Simulation of γ-Ray Radiation Shielding Utilizing Gd₂O₃/Bi₂O₃/Epoxy Resin

In order to meet the requirement of radiation shielding caused by medical isotopes, nuclear reactors, and industrial facilities, gamma shielding effect of epoxy resin base added with Gd₂O₃/Bi₂O₃ particles was studied by Monte Carlo simulation platform Geant4 in this paper. Firstly, the shielding effects of functional filler with different ratios of Gd₂O₃ and Bi₂O₃ particles showed that both the Gd₂O₃ and Bi₂O₃ fillers have almost identical shielding effects. Then, the shielding effects of the epoxy resin composites under different ranges of on γ-ray were studied. We found the γ-ray intensities decreased rapidly with the depth. From 10 to ~ 100 keV, the γ-ray intensities revealed a decreased trend with the gamma energy except two upshifts at 50.50 keV and 91.00 keV. We also found that the shielding effect increases with decreasing the particle size at the γ-ray energy lower than 100 keV, above 500 keV, the effect can be ignored; the arrangement of the filler greatly affects the γ-ray shielding performance, the filler arrangement with a larger projected area will have a better γ-ray shielding effect due to a serious collision between gamma rays and filler particles.