The Second Transition in the Decay ofSn119m

The photons from the second transition in ${\mathrm{Sn}}^{119m}$ were detected by using two proportional counters in coincidence. These photons have an energy of 23.8±0.6 kev and could be differentiated from In x-rays only by coincidence measurements. The fraction of the second transitions which emits photons is 0.13±0.03, corresponding to a total conversion of 7.3±1.7. The slow neutron activation cross section of ${\mathrm{Sn}}^{118}$ was found to be 0.01 barn.