Decay of the 4.5-HourBr80Isomer

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Abstract
Evidence of a limit of 85±4 percent to the chemical extractability of the 18-min. bromine from its 4.5-hr. parent isomer is presented. This is interpreted as the fraction of 4.5-hr. bromine which emits conversion electrons. In agreement with Grinberg and Roussinow gamma-rays of about 30 to 40 kev average energy were found coming from the 4.5-hr. bromine. It does not seem possible to make a unique interpretation yet. The presence of a gamma-ray accompanying the 18-min. period is confirmed, but its energy is placed above 0.6 Mev.