Decay of Ruthenium-105

The decay of ${\mathrm{Ru}}^{105}$ has been studied employing two scintillation spectrometers in coincidence. It is found that ${\mathrm{Ru}}^{105}$ decays to the excited levels of ${\mathrm{Rh}}^{105}$ with the emission of six $\beta$ groups, with end-point energies of ∼ 125, 525, 915, 1080, 1150, and ∼1800 kev, the branching ratios being approximately ∼0.002, 0.068, 0.11, 0.30, 0.51, and ∼0.01, respectively. The subsequent $\gamma$ rays have the energies of 130, 265, 320, 400, 475, 485, 665, 725, 875, 960, 1350, and 1750 kev. From $\gamma -\gamma$ and $\beta -\gamma$ coincidence measurements, a level scheme of ${\mathrm{Rh}}^{105}$ has been worked out, showing the excited states at 130, 395, (or 530), 475, 725, 795, 960, 1350, and 1750 kev.