Decay ofTe125m

The two-step isomeric transition in ${\mathrm{Te}}^{125m}$ has been studied with proportional counters in coincidence, a NaI crystal scintillation spectrometer and a thin lens beta-ray spectrometer. The following branching fractions were determined: 110-kev transition: $K$ conversion=0.54±0.01, other conversion=0.46, unconverted gamma-ray=0.0034±0.0005; 35.5-kev transition: $K$ conversion=0.80±0.05, $L$ conversion=0.11 ±0.02, $M$ conversion=0.02±0.004, unconverted gamma-ray=0.07±0.02.