Abstract
IT is very well known that the rate of loss of helium from different radioactive minerals and rocks depends on the dimensions of the surface and on the temperature. When minerals are finely ground, or heated to a high temperature, there is a considerable loss of helium, which can attain about 90 per cent when both of the above mentioned factors are concerned.
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CHLOPIN, V., HERLING, E. & JOFFÉ, E. Experiments on Evaluation of Helium from Radioactive Minerals and Rocks. Nature 133, 28 (1934). https://doi.org/10.1038/133028a0
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DOI: https://doi.org/10.1038/133028a0
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