Abstract
FERMI failed to detect induced β.radioactivity with calcium bombarded by neutrons, and this fact has been attributed1 to the existence of a closed neutron shell in the calcium nucleus. We suggest alternatively that the failure to detect radioactivity may constitute a proof that the source of the natural radioactivity of potassium is the isotope 10K40 of such small abundance that it cannot be detected by means of the mass-spectrograph.
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Wenli Ych, C.R., 199, 1209; 1934.
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NEWMAN, F., WALKE, H. Radioactivity of Potassium. Nature 135, 98 (1935). https://doi.org/10.1038/135098a0
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DOI: https://doi.org/10.1038/135098a0
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