Decay ofRh101mandRh101g

The decay of sources containing ${\mathrm{Rh}}^{101m}$ (4.43 day) and ${\mathrm{Rh}}^{101g}$ (3.3 yr) has been investigated using bettand gamma-ray spectroscopic methods. Conversion-electron data for ${\mathrm{Rh}}^{101m}$ electron-capture decay have been obtained to complement the gamma-ray data appearing in the literature. The observed transition energies 21.58, 127.24, 179.42, 183.9, 233.4, 237.7, 306.67, and 544.9 keV are consistent with a decay scheme including excited levels in ${\mathrm{Ru}}^{101}$ at 127.2, 306.7, 311.2, (523), and 544.5 keV. The decay of ${\mathrm{Rh}}^{101g}$ is accompanied by transitions with energies 127.24, 198.4, 295.3, 325.2, and 421.8 keV; and coincidence data require that levels in ${\mathrm{Ru}}^{101}$ at 127.2, 325.4, and 422.1 keV be populated. The problem of spin assignments for the levels in ${\mathrm{Ru}}^{101}$ is discussed.