Abstract
IN 1903, it was shown by Mr. Soddy and myself that the spontaneous change of the emanation from radium results in the formation of helium; this observation has been confirmed by Indrikson, by Debierne, by Giesel, by Curie and Dewar, and by Himstedt and G. Meyer. Debierne has shown that actinium chloride and fluoride also develop helium. I have also once detected helium in the gases evolved continuously from a solution of thorium nitrate, and hope soon to confirm this observation.
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RAMSAY, W. Radium Emanation. Nature 76, 269 (1907). https://doi.org/10.1038/076269a0
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DOI: https://doi.org/10.1038/076269a0
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