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It is now generally accepted that the disintegration electrons from radioactive nuclei have a continuous distribution with energy. The end-points of these distribution curves, representing the maximum kinetic energies carried by the β-rays, have been determined in a considerable number of cases and appear to be quite definite. The purpose of this paper is twofold. First, new experimental work on the β-rays from uranium X will be presented in sections 2, 3 and 4. This includes a determination of the end-point of its normal β-ray spectrum, which was found to be 2·32 million volts, and a search for β-rays having energies from 3 to 7 million volts. None were found, and an upper limit on their number was determined. Secondly, a critical survey of the data on the end-points of a number of [3-ray spectra with a list of preferred values will be given in section 5. It will then be shown, in section 6, that a relation between the maximum energy emitted in a spectrum of β-rays and its disintegration constant appears to exist. 2.Methods of Determining the End-points of Continuous Spectra . Three methods have been used to find the maximum energies in β-ray spectra. One direct method, carried out principally by Madgwick and Gurney, consists of analysing the β-rays with the usual semicircular focussing in a magnetic field, and determining, from the field strength and the radius of curvature of the path, the velocity of the fastest particles that can be detected by electrical methods.

The maximum energy of the β-Rays from uranium X and other bodies