Abstract
MR. F. P. MENNELL, in NATURE of November 18, raises the question whether the more strongly active of the rock-forming minerals owe their activity to thorium. I have a considerable number of data on this subject obtained by direct experiment, estimating radium and thorium by their emanations. I find, by this method, that zircon, sphene, and apatite usually contain some thorium, but that it generally contributes less to the activity than the substances of the uranium-radium series.
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STRUTT, R. Radio-activity and the Rocks. Nature 82, 98 (1909). https://doi.org/10.1038/082098c0
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DOI: https://doi.org/10.1038/082098c0
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