GAMMA RAYS PRODUCED IN THE FISSION OF U235

Abstract

This paper describes measurements which have been made on the coincidence counting rate between the fissions produced in an ionization chamber and the discharges of a Geiger counter. By determining the absolute efficiency of the counter, the total energy emitted in the form of γ-radiation was estimated to be about 4.6 ± 1.0 Mev. Measurements have been made on the range of the electrons projected from an aluminum radiator placed between the ionization chamber and two thin-walled counters. From this experiment, the average energy of the radiation appears to be about 2.5 Mev. The result is confirmed by absorption measurements in lead. The absorption curve indicates a fairly homogeneous radiation and gives some evidence for the existence of a softer component with an energy of about 500 kev.