Abstract
DR. BOLTWOOD established the constancy of this ratio for all the minerals he examined (Phil. Mag., April, 1905). He examined, however, no mineral in which uranium was present as phosphate, nor did he examine the then newly discovered mineral thorianite. Later, Mdlle. Gleditsch (Comptes rendus, cxlviii., 1451; cxlix., 267) found that the ratio radium to uranium was about 18 per cent. greater in thorianite than in Joachimsthal pitchblende, while in autunite, a phosphate of uranium, this ratio was about 20 per cent. less. She separated the radium chemically before estimating it.
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RUSSELL, A. The Ratio between Uranium and Radium in Minerals. Nature 84, 238–239 (1910). https://doi.org/10.1038/084238e0
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DOI: https://doi.org/10.1038/084238e0
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