The beta-ray spectrum of radium E was measured by means of a magnetic spectrometer and coincident counters with special emphasis on the shape of the curve in the neighborhood of the end-point. Because of the strong source available, and the low background of the detecting mechanism, it was possible to obtain significant data much closer to the end-point than has been done heretofore. The distribution was found to end, without a tail, at Hp = 5330 oerstedcm, or 1.17 X10 6 electron volts. The Fermi and K-U plots of the experimental data do not give straight lines as predicted by the theory. Extrapolation of the straight part of the K-U plot gives an end-point 17 percent higher than that observed.
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