Non-destructive measurements of cosmogenic 26Al, natural 40K and fallout 137Cs in Antarctic meteorites

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 assum...

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Bibliographic Details
Main Authors: Kazuhisa Komura, Masaki Tsukamoto, Masanobu Sakanoue
Format: Report
Language:English
Published: Low Level Radioactivity Lavoratory, Kanazawa University 1982
Subjects:
Allan Hills
Antarctic
The Antarctic
Yamato
Antarc*
Memoirs of National Institute of Polar Research
Polar Research
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1389
http://id.nii.ac.jp/1291/00001389/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1389&item_no=1&attribute_id=18&file_no=1
Description
Summary: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.

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