Application of EGS-4 code for evaluating a Compton suppression system

The response evaluation of the Compton suppression system is usually conducted in controlled experiments with specific radiation sources. However, such sources alone cannot be used to evaluate the advanced system designs to be used in the high background radiation field of a nuclear power plant. A computational code is required to evaluate such a system. We experimentally determined the responses of a Ge detector, a scintillation detector, and a Compton suppression system; and we evaluated the validity of the results using the EGS-4 Monte Carlo Simulation code. Results showed that when the Compton suppression system is simulated, high accuracy cannot be achieved without spending at least 100 hours developing the model for the peripheral structures of the detector and for the γ-ray scattering. However, the experimental results agreed closely with the simulation results, and the EGS-4 code was validated to be applicable to the advanced system design