THE STUDY OF GAMMA RADIATION PARAMETERS ON THE COMPUTER MODEL OF THE NEUTRON SOURCE ON THE LINEAR ELECTRON ACCELERATOR

Abstract

In the Geant4 software, with the help of the computer model of the neutron source at the output of the linear electron accelerator, the main characteristics of gamma radiation were determined at the location of the irradiated samples and outside on top of the lead shielding on the large detector. We conducted several computer experiments on 107 primary electrons with an energy of 25 MeV. The analysis of the obtained data showed that the graphite neutron reflector is also an effective reflector of low-energy gamma quanta (Eγ < 1 MeV), its presence increased the flow of gamma quanta of these energies at the small detector by 30%. At the same time, lead protection reduced the gamma background on the samples and in the bunker by more than 20 times. The performed calculations proved that lead shielding with a thickness of 5 cm is sufficiently effective for conducting experiments on neutron programs at primary electron energies of 25 MeV.