Abstract
IN his two interesting letters published in NATURE of September 26 and October 10 respectively, Dr. Boltwood states that he has obtained undoubted proof of the existence of the parent substance of radium, and that he finds it to be allied in chemical properties with thorium. I may be permitted to describe some experiments which afford independent evidence that the parent substance of radium possesses in a chemical sense the properties of thorium, and that it occurs with the latter.
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HAHN, O. The Origin of Radium. Nature 77, 30–31 (1907). https://doi.org/10.1038/077030c0
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DOI: https://doi.org/10.1038/077030c0
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