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  • 1
    Electronic Resource
    Electronic Resource
    A Mössbauer study of samples from an oil well (1994)
    Springer
    Hyperfine interactions 83 (1994), S. 379-384 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Seven different samples obtained from the Petrobras Oil Well 1-ICA-1BA from depths down to 1872 m have been studied by Mössbauer spectroscopy, X-ray diffraction and neutron activation analysis. The X-ray diffraction showed the presence of clay minerals, feldspar, calcite, pyrite, quartz, dolomite, andrite and others. The neutron activation analysis has been used to obtain the iron concentration in the samples. The Mössbauer spectra were obtained both at room and liquid nitrogen temperatures. Spectra are complex in nature indicating multiple sites or mixture of iron containing minerals. The spectra at 85 K could be least squares fitted are resolved up to four doublets with typical values of IS(Fe)=1.4, 1.21, 1.16, 0.40 and QS=3.62, 2.82, 2.37, 0.61 mm/s respectively. They have slightly large line widths except for the first doublet. Two samples also showed the presence of hematite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02074303
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  • 2
    Electronic Resource
    Electronic Resource
    INAA of Trace Elements in Biological Materials Using the SLOWPOKE-2 Reactor in Jamaica (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 263-266 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The biological standard reference materials Orchard Leaves SRM 1571 and Oyster Tissue SRM 1566a was analysed by instrumental neutron activation analysis (INAA) at the International Centre for Environmental and Nuclear Sciences, Jamaica at (ICEN) and at the Instituto de Pesquisas Energeticas e Nucleares (IPEN-CNEN/SP), Brazil. The comparison of the results with those obtained with the more powerful reactor are used to evaluate the possibilities of INAA for the analysis of biological samples at ICENS. The detection limits, the precision and accuracy of the results obtained in both laboratories are compared. The advantages and disadvantages of the different irradiation facilities are discussed. Some results obtained for Jamaican biological samples are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006777929225
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  • 3
    Electronic Resource
    Electronic Resource
    A Comparison of INAA and High Performance Liquid Chromatography for the Determination of Rare Earth Elements in Geological Materials (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 615-618 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Procedures for the determination of traces of rare earth elements (REE) in geological samples by instrumental neutron activation analysis (INAA) and high resolution liquid chromatography (HPLC) are presented. The international standard reference materials AGV-1, GSP-1 and G-2 (USGS) were tested for the determination of REE concentrations using both techniques. The results obtained showed good agreement with certified values, giving relative errors less than 10%. By using INAA, the REE La, Ce, Nd, Sm, Eu, Tb, Yb and Lu were determined. All the REE, except Dy and Y, were determined when HPLC was employed. The application of INAA and HPLC to the determination of REE in geological samples is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006721518090
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  • 4
    Electronic Resource
    Electronic Resource
    NAA and UV Laser Ablation ICP-MS for Platinum Group Elements and Gold Determination in NiS Fire Assay Buttons: A Comparison between Two Methods (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 623-625 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract NAA and UV laser ablation ICP-MS were used to determine platinum group elements (PGEs) and gold in the geological reference materials UMT-1, WPR-1, WMG-1, GPT-4 and GPt-6, after NiS fire assay. Both methods presented results were good agreement with the recommended values. NAA gave more accurate values for Ir (relative errors between 0 to 9%) and UV-LA-ICP-MS presented better results for Pt (relative errors less than 12%, except for WPR-1). UV-LA-ICP-MS showed better sensitivity than NAA for Pd and Os. On the other hand, NAA showed lower detection limits for Ir and Au. Advantages and disadvantages of each method are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006725618998
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of yttrium and lanthanum in zirconium dioxide by HPLC, X-ray fluorescence and neutron activation analyses (1999)
    Springer
    Chromatographia 49 (1999), S. 91-94 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Zirconium oxide ceramics ; X-ray fluorescence ; Neutron activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Lanthania-and yttria-stabilized zirconium oxide ceramics have been examined using High Performance Liquid Chromatography (HPLC), thermal neutron activation (NA) and X-ray Fluorescence (XRF) analyses and thus determine the stabilizer content. Ceramic powders with the composition ZrO2:x mol % La2O3 (x=5, 10, 15, 20 and 33) and ZrO2:x mol % Y2O3 (x=10, 15, 20 and 25) were prepared by the citrate and the co-precipitation techniques, respectively. The lanthanum content was determined by HPLC (x=5.09, 9.78, 14.98, 19.81 and 25.94) and NA (x=5.15, 10.32, 17.25, 21.08 and 27.97) analyses, the yttrium content by HPLC (x=8.5, 13.5, 17.9 and 22.1) and XRF (x=9.9, 15.8, 20.1 and 24.9) analyses. An experimental sequence, based on continuous dilution of ceramic powder solutions, is proposed for preparing samples for HPLC measurements. A swimming pool nuclear reactor is used for NA analysis. The quantitative determinations of yttrium and lanthanum doping levels obtained using those techniques are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467194
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  • 6
    Electronic Resource
    Electronic Resource
    Application of the radioreagent method for trace determination of lead (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 88 (1985), S. 241-257 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A radioreagent method of analysis was developed and applied to the determination of trace quantities of lead in several types of samples. The method is based on the extraction of radioactive cobalt, displaced by lead from the cobalt chelate of ethylenediaminetetraacetate labelled with60Co, into a tetracycline-benzyl alcohol solution. The radioactivity of the released cobalt, extracted into the organic phase, is proportional to the lead concentration. Interference caused by some elements was eliminated by means of a previous separation of lead using dithizone. The method was applied for lead determination in aerosol samples, gasoline and samples from the International Atomic Energy Agency, namely: simulated-air filter (Air-3), fresh water (W-3), dried animal whole blood (A-2) and calcined animal bone (A-3/1). The sensitivity, accuracy and precision of the method were also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037001
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  • 7
    Electronic Resource
    Electronic Resource
    A comparative study of some nuclear methods for235U/238U isotopic ratios determination (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 113 (1987), S. 357-370 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In the present work, a comparative study is made among nuclear methods for235U/238U ratios determination: activation analysis followed by high-resolution gamma-ray spectrometry, delayed neutron counting, passive gamma-ray and alpha spectrometry. Activation analysis followed by high-resolution gamma-ray spectrometry yielded a relative standard deviation down to 0.1% and a relative error of about 1% for standards of uranium enriched to 14%. Passive gamma-ray spectrometry using Ge(Li) detectors yielded a relative error down to 0.1% for enriched uranium and values even lower for the standard deviation. Passive gamma-ray spectrometry using Low Energy Photon Detector (LEPD) yielded a precision of 0.2% and a still better accuracy for enriched standards. In the case of alpha spectrometry, a relative error down to 0.5% and a precision of about 1% were obtained, also for enriched uranium standards. Delayed neutron counting allowed a relative standard deviation of about 7% and a relative error of about 2%, for standards of depleted uranium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02050508
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of rare earth elements in the biological reference materials Pine Needles and Spruce Needles by neutron activation analysis (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 233 (1998), S. 59-61 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Instrumental neutron activation analysis was applied to determine La, Ce, Nd, Sm, Eu, Tb, Yb, Lu and Sc in two biological reference materials: NIST 1575 Pine Needles and BCR-CRM 101 Spruce Needles. The purpose was to contribute to the reference data for these two reference materials. The results were obtained with a good precision (relative standard deviations less than 15%). For the Pine Needles reference material there are already some proposed values and our results showed, in general, a good agreement with the data published. The contribution of uranium fission products to La, Ce, Nd and Sm was evaluated and considered in the determination of these elements. Interferences in the determination of rare earth elements in biological materials are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02389648
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of the Contents and Distribution Characteristics of Rare Earth Elements in Solanum lycocarpum from Tropical Ecosystems in Brazil by INAA (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 303-306 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We have determined the concentrations of eight REE elements by instrumental neutron activation analysis (INAA) (La, Ce, Nd, Sm, Eu, Tb, Yb, and Lu) in plant leaves of the species Solanum lycocarpum, a typical Brazilian "cerrado" plant widely distributed around the country, and in the soils in which they grow. Three different ecosystems were studied. Very similar chondrite normalized patterns were observed in the soil and in the plant, presenting an enrichment of the light REE, indicating a typical absorption of these elements by this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006798501000
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of Iridium at Sub ng·g−1 Levels in Geological Materials by RNAA (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 244 (2000), S. 619-621 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Radiochemical neutron activation method is presented for the determination of iridium in geological materials. The procedure consisted of thermal neutron irradiation of an 500 mg sample followed by sinterization with sodium peroxide, precipitation with tellurium and high resolution gamma-spectrometry with a hyper-pure Ge-detector. The procedure was evaluated by the analysis of the certified reference materials SARM-7 and W-1. The detection limit for the analytical conditions employed was 0.004 ng·g−1 Ir. The procedure was applied to the reference materials TDB-1 and WGB-1, which present provisional values for Ir concentration, and GXR-3, GXR-5 and GXR-6, which do not present any reported data for Ir contents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006773502160
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