Abstract
THE elements 81 (thallium), 82 (lead), and 83 (bismuth) have both radioactive and inactive isotopes, whereas the elements 84–92 are only known in an active form. Several attempts have been made to find inactive isotopes of the latter elements. Aston, using his mass spectrograph, tried to discover a stable isotope of radon in the atmosphere, and Hahn made extensive researches to find an inactive isotope of radium. All these attempts failed.
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HEVESY, G., GUENTHER, A. Search for an Inactive Isotope of the Element 84 (Polonium). Nature 125, 744 (1930). https://doi.org/10.1038/125744b0
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DOI: https://doi.org/10.1038/125744b0
