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  • 1
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    Cosmogenic nuclides in core samples of the Chico L6 chondrite - Evidence for irradiation under high shielding (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Results are presented from an analysis of core samples obtained from different depths of the Chico (New Mexico) L6 chondrite for various cosmogenic nuclides (Be-10, Al-26, and stable isotopes of He, Ne, and Ar). The relationships between the measured abundances of cosmogenic nuclides and cosmogenic Ne-22/Ne-21 ratio were compared with predictions of recent semiempirical models of Graf et al. (1990) and Reedy (1991), and it was found that both models closely reproduce the observed trends and absolute values of the data obtained. Noble gas data indicate that Chico experienced shielding similar to that of Jilin and greater than those of the Knyahinya or the Keyes chondrites. The exposure history for Chico is discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 27; 4; p. 371-381.
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  • 2
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    Cosmogenic nuclides in extraterrestrial materials (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Research on cosmogenic nuclides in extraterrestrial materials is summarized. Methods for determining average production rates in meteorites are considered as well as the composition dependence of production rates. Also discussed are lunar meteorites, solar-gas-rich meteorites, presolar grains, and solar cosmic rays.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Reviews of Geophysics (ISSN 8755-1209); 28; 253-275
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  • 3
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    Recent cosmic ray exposure history of ALHA 81005 (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Measurements of the Be-10 and Al-26 contents of ALHA 81005 constrain the length and conditions of its exposure to cosmic rays. Calculations based on one-step irradition models imply that the time spent by this object in space is shorter than that spent by most 'asteroidal' meteorites. On the other hand the results are readily consistent with a lunar origin for ALHA 81005.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters (ISSN 0094-8276); 10; Sept
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  • 4
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    Diogenite exposure ages (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: He, Ne and Ar isotopes have been measured in six, and Al-26 in two diogenites. Cosmic-ray exposure ages corrected for shielding effects using Ne-22/Ne-21 ratios are generally concordant. Five diogenites have a group age of 14 Myr and three others may have a group age of 24 Myr, implying that two collisions may have produced 8 of the 9 diogenites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 41; Jan. 197
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  • 5
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    Al-26 losses from weathered chondrites (1976)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Analysis of Al-26 and noble gases were conducted in a study of samples of two heavily weathered meteorites. The analyses were performed in accordance with procedures described by Cressy (1970) and by Herzog and Cressy (1974). The analytic data are presented in tables. Evidence is presented which implicates weathering as the most probable cause of the observed variation of Al-26 and the rare gas contents.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics; 11; Mar. 31
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  • 6
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    The Ne-21 production rate in stony meteorites estimated from Be-10 and other radionuclides (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The Be-10 contents of 28 stony meteorites with known Ne-21 contents range from 0.97 to 23 dpm/kg and give an average Ne-21 production rate (P sub 21) of (0.28 + or - 0.02) x 10 to the -8th cu cm STP/g-My for shielding conditions corresponding to Ne-22/Ne-21 = 1.114 in an H-chondrite. This P sub 21 (Be) agrees with others' P sub 21 based on Na-22, Kr-81, and Mn-53, but not an Al-26. Temporal variations in the cosmic ray flux do not explain the disagreement satisfactorily; major errors in the radionuclide half-lives are not indicated. The discrepancy seems rooted in the data selection and the difficulties of making accurate corrections for shielding, chemical composition and other sources of variability.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 47; 1887-189
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  • 7
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    Beryllium-10 in Australasian tektites - Evidence for a sedimentary precursor (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Each of seven Australasian tektites contains about 100 micron atoms of beryllium-10 (half-life, 1.53 million years) per gram. Cosmic-ray bombardment of the australites cannot have produced the measured amounts of beryllium-10 either at the earth's surface or in space. The beryllium-10 contents of these australites are consistent with a sedimentary precursor that adsorbed from precipitation beryllium-10 produced in the atmosphere. The sediments must have spent several thousand years at the earth's surface within a few million years of the tektite-producing event.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 218; Nov. 19
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  • 8
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    Spallogenic Be-10 in the Jilin chondrite (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The Be-10 contents measured in eight bulk samples of the Jilin meteorite range from 5.05 + or - 0.55 to 16.3 + or - 1.7 dpm/kg, more than threefold, and correlate with the Ne-21 contents. A least-squares fit of these data has a positive intercept on the Be-10 axis which can be explained in terms of a two-stage irradiation. The second, more recent stage lasted 0.57 + or - 0.14 Myr. Model calculations give first-stage Be-10/Ne-21 age ranging from 6.2 to 7.1 Myr.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 72; 2-3; 273-275
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  • 9
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    Beryllium-10 contents of core samples from the St. Severin meteorite (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Beryllium-10 contents in the 20-28 dpm/kg range, averaging 24.5 + or - 0.9 dpm/kg, have been obtained for 11 samples taken from along the 35-cm core AIII of the St. Severin LL chondrite. Be-10 content increases with depth in the outermost 8 cm, and there is little change in content at greater depths. Significant disagreement is noted between the measured values and the results of calculations based on the cross sections for proton-induced Be-generating reactions. Cosmogenic Be-10 in stony meteorites is better described as a medium-energy product than a high energy one.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 48; 1867-187
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  • 10
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    Al-26 in stony meteorites with gas losses (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The Al-26 content of a group of stony meteorites with low levels of He-3 (implying outgassing caused by near approach to the sun) was analyzed in a test of the possible role of cosmic radiation in determining the radionuclide concentration of meteorites. The Al-26 contents of the meteorites with He-3 losses were found to be indistinguishable from the Al-26 contents of L- and H-chondrites. It is concluded that if the He-3 outgassing occurred near the sun, the flux of particles producing Al-26 must have been nearly normal, or the diffusion process must have taken place very rapidly.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 41; Oct. 197
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