Gamma-Radiation from Tantalum, Iridium, and Gold

By using a photographic method in connection with semi-circular focusing magnetic spectrometers, the beta-spectra due to internal conversion have been evaluated for gold 198, iridium 194, and tantalum 182. For gold a simple spectrum of 3 lines with differences the same as between the $K-L-M$ levels of mercury indicate a single gamma-ray of energy 0.408 Mev following beta-emission.