Electromagnetic Spectrum of Radium D

The electromagnetic spectrum of RaD has been studied by the proportional counter spectrometry technique. The work of the Curie Laboratory on the gamma-ray spectrum has been generally confirmed. However, the presumed $K$ x-ray lines are of much lower intensity and occur at a lower energy than previously reported. The $L$ x-ray intensity is 22 per hundred disintegrations, indicating 0.63 conversion per disintegration and a conversion coefficient of 18.3 for the principal gamma-ray.