Radiations fromSb122

The radiations from ${\mathrm{Sb}}^{122}$ were investigated by use of a magnetic solenoid spectrometer, a coincidence scintillation spectrometer, and a proportional counter spectrometer. Three ${\beta }^{-}$-groups are present with end-points 1970±5, 1400±10 740±20 kev. The highest energy $\beta$-groups exhibits an $\alpha$-shape and the two lower $\beta$-groups have allowed Kurie plots. Gamma-ray investigations showed that four gamma rays of energies 566±4, 686±4, 1137±6 and 1260±6 kev could be associated with the decay of ${\mathrm{Sb}}^{122}$. Coincidence techniques related the 1150-kev $\gamma$-ray with the $K$-capture side and also showed that the 566 and 686-kev $\gamma$-rays are in cascade. The ratio of ($K+L$) capture relative to total ${\beta }^{-}$-emission was found to be 3.1 percent. The ratio of $K$-capture to the excited state of ${\mathrm{Sn}}^{122}$ and $K$-capture to the ground state was found to be 1:2.1. The intensities of all radiations are listed and the $\mathrm{ft}$-values for various transitions calculated. An upper limit of ${10}^{-3\mathrm{}}$ is placed on the positron emission.