Abstract
APROPOS of Mr. Strutt's letter in NATURE of July 7, it may be recalled that the Curies found that the artificially prepared chalcolite (the uranium copper phosphate) contained no radium, whereas the natural substance did.
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JOLY, J. Origin of Radium. Nature 70, 246 (1904). https://doi.org/10.1038/070246d0
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DOI: https://doi.org/10.1038/070246d0
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