Physics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pepi...14..289g&link_type=abstract
(NASA and Lunar Science Institute, Special Symposium on the Recent Activity in the Moon, Houston, Tex., Mar. 16, 1976.) Physics
Physics
4
Lunar Surface, Radon Isotopes, Alpha Particles, Apollo Flights, Cosmic Rays, Lunar Craters, Polar Orbits, Polonium 210, Radioactive Decay, Satellite Observation, Terminator Lines
Scientific paper
An interpretation of previously reported measurements of the Apollo 15/16 alpha-particle spectrometer on the distribution of Ru-222 and Po-210 across the lunar surface suggests that continuation of these measurements is a method of monitoring current activity on the moon. Since the two isotopes are relatively short-lived with effective half-lives of 3 days and 21 years, respectively, the activity detected has had to have been released during this current epoch. Changes in the rate of lunar emanation can be measured on three different time scales: (1) a few days or less by detecting Ru-222 at discrete sites such as the crater Aristarchus; (2) a month by measuring Ru-222 activity at the sunrise terminator; (3) a few years by measuring Po-210 activity at various locations. These observations could be carried out very effectively from a lunar polar orbiting satellite.
Bjorkholm P. J.
Gorenstein Paul
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