Major and Trace Elements and Cosmic-Ray Produced Radioisotopes in Lunar Samples

Details Major and Trace Elements and Cosmic-Ray Produced Radioisotopes in Lunar Samples Major and Trace Elements and Cosmic-Ray Produced Radioisotopes in Lunar Samples

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..523w&link_type=abstract

Science, Volume 167, Issue 3918, pp. 523-525

Computer Science

2

Scientific paper

Analytical data for 42 major and trace elements were mostly obtained by a combination of instrumental and radiochemical neutron activation analyses using both thermal and 14-million-electronvolt neutrons. Excesses of nitrogen and chlorine in the fines, compared with the rocks, are attributed to the solar wind. A striking similarity for contents of seven elements in lunar metal and metal from the calcium-rich achondrite Juvinas was noted. Fractional dissolution was used to separate five radionuclides produced by cosmic-ray bombardment in the fines and rock 57-40. Results for argon-39 from the reaction potassium-39 (n,p), and for argon-37, from the reaction calcium-40 (n,α ), seem to require a neutron spectrum containing more neutrons below 2 million electronvolts than the evaporation spectrum or that given by Arnold, Honda, and Lal (1) or a strong time dependence for the neutron flux.

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