NASA NTRS · 19730023163
Apollo orbital geochemistry: Gamma rays
Abstract
Lunar gamma ray spectra obtained during Apollo-15 and -16 flights show a natural radioactivity due to potassium, thorium, and uranium as well as a cosmic ray induced activity in the lunar surface due to high neutron interactions produced by (p,n) reaction in the lunar surface. The radioactivity is at a low in the highlands on the backside of the moon; most of the radioactivity is confined to the Oceanus Procellarum/Mare Imbrium region and to the Van de Graff area on the lunar backside.
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Trombka, J. I.. 1973-01-01. Apollo orbital geochemistry: Gamma rays. https://ntrs.nasa.gov/citations/19730023163
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