Key step in atomic physics 100 years ago today

Discovery that radium produces helium ions paved way for nuclear energy exploitation.

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Ramsay, W. & Soddy, F. Experiments in radio-activity, and the production of helium from radium. Nature, 68, 354 - 355, (1903).
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Philip Ball
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Ball, P. Key step in atomic physics 100 years ago today. Nature (2003). https://doi.org/10.1038/news030811-3