Lead and Thallium Isotopes in Mare Tranquillitatis Surface Material

Details Lead and Thallium Isotopes in Mare Tranquillitatis Surface Material Lead and Thallium Isotopes in Mare Tranquillitatis Surface Material

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..481k&link_type=abstract

Science, Volume 167, Issue 3918, pp. 481-483

Computer Science

1

Scientific paper

Lead from Apollo 11 fines is more radiogenic than any meteoritic lead reported and older than any terrestrial radiogenic lead:204Pb/206Pb/207Pb/208Pb = 1/99.6/69.0/117.1. Comparison with primordial lead from meteoritic troilite yields a 207Pb/206Pb age of 4.7 ± 0.1 × 109 years. The 238U/204Pb ratio is gtrsim 90 and the 232Th/238U ratio is 3.9 ± 0.1. The lead content is gtrsim 1.7 × 10-6. Evidently Pb was strongly depleted and Th and U strongly enriched in the formation of this material. Thallium was too low (lesssim 5 × 10-9) to yield mass spectra, but indications are favorable for eventual observation of extinct natural radioactivity of 205Pb.

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