Spectroscopic analysis of photoneutrons in intense y-ray background

CR-39 SSNTD is used to measure the photoneutron spectrum produced by a medical linear accelerator in an intense y-ray background. The spectroscopic resolution and the neutron detection threshold have been improved by introducing the event selection criteria, based on the track diameter-brightness correlation. The CR-39 detector's efficiency is determined by adapting the 1H(n,el) cross section from the ENDF/B-VIII.0 evaluations. The measured spectrum was reproduced through Talys-1.96 calculations by implementing the Gogny-HFB microscopic level density model.