Primordial Radioelements and Cosmogenic Radionuclides in Lunar Samples from Apollo 15

Details Primordial Radioelements and Cosmogenic Radionuclides in Lunar Samples from Apollo 15 Primordial Radioelements and Cosmogenic Radionuclides in Lunar Samples from Apollo 15

Jan 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972sci...175..440d&link_type=abstract

Science, Volume 175, Issue 4020, pp. 440-443

Computer Science

Scientific paper

Two basalts, two breccias, and two soils from Apollo 15 were analyzed by nondestructive gamma-ray spectrometry. The concentrations of potassium, thorium, and uranium in the basalts were similar to those in the Apollo 12 basalts, but the potassium: uranium ratios were somewhat higher. Primordial radioelements were enriched in the soils and breccia, consistent with a two-component mixture of mare basalt and up to 20 percent foreign component (KREEP). The abundance patterns for cosmogenic radionuclides implied surface sampling for all specimens. The galactic cosmic-ray production rate of vanadium-48 was determined as 57 ± 11 disintegrations per minute per kilogram of iron. Cobalt-56 concentrations were used to estimate the intensity of the solar flare of 25 January 1971.

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