Excerpt from I. The Absorption of the Different Types of Beta Rays Together With a Study of the Secondary Rays Excited by Them; II. On the Secondary Rays Excited by the Alpha Rays From Polonium, Parts I. And II: A Thesis
With the arrangement he adopted it was possible that in... cutting Off the ¿ rays in order to study the effect of the )1 radiation alone he also cut Off a greater proportion Of the latter than he estimated. If this were so it would result in ascribing to the 6 radiation a part of the secondary radiation. Which properly should have been ascribed to the y ravs.
In view of the importance of his results in their relation to theories of secondary radiation now being put forward by Bragg2 and others, it was thought well to make a more extended examination Of the secondary radiations excited by both /3 and by y rays, and in the follow ing paper an account is given of some experiments in which the secondary radiation both from the back and the front of metal plates was studied, when these were traversed by y rays alone, and also when pencils of ¿ rays of different types were allowed to fall on them.
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