Abstract
The conversion and Auger electrons of Radium D have been studied in a lens β-ray spectrometer with a post-focusing electron accelerator. The number of conversion electrons due to the 46.7 keV. γ-ray is found to be 59.2 ± 5 per hundred disintegrations but reasons are given which suggest that this value be regarded as a lower limit. The Auger electrons have been compared with those resulting from the ThB-ThC transition.