Abstract In order to meet the requirement of radiation shielding materials for space nuclear reactors, 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 gamma ray shielding effects of functional filler with different ratios and content were simulated. Then, based on the gamma-ray energy range generated by space nuclear reactors, the γ-ray protection performance of epoxy resin composites under different energy ranges was studied. Finally, the effects of the particle size and arrangement of the fillers on the γ-ray shielding properties of the composites were presented, and the results showed that the smaller of the particle size, the better the shielding effect will be; for the same size of the filler, the arrangement of the filler with a larger projection area has a better γ-ray shielding performance. The effect of Gd₂O₃/Bi₂O₃ added to epoxy resin base on low-energy gamma rays is obvious, but the effect on high-energy rays is less.
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Cao et al. (2024) studied this question.
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