Other
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..703h&link_type=abstract
(Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986)
Other
9
Aluminum 26, Chondrites, Meteoritic Composition, Thermoluminescence, Antarctic Regions, Shock Heating
Scientific paper
The levels of natural thermoluminescence (TL) were measured in thirty specimens (removed under red light) from 23 Antarctic meteorites of known Al-26 content to explore their thermal and radiation history. Of the 23 samples, 17 showed evidence for a correlation between natural TL and Al-26: samples with Al-26 activities of 45-60 dpm/kg had TL ratios of 2-4, those with Al-26 of 30-45 dpm/kg had TL ratios of 1-2 , while a sample with an Al-26 content of 11 dpm/kg had a TL value of 0.87. The results suggest that the 'half-life' for TL decay is comparable to that of Al-26 and that, for these 17 meteorites, natural TL levels at the time of their fall, and terrestrial storage conditions were similar. The six meteorites not lying on the TL-Al-26 trend have much lower TL than others of comparable Al-26. Three of these have suffered a recent reheating, and two probably reflect a recent severe shock.
Haq Munir
Hasan Fouad A.
Sears Derek W. G.
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