Isotopic Abundances of Actinide Elements in Lunar Material

Details Isotopic Abundances of Actinide Elements in Lunar Material Isotopic Abundances of Actinide Elements in Lunar Material

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..499f&link_type=abstract

Science, Volume 167, Issue 3918, pp. 499-501

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Scientific paper

The abundances of uranium and thorium were measured mass spectrometrically as 0.59 ± 0.02 and 2.24 ± 0.06 parts per million, respectively, in the fines of Apollo 11 bulk sample. The ratio 235U/238U was 0.007258 ± 0.000016, in agreement with terrestrial uranium. The following upper limits were set: 236U/238U<= 3 × 10-9; parts per million of sample, 239Pu<= 1 × 10-9; 244Pu<= 9 × 10-11, and 247Cm <= 1.25 × 10-10. More alpha activity from 227Th and its decay products appears to be present than would be in equilibrium with the 235U in the sample. The search for other actinide and transactinide nuclides is continuing.

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