of Saskatchewan Radiocarbon Dates X (1984)

Rutherford, A A ; Wittenberg, Jurgen ; Gordon, B C

Cambridge University Press

In: Radiocarbon. 1984; 26(2): 241-292. Published 1984 Jan 01. doi: 10.1017/s0033822200006652.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: This series reports some of the measurements made since publication of the last list (R, 1981, v 23, p 94–135). Also included are a number of earlier dates previously withheld pending submitter evaluation. For some the authors have been unable to obtain appropriate comment. References to other publication of these dates are given where known.Acetylene proportional gas counting methods essentially remain as described in Saskatchewan II (R, 1960, v 2, p 73). Bone dating is carried out on soluble collagen extract (Longin, 1971) since 1978.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

59

Unbekannt

Frankfurt Radiocarbon Dates I (1984)

Protsch, Reiner ; Weninger, Bernhard

Cambridge University Press

In: Radiocarbon. 1984; 26(2): 185-195. Published 1984 Jan 01. doi: 10.1017/s0033822200006615.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: Facilities for radiocarbon dating were established at the University of Frankfurt/Main in the Institute of Anthropology. The Radiocarbon Laboratory provides assistance to the Amino-Acid-Dating Laboratory. This list reports on 14C dates measured up to September 1983.The laboratory is installed in the basement of a three-story building and is equipped with a 2L copper proportional counter filled to 1013 mbar with purified CO2. The counter is protected against cosmic and surrounding radiation by a 3.5 ton lead shield and a copper multiwire anticoincidence ring-counter flushed with purified 90Ar/10CH4. Electronics are of the commercial NIM type. Charcoal and wood samples are treated by standard acid-alkali-acid methods. Bone samples are treated according to the collagen methods described by Berger, Horney, and Libby (1964), Longin (1971), Protsch (1972; 1975), and Protsch and Berger (1973).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

60

Unbekannt

Report On the Workshop On the Calibration of the Radiocarbon Dating Time Scale (1980)

Damon, P E ; Lerman, J C ; Long, Austin ; [weitere]

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 947-949. Published 1980 Jan 01. doi: 10.1017/s0033822200010353.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

61

Unbekannt

British Museum Natural Radiocarbon Measurements XVII (1984)

Burleigh, Richard ; Ambers, Janet ; Matthews, Keith

Cambridge University Press

In: Radiocarbon. 1984; 26(1): 59-74. Published 1984 Jan 01. doi: 10.1017/s0033822200006457.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: The following list consists of dates for archaeologic and geologic samples mostly measured from June 1982 to June 1983. The dates were obtained by liquid scintillation counting of benzene using the laboratory procedures outlined in previous lists (see, eg, BM-VIII, R, 1976, v 18, p 16). Dates are expressed in radiocarbon years relative to ad 1950 based on the Libby half-life for 14C of 5570 yr, and are corrected for isotopic fractionation (δ13C values are relative to PDB). No corrections have been made for natural 14C variations. The modern reference standard is NBS oxalic acid (SRM 4990). Errors quoted with dates are based on counting statistics alone and are equivalent to ± 1 standard deviation (± 1σ). Descriptions, comments, and references to publications are based on information supplied by submitters.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

62

Unbekannt

Geological Survey of Japan Radiocarbon Dates I (1984)

Togashi, Shigeko ; Matsumoto, Eiji

Cambridge University Press

In: Radiocarbon. 1984; 26(2): 206-211. Published 1984 Jan 01. doi: 10.1017/s0033822200006639.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: This radiocarbon laboratory began operation in 1980 using the benzene scintillation method. The benzene synthesizer is essentially identical with that of Ikeda (1976). A liquid scintillation counter is Aloca LSC-LB1. Samples dated are wood, charcoal, shell, and coral.Pretreatment of wood and charcoal is a standard acid-alkali procedure, using 2% HCl and 2% NaOH at elevated temperatures. Charcoal is further heated in concentrated HNO3 for one hour, diluted in water, stands one night, and is washed and dried. Pretreated wood and charcoal are carbonized before combustion. The combustion products are passed over CuO, and are collected in an ammonium hydroxide bubbler system, and precipitated with calcium chloride.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

63

Unbekannt

W F Libby and the Archaeologists, 1946-1948 (1980)

Marlowe, Greg

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 1005-1014. Published 1980 Jan 01. doi: 10.1017/s0033822200010432.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: Archaeologists began to participate in cross-disciplinary endeavors in the 1930's, albeit on a very limited basis. The passage of time found members of that discipline unprepared for collaboration with physical scientists when W F Libby announced the development of the radiocarbon dating method. Libby proposed to apply to archeologic and geologic samples techniques based on ideas that were completely foreign to archeology …. The initial reactions of archeologists were sometimes amusing but more often significant, for they led to the foundation and emergence of the radiocarbon chronology that has so profoundly affected our understanding of prehistory (Johnson, 1967, p 165).To date, our historical knowledge about the nature, function, and impact of the early (1946-1948) relations between Libby and American archaeologists has come to us in the form of published anecdotes, many of which contain inaccurate information. The author's access to W F Libby's private 14C correspondence, combined with data obtained from interviews with some of the principal participants throughout this period, offers many new or different insights into the nascent years of radiocarbon dating. When, and under what unexpected cricumstances, did Libby first encounter representatives of the achaeologic community? What strategies were employed to facilitate diffusion of knowledge about 14C dating across disciplinary boundaries? How did archaeologists respond to the introduction or “intrusion” into their field of Libby's radioactive age-measurement tool?

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

64

Unbekannt

A Multi-Counter System for High Precision Carbon-14 Measurements (1980)

Schoch, Hildegard ; Bruns, Michael ; Münnich, Karl Otto ; [weitere]

Cambridge University Press

In: Radiocarbon. 1980; 22(2): 442-447. Published 1980 Jan 01. doi: 10.1017/s0033822200009747.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: A new 14C detector system containing nine, independently working, CO2 proportional counters is described. The system is designed for a sufficient measuring capacity at a precision level better than σ = ± 2‰, which requires a counting time of about one week per sample. The size of the installation requires a simple and economic design of counters and electronics. A single anticoincidence shield for all counters consists of five newly developed flat counters. The modern counting rate (52cpm) is sensitively checked by running Heidelberg sodium carbonate standard samples wth a counting rate of about 10 times modern. A microcomputer (DEC PDP-11 /03) is used for data acquisition. Recent developments in laboratory techniques (preparation and gaschromatographic purification of samples) are also reported.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

65

Unbekannt

Radiocarbon Dating of Pleistocene Bone: Toward Criteria for the Selection of Samples (1980)

Taylor, R E

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 969-979. Published 1980 Jan 01. doi: 10.1017/s0033822200010390.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: Amino acid composition data and stable isotope ratios (14N, D, and13C) are being evaluated as sources of information to indicate the presence of non-indigenous organics in bone samples intended for 14C analyses. The study is being conducted in the context of the planned measurement of Pleistocene bone samples by a high energy mass spectrometric 14C detection system.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

66

Unbekannt

Variations of 14C in Oats Grown from 1957 to 1978 in Quebec (1980)

Barrette, Louis ; Lasalle, Pierre ; Martel, Yvon ; [weitere]

Cambridge University Press

In: Radiocarbon. 1980; 22(2): 410-414. Published 1980 Jan 01. doi: 10.1017/s003382220000970x.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: Annual atmospheric radiocarbon concentrations for the year 1957 to 1978 are measured through oat seeds grown in the rural region of La Pocatière, Québec (70° W, 47° N). Results follow the general pattern of other curves obtained from grains elsewhere in the northern hemisphere. Some disagreements suggest a non-uniform mixing process with faster response to stratospheric contamination in definite regions.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

67

Unbekannt

Recalibration of Heidelberg 14C Laboratory Data (1984)

Kromer, Bernd

Cambridge University Press

In: Radiocarbon. 1984; 26(1): 148-148. Published 1984 Jan 01. doi: 10.1017/s0033822200006500.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: A sodium bicarbonate solution with a 10-fold activity compared to oxalic acid is used as a secondary standard in the Heidelberg 14C Laboratory. All routine checks and counter tests are greatly facilitated because of the high activity of the solution.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

68

Unbekannt

14C Variations from Tasmanian Trees—Preliminary Results (1983)

McPhail, Steve ; Barbetti, Mike ; Francey, Roger ; [weitere]

Cambridge University Press

In: Radiocarbon. 1983; 25(3): 797-802. Published 1983 Jan 01. doi: 10.1017/s0033822200006202.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: Huon pine is endemic to Tasmania. It has well-defined annual rings, may live for over 2000 years, and is particularly resistant to decay. Celery-top pine has similar characteristics and may live for 800 years. As part of a multi-disciplinary study of these trees and their habitat, a simple wood pretreatment method for isotope analysis is described. The solvent-acid-alkali-acid sequence yields a value of Δ14C = −16 ± 6‰ for AD 1941–45 Huon pine heartwood; Δ14C for extracts containing various proportions of post-AD 1955 carbon are also presented. Δ14C measurements on super-canopy and sub-canopy leaves from Celery-top pines are compared and used to place an upper limit of 10% on the amount of sub-canopy CO2 assimilated by sapling leaves, originating from decaying litter-mass. 14C ages from well-preserved logs illustrate the potential for a continuous Holocene chronology from 7400 years BP to the present. A 12,000-year-old Celery-top log has also been found.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

69

Unbekannt

University of Wisconsin Radiocarbon Dates XX (1983)

Steventon, Raymond L ; Kutzbach, John E

Cambridge University Press

In: Radiocarbon. 1983; 25(1): 152-168. Published 1983 Jan 01. doi: 10.1017/s0033822200005348.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: Procedures and equipment have been described in previous date lists. Except as otherwise indicated, wood, charcoal, and peat samples are pretreated with dilute NaOH–Na4P2O7 and dilute H3PO4 before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous materials are treated with HCl instead of H3PO4. Pretreatment of bone varies with the condition of the bone sample; solid bone with little deterioration is first cleaned manually and ultrasonically. The bone is treated with 8% HCl for 15 minutes, then dilute NaOH–Na4P2O7 for 3 hours at room temperature, washed until neutral, and the collagen extracted according to Longin (1971). Charred bone is treated with dilute HCl, NaOH–Na4P2O7, and then dilute HCl again.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

70

Unbekannt

Solar Modulation Effects in Terrestrial Production of Carbon-14 (1983)

Castagnoli, Giuliana ; Lal, Devendra

Cambridge University Press

In: Radiocarbon. 1983; 25(1): 169-169. Published 1983 Jan 01. doi: 10.1017/s003382220000535x.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

71

Unbekannt

University of Wisconsin Radiocarbon Dates XXI (1984)

Steventon, Raymond L ; Kutzbach, John E

Cambridge University Press

In: Radiocarbon. 1984; 26(1): 135-147. Published 1984 Jan 01. doi: 10.1017/s0033822200006494.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1984-01-01

Beschreibung: Procedures and equipment used in the University of Wisconsin laboratory have been described in previous date lists. Except as otherwise indicated, wood, charcoal, and peat samples are pretreated with dilute NaOH-Na4P2O7 and dilute H3PO4 before conversion to the counting gas methane; marls and lake cores are treated with acid only. Very calcareous materials are treated with HCl instead of H3PO4. Pretreatment of bone varies with the condition of the bone sample; solid bone with little deterioration is first cleaned manually and ultrasonically. The bone is treated with 8% HCl for 15 minutes, then dilute NaOH-Na4P2O7 for 3 hours at room temperature, washed until neutral, and the collagen extracted according to Longin (1971). Charred bone is treated with dilute HCl, NaOH-Na4P2O7, and then dilute HCl again.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

72

Unbekannt

Atmospheric Radiocarbon: Implications for the Geomagnetic Dipole Moment (1983)

Sternberg, R S ; Damon, P E

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 239-248. Published 1983 Jan 01. doi: 10.1017/s0033822200005531.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: The geomagnetic field is one of the major physical fields of the earth. Because its source is fluid motion in the outer core, it exhibits temporal changes, called secular variation, which are quite rapid compared to most geologic phenomena. The prehistoric secular variation is usually inferred from paleomagnetic data. We will discuss here how changes in the atmospheric 14C content can be used to gain additional insight into the behavior of the dipole moment over the past 8500 years. By rewriting the differential equations representing the 14C geochemical cycle in finite-difference form, we are able to convert the atmospheric 14C activity record into an equivalent radiocarbon dipole moment.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

73

Unbekannt

Rudjer Bošković Institute Radiocarbon Measurements VI (1981)

Srdoč, Dušan ; Sliepčevic, Adela ; Obelic, Bogomil ; [weitere]

Cambridge University Press

In: Radiocarbon. 1981; 23(3): 410-421. Published 1981 Jan 01. doi: 10.1017/s0033822200037802.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1981-01-01

Beschreibung: The following radiocarbon date list contains dates of samples measured since our previous list (R, 1979, v 21, p 131-137). As before, age calculations are based on the Libby half-life 5570 ± 30 yr and reported in years before 1950. The modern standard is 0.95 of the activity of NBS oxalic acid. Sample pretreatment, combustion, and counting technique are essentially the same as described in R, 1971, v 13, p 135-140, supplemented by new techniques for groundwater processing (R, 1979, v 21, p 131-137) and for soil sample treatment (R, 1977, v 19, p 465-475).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

74

Unbekannt

Udine Radiocarbon Laboratory Date List I (1982)

Barbina, Valerio ; Calligaris, Franco ; del Fabbro, Adriano ; [weitere]

Cambridge University Press

In: Radiocarbon. 1982; 24(2): 214-216. Published 1982 Jan 01. doi: 10.1017/s0033822200005051.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1982-01-01

Beschreibung: The radiocarbon laboratory of the Center of Applied Research and Documentation of Udine (CRAD), became operative early in 1977 and uses a benzene liquid scintillation counting method. Benzene is prepared as outlined by Legers and Tamers (1963), Noakes, Kim, and Akers (1967), Belluomini et al (1978). The procedure of chemical synthesis is detailed in CRAD (1977).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

75

Unbekannt

University of Pennsylvania Radiocarbon Dates Xxi (1981)

Meulengracht, Anne ; McGovern, Patrick ; Lawn, Barbara

Cambridge University Press

In: Radiocarbon. 1981; 23(2): 227-240. Published 1981 Jan 01. doi: 10.1017/s0033822200037620.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1981-01-01

Beschreibung: This date list includes most of the archaeologic and geologic samples dated in this laboratory since publication of our last date list (R, 1978, v 20, p 210–233), as well as some samples dated previously which lacked adequate sample information.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

76

Unbekannt

High Precision Radiocarbon Dating by Liquid Scintillation Counting Applied to Radiocarbon Time-Scale Calibration (1980)

Pearson, Gordon W

Cambridge University Press

In: Radiocarbon. 1980; 22(2): 337-345. Published 1980 Jan 01. doi: 10.1017/s0033822200009632.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: The precision quoted on a radiocarbon date is often misleading. Improvement in the accuracy of measurement is discussed together with the use of appropriate precisions. The effect of high accuracy in 14C dating and meaningful precisions are illustrated and applied to radiocarbon time-scale calibration. Intercomparison of such calibrations reveals a significant continuous saw-tooth pattern of short-term periodicity.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

77

Unbekannt

Radiometric Dating with the University of Washington Tandem Van De Graaff Accelerator (1980)

Farwell, G W ; Schaad, T P ; Schmidt, F H ; [weitere]

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 838-849. Published 1980 Jan 01. doi: 10.1017/s0033822200010225.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: The University of Washington Model FN tandem Van de Graaff accelerator is being used for the measurement of extremely small isotopic abundance ratios, notably 14C/12C and 10Be/9Be, in a joint project of the Nuclear Physics Laboratory (NPL) and the Quaternary Isotope Laboratory (QL). The experimental arrangements and technical developments are described, and some preliminary results on isotopic ratios in carbon and beryllium are presented.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

78

Unbekannt

The Use of Radiocarbon to Measure the Effects of Earthworms On Soil Development (1980)

Stout, J D ; Goh, K M

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 892-896. Published 1980 Jan 01. doi: 10.1017/s0033822200010298.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: Δ14C and δ13C values for organic matter in forest and grassland soils, in the presence or absence of earthworms, indicate that it should be possible to quantify the effects of earthworms on soil organic matter by this means. Without earthworms, both in forest and grassland soils, plant debris tends to accumulate on the surface of the mineral soil and little organic matter is incorporated into or is translocated down the soil profile. Where earthworms are present, there is much more marked incorporation of fresh plant debris in the mineral soil. This is shown especially by the pulse of ‘bomb’ carbon and also by the δ13C values.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

79

Unbekannt

Carbon Isotope Measurement as An Index of Soil Development (1980)

Ladyman, S J ; Harkness, D D

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 885-891. Published 1980 Jan 01. doi: 10.1017/s0033822200010286.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: 14C and 13C enrichment values are reported for a series of surface soil profiles which represent the progressive transition from mor to mull humus induced by birch (Betula pendula) colonization.Variations in Δ and δ13C, which range between 85 to 154‰ modern and −28.1 to −25.3‰ (PDB), respectively, reflect changes in the rate and mode of organic decomposition. The most marked alterations in soil character occur over the first few decades following the introduction of birch, with clear isotopic evidence for the deeper penetration and accelerated mineralization of organic material.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

80

Unbekannt

University of Granada Radiocarbon Dates I (1982)

González-Gómez, Cecilio ; de D López-González, Juan ; Domingo-García, María

Cambridge University Press

In: Radiocarbon. 1982; 24(2): 217-221. Published 1982 Jan 01. doi: 10.1017/s0033822200005063.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1982-01-01

Beschreibung: The Radiocarbon Dating Laboratory of The Granada University was established to support the work of archaeologists and geologists. The method of dating is benzene synthesis and liquid scintillation counting developed by a number of investigators (Polach and Stipp, 1967; Tamers, 1969; Pietig and Scharpenseel, 1966) with sample combustion in pure oxygen (Switsur, 1974).

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

81

Unbekannt

Natural Radiocarbon Variations from AD 200 to 800 (1980)

Bruns, Michael ; Münnich, K O ; Becker, Bernd

Cambridge University Press

In: Radiocarbon. 1980; 22(2): 273-277. Published 1980 Jan 01. doi: 10.1017/s0033822200009553.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: High precision radiocarbon measurements (±2.5‰ STD) were carried out on absolutely dated European oak material. These showed that significant short-term atmospheric 14C variations of up to 2 percent occurred between AD 200 and 800. These changes, reflecting a 150-to 180-year periodicity, seem to correlate with the average sunspot activity around that time. In comparison with results obtained by other authors, a very regular pattern of natural atmospheric 14C variations is exhibited.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

82

Unbekannt

Progress in Radiocarbon Dating with the Chalk River MP Tandem Accelerator (1980)

Andrews, H R ; Ball, G C ; Brown, R M ; [weitere]

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 822-829. Published 1980 Jan 01. doi: 10.1017/s0033822200010201.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: The evolution of a tandem accelerator 14C dating system at Chalk River is recounted. Background problems and sources of instability are discussed and solutions are described. Details of sample chemistry and source preparation are presented.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

83

Unbekannt

Marine Resources Research Institute Radiocarbon Dates III (1981)

Mathews, Thomas D

Cambridge University Press

In: Radiocarbon. 1981; 23(2): 218-221. Published 1981 Jan 01. doi: 10.1017/s0033822200037607.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1981-01-01

Beschreibung: Samples in this paper are a continuation of the Florida geologic samples, reported earlier (R, 1978, v 20, p 436–440). Each specimen analyzed in this list was a carbonate shell. All dates are from single shells as opposed to means of multiple shell samples.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

84

Unbekannt

Us National Committee for Inqua Announces Travel Support Program for XI Inqua Congress in USSR (1981)

Cambridge University Press

In: Radiocarbon. 1981; 23(3): vi-vi. Published 1981 Jan 01. doi: 10.1017/s0033822200037735.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1981-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

85

Unbekannt

Radiocarbon Updates (1994)

Cambridge University Press

In: Radiocarbon. 1994; 36(2): 325-326. Published 1994 Jan 01. doi: 10.1017/s0033822200040583.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1994-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

86

Unbekannt

Chronology of the Baxie Loess Profile and the History of Monsoon Climates in China Between 17,000 and 6000 Years BP (1992)

Zhou, Weijian ; An, Zhisheng ; Lin, Benhai ; [weitere]

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 818-825. Published 1992 Jan 01. doi: 10.1017/s0033822200064122.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: The valley of the Baxie River, situated in the western region of the Loess Plateau in central China, contains a loess profile 15 m thick, which can be considered representative of loess-paleosol sequences formed over the last 17 ka. Both thermoluminescence (TL) determinations on fine-grained sediment (4–11 μm) and 14C determinations on various organic fractions of paleosols from the profile have provided an extremely useful chronological framework for these sequences. These sequences indicate a weakened summer monsoon during the last glacial maximum followed by a strengthening of the summer monsoon, beginning ca. 13 ka cal bp. An abrupt change to a weakened summer monsoon regime lasted from ca. 10.9 to 10.2 ka cal bp. The Asian summer monsoon circulation, recording the Holocene optimum, then increased and lasted from ca. 10.2 to 6 ka cal bp. The organic component of samples taken down the profile has δ13C values ranging from −21 to −24‰ with respect to the PDB standard. The more positive δ13C values suggest that the proportion of C4-type plants in river valleys of the Loess Plateau increased as Asian summer monsoon influence weakened, and C3-type vegetation increased as the summer monsoon influence strengthened. Magnetic susceptibility and organic content were low during loess deposition, also reflecting weakening of summer monsoon. Two 14C determinations on the humin fraction of the organic component near the top of the lower paleosol and the base of the upper paleosol complex gave ages of 10.2 and 10.9 ka cal BP, respectively. These ages mark the beginning and termination of a brief event involving increased dust influx under weakened summer monsoon conditions.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

87

Unbekannt

Subject Index - Volume 36, 1994 (1994)

Cambridge University Press

In: Radiocarbon. 1994; 36(3): 443-444. Published 1994 Jan 01. doi: 10.1017/s0033822200014624.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1994-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

88

Unbekannt

14C in Austrian Wine and Vinegar (1992)

Schönhofer, Franz

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 768-771. Published 1992 Jan 01. doi: 10.1017/s0033822200064067.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: I analyzed wine from the vicinity of Vienna for 14C and 3H, using an ultra-low-level liquid scintillation counter. A series of certified samples from 1955 to 1987 was used to establish a calibration curve, which was applied successfully to a sample of apricot brandy. I used a simple extraction method to isolate acetic acid from vinegar, which I measured directly after mixture with a scintillation cocktail. A sample labeled as manufactured from wine contained too high a concentration of 14C, and thus may have been adulterated. Analytical- and technical-grade acetic acid also showed different concentrations of 14C, although it is unlikely that they are produced from organic material.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

89

Unbekannt

Laboratories1,2 (1994)

Cambridge University Press

In: Radiocarbon. 1994; 36(3): 417-440. Published 1994 Jan 01. doi: 10.1017/s0033822200014600.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1994-01-01

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

90

Unbekannt

Possible Effects of Ozone Depletion on the Global Carbon Cycle (1992)

Peng, Tsung-Hung

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 772-779. Published 1992 Jan 01. doi: 10.1017/s0033822200064079.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: The increase of UV-B radiation resulting from ozone depletion is considered to have damaging effects on marine ecosystems. A cutback of marine productivity would tend to reduce the oceanic uptake of atmospheric CO2. Box models of the global oceans based on the distribution of bomb-produced 14C are used to evaluate the possible effects of ozone depletion on the atmospheric CO2 concentration. The maximum effect presumably takes place if the ozone hole reduces the marine productivity to zero in the Antarctic Ocean. In a business-as-usual scenario of future CO2 emissions, the atmospheric CO2 partial pressure (pCO2) would increase by an additional 37 μatm over the course of the next century. This increase corresponds to 4.6% of the projected atmospheric pCO2 in the year 2090. However, if the damaging effect caused by the destruction of the stratospheric ozone layer is assumed to lower the productivity over the Antarctic Ocean by 10%, the atmospheric pCO2 would rise by less than 3 μatm over the expected atmospheric level in the next century.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

91

Unbekannt

14C and Other Parameters During the Younger Dryas Cold Phase (1980)

Oeschger, Hans ; Welten, Max ; Eicher, Ulrich ; [weitere]

Cambridge University Press

In: Radiocarbon. 1980; 22(2): 299-310. Published 1980 Jan 01. doi: 10.1017/s0033822200009590.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: Pollen analysis as well as 18O/16O results on lake marl show that the Younger Dryas climatic period, between about 11,000 and 10,300 bp, was the last vigorous cold phase of the Würm Glacial. Detailed 14C analyses from a peat bog near Wachseldorn (Switzerland) point to a 14C anomaly in this period. Further indication of a 14C anomaly is given by the observation that, during the Younger Dryas period, the sedimentation rates in several lakes apparently were higher than in adjacent periods; an explanation might be that the 14C time scale was compressed between 11,000 and 10,000 bp, ie, the atmospheric 14C/C ratio varied. If real, this suggested 14C variation would probably be connected to the climatic events during this transition period from Later Glacial to Postglacial.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

92

Unbekannt

US Geological Survey, Menlo Park, California, Radiocarbon Measurements II (1981)

Robinson, Stephen W ; Trimble, Deborah A

Cambridge University Press

In: Radiocarbon. 1981; 23(2): 305-321. Published 1981 Jan 01. doi: 10.1017/s0033822200037656.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1981-01-01

Beschreibung: The Menlo Park radiocarbon laboratory of the US Geological Survey began operation in January 1976 in a new building with a counting room 9.8m below the ground surface. Shielding above the counters consists of 30cm lead and 8.2m earth. The ionizing cosmic ray flux at the counters is 0.28 cpm/cm2. Background levels obtained thus far are summarized in Table 1.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

93

Unbekannt

Fractionation Corrections in Radiocarbon Dating (1981)

Wigley, T M L ; Muller, A B

Cambridge University Press

In: Radiocarbon. 1981; 23(2): 173-190. Published 1981 Jan 01. doi: 10.1017/s0033822200037589.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1981-01-01

Beschreibung: Recent experimental work has suggested that the relative fractionation of 14C to 13C may differ from the accepted value of b = 2. In order to explore the implications of this possibility, the standard formulae for correcting radiocarbon dates for fractionation effects are rederived, but without making any of the usual assumptions or approximations. A generalized dating equation is derived (where ASN and AON are normalized sample and standard activities, β is a factor which reflects changes in atmospheric 13C and 14C content, {RST(o)/RST}b accounts for post-depositional changes in sample 13C ratio, and tcal is calendar age in years before ad 1950. The errors in calculated ages which might arise from different b values are estimated and shown to be small relative to other dating uncertainties. The effect of b ≠ 2 may be important in the calibration of radiocarbon dates using tree-ring samples of known age. A theoretical analysis suggests that b ≠ 2 effects may result in a correlation between age anomaly (ie, the difference between radiocarbon age and calendar age) and sample 13C data. However, an analysis of published data reveals no meaningful correlation. This result, while not eliminating the possibility that b ≠ 2, highlights its unimportance even in this high-precision application of radiocarbon dating.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

94

Unbekannt

The Effect of Anthropogenic CO2 and 14C Sources on the Distribution of 14C in the Atmosphere (1980)

Levin, Ingeborg ; Münnich, K O ; Weiss, Wolfgang

Cambridge University Press

In: Radiocarbon. 1980; 22(2): 379-391. Published 1980 Jan 01. doi: 10.1017/s003382220000967x.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: 14C measurements on continuous weekly samples of atmospheric CO2 and hydrocarbons, collected in a rather densely populated area are presented. The deviation of the measured 14C data from the clean air level is primarily due to CO2 from the combustion of fossil fuels. This is confirmed by fossil fuel admixture estimates individually calculated with an atmospheric dispersion model. Up to 10 percent admixture is predicted by this model and observed from the 14C shift for weekly averages, particularly during the winter season. Natural CO2 admixture due to soil respiration, however, even in winter, is of the same order of magnitude, but much larger in the warm season: the considerable variations in CO2 concentration in summer are almost exclusively controlled by natural sources. Using tree leaf samples, we have been able to identify boiling water reactors (BWR) as weak sources of 14CO2. Atmospheric samples taken in the environment of the pressurized water reactors (PWR) Biblis show that the 14C release of these reactors is primarily in the form of hydrocarbon 14C. The source strength of the various power plants, calculated on the basis of our observations in their environment, ranges from 0.5 to 7Ci per year.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

95

Unbekannt

Radiocarbon Dating with Tandem Electrostatic Accelerators (1980)

Gove, H E ; Elmore, David ; Ferraro, R D ; [weitere]

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 785-793. Published 1980 Jan 01. doi: 10.1017/s003382220001016x.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: An MP tandem Van de Graaff accelerator at the University of Rochester has been employed since May 1977 to detect 14C in various terrestrial samples. The carbon sample sizes required are 1mg or less. Dating accuracies based on reproducibility now approach (± 80 years). Measurements have been made on 1850 wood, Australian sucrose, a carbon sample from Mt Shasta, a baby woolly mammoth, and an Egyptian bull mummy wrapping.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

96

Unbekannt

Carbon-14 and Carbon-13 in Soil Co2 (1980)

Dörr, Helmut ; Münnich, Karl Otto

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 909-918. Published 1980 Jan 01. doi: 10.1017/s0033822200010316.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: Carbon isotope measurements in soil CO2 are presented and discussed. Soil CO2 concentration and 13C profiles were measured using a new technique. A simple model describing the CO2 transport from the soil to the atmosphere is derived. The finding that CO2 in the soil is richer in 13C than the CO2 leaving the soil is attributed to isotopic fractionation in molecular diffusion.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

97

Unbekannt

Radiocarbon Dating of Ceramic Materials: Progress and Prospects (1980)

De Atley, Suzanne P

Cambridge University Press

In: Radiocarbon. 1980; 22(3): 987-993. Published 1980 Jan 01. doi: 10.1017/s0033822200010419.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1980-01-01

Beschreibung: Although initial studies in the 1960's established the feasibility of applying the radiocarbon technique directly to ceramics, subsequent analyses have revealed this category of materials to be more complex than previously believed. Consideration of the points at which various types of organic carbon are introduced into ceramic materials by natural or human agencies allows more effective screening of potential sherd samples. It also suggest ways to overcome some of the limiting factors involved in dating ceramics.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

98

Unbekannt

Distribution of Gaseous 12CO2, 13CO2, and 14CO2 in the Sub-Soil Unsaturated Zone of the Western US Great Plains (1983)

Thorstenson, D C ; Weeks, E P ; Haas, Herbert ; [weitere]

Cambridge University Press

In: Radiocarbon. 1983; 25(2): 315-346. Published 1983 Jan 01. doi: 10.1017/s0033822200005622.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1983-01-01

Beschreibung: Data on the depth distribution of the major atmospheric gases and the abundance of gaseous 12CO2, 13CO2, and 14CO2 in the subsoil unsaturated zone have been obtained from several sites in the western Great Plains of the United States. Sample profiles range from land surface to depths of 50m. Although each site must be considered on an individual basis, several general statements can be made regarding the profiles. 1) Diffusion of these gaseous molecules through the unsaturated zone is an important transport mechanism. 2) As predicted by diffusion theory, depth profiles of the various isotopic species of CO2 differ substantially from one another, depending on individual sources and sinks such as root respiration and oxidation of organic carbon at depth. 3) In general, post-bomb (〉 100% modern) 14C activities are not observed in the deep unsaturated zone, in contrast to diffusion model predictions. 4) In spite of generally decreasing 14C activities with depth, absolute partial pressures of 14CO2 in the subsoil unsaturated zone are 1–2 orders of magnitude higher than the partial pressure of 14CO2 in the atmosphere.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

AKTUELLE ARTIKEL

S·F·X

Volltext

99

Unbekannt

Geochronologic and Paleoclimatic Characterization of Quaternary Sediments in the Great Hungarian Plain (1992)

Hertelendi, Ede ; Sümegi, Pål ; Szöör, Gyula

Cambridge University Press

In: Radiocarbon. 1992; 34(3): 833-839. Published 1992 Jan 01. doi: 10.1017/s0033822200064146.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 1992-01-01

Beschreibung: We reconstructed the climate of the Great Hungarian Plain between the years, 7–32 ka BP using a malacothermometer method. The reconstruction is based on seven Gastropoda taxa, for which optimal temperature and tolerance ranges have been determined. The temporal scales of the malacofaunal levels were calibrated with radiocarbon data. We compared our paleotemperature values with the temperature values of existing climatic curves and found the same climatic periods.

Print ISSN: 0033-8222

Digitale ISSN: 1945-5755

Thema: Klassische Archäologie , Energietechnik , Geologie und Paläontologie

Publiziert von Cambridge University Press

Permalink