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Science 17 October 1969:
Vol. 166. no. 3903, pp. 370 - 372
DOI: 10.1126/science.166.3903.370
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Articles

Alpha-Particle Emissivity of the Moon: An Observed Upper Limit

Richard S. Yeh 1 and James A. Van Allen 1

1 Department of Physics and Astronomy, University of Iowa, Iowa City 52240

Measurements made by the moon-orbiting spacecraft Explorer 35 during 1967-1968 show that it is unlikely that the alpha-particle emissivity of the moon is greater than 0.064 per square centimeter per second per steradian and exceedingly unlikely that it is greater than 0.128, these values being respectively 0.1 and 0.2 of the provisional estimates made by Kraner et al. in 1966. This result implies that the abundance of uranium-238 in the outer crust (approximately a few meters thick) of the moon is much less than that typical of the earth's lithosphere, though it is consistent with the abundance of uranium-238 in terrestrial basalt or in chondritic meteorites.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Detection of Radon Emanation from the Crater Aristarchus by the Apollo 15 Alpha Particle Spectrometer.
P. Gorenstein, P. Gorenstein, and P. Bjorkholm (1973)
Science 179, 792-794
   Abstract »    PDF »
Alpha Radioactivity of the Lunar Surface at the Landing Sites of Surveyors 5,6, and 7.
A. L. Turkevich, A. L. Turkevich, J. H. Patterson, E. J. Franzgrote, K. P. Sowinski, and T. E. Economou (1970)
Science 167, 1722-1724
   Abstract »    PDF »


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