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Abstract In the current study, the epoxy resin (ER) material was mixed with 5% of boron carbide (B4C) and different ratios of lead chloride (PbCl2) ranging from 0% to 60% by weight (wt.%) to evaluate its effectiveness as a γ-ray shield. The synthesized composites were characterized using X-ray diffraction (XRD) and Scanning electron microscope (SEM) for studying their structure and filler distribution, respectively. From XRD, the amorphous characteristics of the matrix material are indicated by the large hump that the pure ER displays at about 15◦., while the addition of filler to the ER matrix, new XRD peaks have appeared indicating the presence of B4C/PbCl2.The SEM analysis of the composites showed that the B₄C/PbCl2particles were uniformly dispersed in the polymer matrix. Furthermore, the mechanical properties of the samples have shown significant improvement as a result of increasing the PbCl2 ratio in the composite. Additionally, the γ-ray attenuation of the prepared samples was calculated using the Phy-X/PSD software. The results show that sample S7 (5% B₄C/60% PbCl2/ER) demonstrates a greater capacity to absorb γ-rays than the other samples, as demonstrated by its notably higher mass attenuation coefficient (MAC), shorter mean free path (MFP), and lower half-value layer (HVL) values. The measured MAC values at 0.662 MeV for samples S1 to S7 were 0.0815, 0.08275, 0.08482, 0.08712, 0.08903, 0.09232, and 0.09425 cm²/g, respectively, showing good agreement with the calculated values. Meanwhile, increasing the PbCl2content enhances thermal neutron absorption, as 1 cm of sample 7 attenuate over 99.6% of the initial thermal neutron flux. This new radiation shielding composite material is proposed for use in fields of nuclear radiation such as nuclear medicine, transport and storage of radioactive waste, nuclear power plants and related fields to shield against γ-rays.