Detection of Radon Emanation from the Crater Aristarchus by the Apollo 15 Alpha Particle Spectrometer

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Science  23 Feb 1973:
Vol. 179, Issue 4075, pp. 792-794
DOI: 10.1126/science.179.4075.792


The alpha particle spectrometer aboard the Apollo 15 command/service module was designed to detect alpha particles from radon decay and to locate regions with unusual activity on the moon. A significant increase in radon-222 activity was detected from a region containing the crater Aristarchus. The result is interpreted as probably indicating internal activity at the site. By analogy with terrestrial processes, increased radon emanation may be associated with the emission of other volatiles.