Computer Science
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982polre..25..178k&link_type=abstract
(Symposium on Antarctic Meteorites, 7th, Tokyo, Japan, Feb. 19, 20, 1982) National Institute of Polar Research, Memoirs, Special
Computer Science
1
Meteorites, Antarctic Meteorites, Cosmogenic Elements, Aluminum 26, Isotopes, Potassium 40, Cesium 137?, Composition, Abundance, Laboratory Studies, Techniques, Samples, Meteorite
Scientific paper
Non-destructive gamma-ray measurements have been made to determine cosmogenic Al-26, natural K-40 and fallout Cs-137 activities in 15 Antarctic meteorites (14 from Yamato Mountains and 1 from Allan Hills). The Al-26 activities range from 72 to 29 dpm/kg. If it is assumed that the saturation activity of Al-26 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 Al-26 and Mn-53 data, and these ages are compared with exposure ages obtained by Ne-21 measurements. The results are generally consistent with the Ne-21 data. It must be noted that the Antarctic meteorites are highly contaminated with fallout Cs-137 derived from nuclear test explosions.
Komura Kazuhisa
Sakanoue M.
Tsukamoto Masaki
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