Radio-activity of Ordinary Materials | Nature
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I SHOULD like to say a few words in answer to Prof. Armstrong's letter, in which he suggests that the effects observed by Prof. McClennam and myself are not due to radio-activity, but to
chemical changes at the surface of the substances experimented upon. In speaking of the radioactivity of ordinary materials, I mean that they show effects differing only in degree from those
exhibited by uranium and radium. These effects, as observed experimentally, are as follows:—
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