Abstract
THE data of cosmogenic radionuclide activity measurements in lunar material from the Apollo 11 and 12 missions have now been published1–8. Unfortunately, the data concern chiefly the measurements of medium radioactivity of whole rock (by non-destructive gamma-spectrometry) or large volume samples (by radiochemical methods). The data provide no way to determine the overall depth distribution gradient of radionuclides, produced by galactic and solar cosmic rays, and so no information can be extracted about the intensity of cosmic rays. But ref. 1 describes how the radioactivities of some radionuclides have been measured as a function of depth in lunar sample 10,017. By analysing these data we have drawn a conclusion about possible constancy of solar proton medium flux for the last million years.
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LAVRUKHINA, A., USTINOVA, G. Solar Proton Medium Flux Constancy over a Million Years. Nature 232, 462–463 (1971). https://doi.org/10.1038/232462a0
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DOI: https://doi.org/10.1038/232462a0
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