Abstract
NEW information concerning the spectrum of γ-rays may be obtained if we consider the energy of Compton's recoil electrons. As has been shown already (NATURE, 116, p. 206, 1925), these electrons can be observed in a Wilson's cloud expansion chamber. In the case of very fast electrons, their velocity is determined from the curvature of the tracks photographed in a homogeneous magnetic field. The energy of recoil E and the frequency v of the primary rays are connected by the following relation of Debye and Compton:
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