Phenomena associated with the anomalous absorption of high energy gamma radiation. -III

Abstract
In the previous paper we have presented the results of certain experiments on the absorption of the secondary γ-radiation emitted by atomic nuclei when irradiated with very high energy γ-radiation. We now proceed to discuss the conclusions which may be derived from these results regarding the proportion of the γ-ray energy absorbed by a nucleus which is emitted by it as radiation having a smaller quantum energy. There are also presented some new experimental results concerning the isotropic distribution of this radiation, together with an account of certain other experiments designed to throw some light on the mechanism of this interaction. Before these points are considered, however, it seemed worth while, in view of the inadequacy of any theoretical interpretation of the phenomenon, to make quite certain that the secondary radiation was really a γ-radiation. For this purpose the following experiments were carried out.

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