Half-lives of isomeric levels of 107mAg, 109mAg and 103mRh photoactivated by 60Co γ-ray irradiation

Photoactivation by γ-rays from 60Co of 10 kCi has been performed for isomers of 107mAg, 109mAg and 103mRh and half-lives of these isomers were determined. Gamma-rays emitted from 107mAg and 109mAg were measured with a low-background Ge detector and internal conversion electrons from 103mRh were measured with a 2π gas flow counter. The half-lives obtained are: 107mAg: 44.5±0.8 s, 109mAg: 38.0±1.2 s and 103mRh: 54.8±3.8 min. The results are in agreement with previous values obtained by different excitation methods.