Radiations of Osmium-193 and Osmium-191

The radiations of ${\mathrm{Os}}^{193}$ and ${\mathrm{Os}}^{191}$ have been examined in a thin-lens beta-ray spectrometer and in coincident scintillation spectrometers. Ten gamma rays and seven beta spectra have been detected in the decay of ${\mathrm{Os}}^{193}$, revealing energy levels in ${\mathrm{Ir}}^{193}$ at 73, 138, 356, 388, 458, and 558 kev. In order of decreasing end-point energy, the relative intensities of the beta spectra of ${\mathrm{Os}}^{193}$ are estimated as 67, 6, 4, 2, 3, 13, and 5. The beta-ray spectrum of ${\mathrm{Os}}^{191}$ has been observed, and the $\frac{K}{L}$ ratio of the 129-kev transition of ${\mathrm{Os}}^{191}$ has been measured as 2.4, corresponding to a mixture of 54% $E2\mathrm{}$ in $M1\mathrm{}$.