Non-destructive measurements of cosmogenic 26Al, natural 40K and fallout 137Cs in Antarctic meteorites
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概要
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Non-destructive γ-ray measurements have been made to determine cosmogenic ^<26>(Al), natural ^<40>K and fallout ^<137>(Cs) activities in 15 Antarctic meteorites (14 from Yamato Mountains and 1 from Allan Hills). The ^<26>(Al) activities range from 72 to 29 dpm/kg. If we assume that the saturation activity of ^<26>(Al) in chondrites is 60,about 1/3 of the measured meteorites show the contents close to this value; however, the rest show lower values. A simple graphical method was applied to estimate the exposure and terrestrial ages based on ^<26>(Al) and ^<53>(Mn) data, and these ages are compared with exposure ages obtained by ^<21>(Ne) measurements. The results are generally consistent with the ^<21>(Ne) data. It must be noted that the Antarctic meteorites are highly contaminated with fallout ^<137>(Cs) derived from nuclear test explosions.
- 国立極地研究所の論文
著者
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Tsukamoto Masaki
Low Level Radioactivity Lavoratory Kanazawa University
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Komura Kazuhisa
Low Level Radioactivity Laboratory Kanazawa University
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Komura Kazuhisa
Low Level Radioactivity Lab. Kanazawa Univ.
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Sakanoue Masanobu
Low Level Radioactivity Laboratory, Kanazawa University
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Sakanoue Masanobu
Low Level Radioactivity Laboratory
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Komura Kazuhisa
Low Level Radioactivity Lavoratory Kanazawa University
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