Abstract
WITH reference to the action of radium on glass, and its removal by exposure to sunlight, the following unintentional experiment may possibly be of interest. Many years ago I had a section of a piece of granite prepared, and then another after the stone had been made red hot in an ordinary bright fire.
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HUNT, A. The Halos Round Zircons in Biotite. Nature 78, 198 (1908). https://doi.org/10.1038/078198c0
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DOI: https://doi.org/10.1038/078198c0
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