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By means of a high intensity mass spectrometer we have separated the three isotopes of potassium. Measurements of the radioactivity of the isotopic samples indicate that K⁴⁰ is radioactive. Comparison of the beta-particle emission from the isotopic samples and from KCl shows that K⁴⁰ is responsible for both of the known beta-ray bands.
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Smythe et al. (1937) studied this question.
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