Abstract
A SOLUTION of almost pure radium nitrate which had been used for spectrographic work was evaporated to dryness in a dish, and the crystalline residue examined in a dark room. It was feebly luminous.
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The Emanations of Radium 1 . Nature 67, 522–524 (1903). https://doi.org/10.1038/067522b0
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DOI: https://doi.org/10.1038/067522b0