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The gamma rays of radium and its disintegration products Matthews, Frank Samuel


A short history of gamma ray investigations is given. Particular reference is made to the use of beta-ray spectrometers in these investigations, and a detailed description is given of the thin-lens beta-ray spectrometer and its auxiliary apparatus. The energies of the gamma rays of radium and of its equilibrium disintegration products are determined by measuring the momentum of the photoelectrons ejected by these gamma rays from a lead radiator. These energies agree well with the values reported by Ellis and Mann, and also agree with most of the previously unconfirmed values reported by Latyshev. Evidence is given for the existence of a gamma ray (804 Kev.) previously unreported. The energy calculations are based on a calibration using the F line of thorium B (Hϱ = 1385.6 gauss-cm.)

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