Energy Levels of Rh103 from the Decay of Pd103 and Ru103

Abstract

The decay schemes of ${\mathrm{Pd}}^{103}$ and ${\mathrm{Ru}}^{103}$ have been studied with the use of two scintillation spectrometers in coincidence. It has been observed that the electron capture activity of ${\mathrm{Pd}}^{103}$ is accompanied by faint $\gamma$ radiation having the several quantum energies of 40, 65, 300, 365, and 495 kev with absolute intensities per disintegration of 1×${10}^{-3\mathrm{}}$, 4×${10}^{-5\mathrm{}}$, 1.2×${10}^{-4\mathrm{}}$, 6.6×${10}^{-4\mathrm{}}$, and 1×${10}^{-4\mathrm{}}$. The gamma rays of energy 65 and 300 kev were found to be in coincidence. The inner bremsstrahlung spectrum associated with the capture transition leading to the 57-minute isomeric level in ${\mathrm{Rh}}^{103}$ is of intensity small in comparison with that of the aforementioned gamma rays. The $\beta$ decay of ${\mathrm{Ru}}^{103}$ is accompanied by gamma rays of energies 55, 440, 495, 555, and 610 kev with absolute intensities per disintegration of 1×${10}^{-2\mathrm{}}$, 5×${10}^{-3\mathrm{}}$, 0.90, 5×${10}^{-3\mathrm{}}$, and 6×${10}^{-2\mathrm{}}$. A $\beta$ spectrum of end point 110±10 kev is coincident with the 610-kev gamma ray. A level scheme for ${\mathrm{Rh}}^{103}$ with probable orbitals has been proposed.