| Summary: | Three different samples were synthesized based on polyepoxide resin, a solidifying agent, and a Bi<sub>2</sub>O<sub>3</sub> doping compound. The polyepoxide resin and solidifying agent were added in a 2:1 ratio by weight and the Bi<sub>2</sub>O<sub>3</sub> compound was added in ratios of 0, 5, and 10 wt. %. The density of the synthesized composites was measured using an MH-300A densimeter with an uncertainty in measurement of 0.001 g/cm<sup>3</sup>. The measurements showed that the density of the fabricated composite varied from 1.103 g/cm<sup>3</sup> to 1.20 g/cm<sup>3</sup> when the reinforcing Bi<sub>2</sub>O<sub>3</sub> compound was raised from 0 wt. % to 10 wt. %. Furthermore, the γ-ray shielding parameters were evaluated based on the simulated mean track length of γ-photons inside the synthesized composites using MCNP-5 code. The simulated results show an enhancement in the shielding parameter when increasing the Bi<sub>2</sub>O<sub>3</sub> concentration, where the linear attenuation coefficient values increased from 0.101 cm<sup>−1</sup> to 0.118 cm<sup>−1</sup> as the Bi<sub>2</sub>O<sub>3</sub> concentration increased from 0 to 10 wt. %. The increase in the LAC has a positive effect on the other shielding properties.
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