Letter | Published:

Radium and Geology

Nature volume 74, page 585 (11 October 1906) | Download Citation



IN the Proceedings of the Royal Society for May and August there appeared important papers by the Hon. R. J. Strutt upon radium in the earth's crust and the earth's internal heat. Taking known values of the heat production of radium, per grain per second, assuming Lord Kelvin's estimate of the conductivity of rocks in situ and Prestwich's estimate of the temperature gradient at the surface, Mr. Strutt shows that, if the gradient expresses the outflow of heat due to radium in the earth, the radium must be confined to a comparatively thin crust, because his laboratory experiments prove that the smallest radium content existing in the rocks examined would give a much higher gradient than the one observed if the radium were distributed throughout the entire earth.

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  1. Graveley, Huntingdon, September 28.

    • O. FISHER


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