Radiations fromCd115,In115*, andHf181

The characteristic radiations of ${\mathrm{Cd}}^{115}$, ${}_{}{}^{*}{}_{}{}^{}\mathrm{In}_{}^{115}{}_{}{}^{}$, and ${\mathrm{Hf}}^{181}$ have been measured by absorption and coincidence methods. The beta-gamma-coincidence rate of ${\mathrm{Cd}}^{115}$ indicates the presence of an inner beta-ray group at 0.46 Mev. Coincidence measurements show that the 4-hour isomer of indium (115) decays with the emission of a single partially converted gamma-ray. ${\mathrm{Hf}}^{181}$ was found to emit 0.52 Mev beta-rays (aluminum absorption) and 0.17- and 0.47-Mev gamma-rays (lead absorption). Beta-gamma-coincidence data indicate that the beta-ray spectrum of ${\mathrm{Hf}}^{181}$ could be complex. Beta-beta- and gamma-gamma-coincidence data were also obtained.