Decay of ${\mathrm{Ru}}^{105}$, ${\mathrm{Pd}}^{109}$, and ${\mathrm{Rb}}^{86}$

A decay scheme for ${\mathrm{Ru}}^{105}$ has been proposed with levels at 130, 395 (or 530), 475, 685, 726, 795, 960, 1350, and 1720 kev. These levels are excited by seven beta groups of maximum energies of 1875, 1185, 1150, 1080, 915, 525, and 155 kev. Beta-gamma coincidence studies have confirmed a decay scheme for ${\mathrm{Pd}}^{109}$ having levels at 88, 217, 258, 307, 412, 719, and 860 kev, while existence of a 260- and a 400-kev beta group in addition to the 1030-kev beta ray has been established. The half-lives of ${\mathrm{Ru}}^{105}$, ${\mathrm{Rh}}^{105}$, and ${\mathrm{Pd}}^{109}$ have been determined as 4.43±0.02 hours, 35.88±0.02 hours, and 13.47±0.01 hours, respectively. The branching ratio of ${\mathrm{Rb}}^{86}$ has been experimentally measured as (8.79±0.09)%.