Abstract
The energy distribution curve for the beta-ray spectrum of radium E has been measured. The spectrum was found to have a maximum at 3.87 \ifmmode\times\else\texttimes\fi{} ${10}^{5}$ electron volts and an endpoint at (15.34\ifmmode\pm\else\textpm\fi{}0.28) \ifmmode\times\else\texttimes\fi{} ${10}^{5}$ electron volts corresponding to an ${H}_{\ensuremath{\rho}}$ of 6604\ifmmode\pm\else\textpm\fi{}98. The spectrum was obtained by the magnetic focusing method and the particles were counted by a Geiger counter. The absorption of the beta-rays in the counter window was determined and allowed for. The large number of very low energy beta-rays found by H. O. Richardson was not confirmed. The energy distribution found does not agree with that of Fermi's theory. The results obtained are compared with those of previous investigators.
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