Conclusions
Passive observation of the naturally occurring γ-ray and X-ray from the planets is potentially an important technique for determining their gross chemical composition and on the basis of natural γ-radiation determining if the planetary surface is composed of differential material. If the planet is not covered by a thick atmosphere then it is possible to map the distribution of the most abundant elements on a scale of spatial resolution that is of the order of the altitude at which the observations are made. Initial observations carried out from lunar orbit have shown that the flux levels are approximately as expected and that the lunar surface is not characterized by any widespread distribution of acidic rocks in the region observed by the Luna 10 spacecraft.
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Gorenstein, P., Gursky, H. Characteristic γ- and X-radiation in the planetary system. Space Sci Rev 10, 770–829 (1970). https://doi.org/10.1007/BF00167339
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DOI: https://doi.org/10.1007/BF00167339