Abstract
I AM afraid that Prof. Boltwood does not quite see the reason why I hesitated to endorse the statement in question: it was necessary to quote the whole paragraph as it appears in the article, but my difficulty was confined to the words “principally carnotite.” It is, of course, obvious that the chief source of radium is the minerals containing a higher percentage of uranium, and it was for that reason only that I hesitated to place carnotite, which at most carries 60 per cent, of uranium, before the pure uranium mineral pitchblende, of which considerable deposits are known to exist both at St. Joachimsthal and in Cornwall, as well as in other countries.
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GARDINER, J. Carnotite Ores and the Supply of Radium. Nature 100, 425–426 (1918). https://doi.org/10.1038/100425c0
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DOI: https://doi.org/10.1038/100425c0
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