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Radioactivity of the Lunar Surface

Hobart W. Kraner, Gerald L. Schroeder, Gilbert Davidson and Jack W. Carpenter
Science
New Series, Vol. 152, No. 3726 (May 27, 1966), pp. 1235-1236
Stable URL: http://www.jstor.org/stable/1718930
Page Count: 2
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Abstract

Diffusion of radon and thoron from the lunar surface provides a mechanism for production of a radioactive surface layer on the moon. If the radon and thoron flux from the lunar surface is equal to that measured at the earth's surface, the equilibrium activity of this surface layer is estimated as approximately 1 microcurie per square meter, due to radon and its decay products. This activity consists of alpha particles and gamma rays at well-defined energies and of beta rays.

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