A mass spectrograph is described with which a study of the isotopic constitution of argon, potassium, rubidium, zinc and cadmium has been made. A calculation is carried out which indicates that the radioactivity of potassium and rubidium can best be explained by assuming that it is K⁴⁰ in the case of potassium and Rb⁸⁷ in the case of rubidium which is undergoing decay.
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A. O. Nier (1936) studied this question.
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