Physics
Scientific paper
Oct 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..983r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 27, Issue 10, pp.983-984
Physics
5
Scientific paper
The -ray spectra of 37 samples of 25 chondrites, 3 carbonaceous chondrites, and 9 achondrites have been investigated using a large NaI(Tl) scintillation spectrometer. An extensive set of measurements are presented here. Long lived K 40 and Al 26 were the predominant radioactivities detected; more unusual -ray emitters detected were 308-day Mn 54 , 2.6-year Na 22 , and probably a mixture of Sc 46 and Co 56+58 (half-lives approximately 80 days). These nuclides were detected in relatively recent falls (the youngest, the Harleton, Texas, chondrite was measured 21 days after fall). Furthermore, thorium was detected and measured in 5 of the 9 achondrites. The average potassium content in chondrites was found to be 0.081 per cent, in excellent agreement with Edwards and Urey. Chondritic potassium concentrations vary ±10 per cent from this average value. The average Al 26 concentration in stone meteorites was 245 ± 42 disintegrations/min/kg (silicon and aluminum). The variation from the mean of both potassium and Al 26 concentrations is real, not analytical.
Anderson Ernest C.
Rowe Marvin W.
van Dilla Marvin A.
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