Letter | Published:

Radium and Geology

Naturevolume 74page610 (1906) | Download Citation



IN NATURE of October 11 (p. 585) two letters appear on this subject, in reply to which a few words may perhaps usefully be said. Mr. Fisher's principal point is that if the earth's internal heat is maintained by radium, there is no room left for that shrinkage of the globe by cooling which some geological theories require. I think that the difficulty is only apparent. The duration of radium, it is generally agreed, is limited to a few thousand years. The supply must be in some way maintained, or there could he no radium on the earth now. Writers on radioactivity are generally agreed that the radium supply is kept up by the spontaneous change of uranium into radium.

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