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<p>Polymer-based composites are increasingly explored for gamma radiation shielding due to their lightweight nature, ease of fabrication, and versatility. Among these composites, poly(methyl methacrylate) (PMMA), also known as Lucite, is widely used in medical and industrial applications. In this study, a novel PMMA-based composite reinforced with varying weight fractions (2.5–10 wt%) of mercury oxide (HgO) was developed and evaluated for its gamma shielding performance using both experimental methods and Monte Carlo simulations with a <sup>137</sup>Cs source (662&#xa0;keV). Two simulation platforms, MCNP6 and GEANT4, were used to compute key shielding parameters of linear attenuation coefficient (LAC), mass attenuation coefficient (MAC), half-value layer (HVL), tenth-value layer (TVL), mean free path (MFP), and effective atomic number (Z<sub>eff</sub>). Simulated results agreed closely with the experimental data, with discrepancies under 5%, which validated the reliability of the models. Experimentally, the LAC increased from 0.044&#xa0;cm<sup>−1</sup> for pure PMMA to 0.096&#xa0;cm<sup>−1</sup> at 10 wt% HgO, more than doubling the attenuation capability. The HVL correspondingly decreased from 15.47&#xa0;cm to 7.19&#xa0;cm, and the Z<sub>eff</sub> increased modestly from 3.6 to 4.1. These improvements demonstrated the composite’s enhanced shielding effectiveness with increasing HgO content. The material also maintained good transparency at lower loadings, supporting its potential for lightweight, transparent shielding applications in medical and nuclear environments.</p>

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Comparative analysis of Monte Carlo simulations and experimental evaluation of PMMA reinforced with hgo for gamma radiation shielding

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月2日

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  • Mahdieh Mokhtari Dorostkar,
  • Akbar Abdi Saray

摘要

Polymer-based composites are increasingly explored for gamma radiation shielding due to their lightweight nature, ease of fabrication, and versatility. Among these composites, poly(methyl methacrylate) (PMMA), also known as Lucite, is widely used in medical and industrial applications. In this study, a novel PMMA-based composite reinforced with varying weight fractions (2.5–10 wt%) of mercury oxide (HgO) was developed and evaluated for its gamma shielding performance using both experimental methods and Monte Carlo simulations with a 137Cs source (662 keV). Two simulation platforms, MCNP6 and GEANT4, were used to compute key shielding parameters of linear attenuation coefficient (LAC), mass attenuation coefficient (MAC), half-value layer (HVL), tenth-value layer (TVL), mean free path (MFP), and effective atomic number (Zeff). Simulated results agreed closely with the experimental data, with discrepancies under 5%, which validated the reliability of the models. Experimentally, the LAC increased from 0.044 cm−1 for pure PMMA to 0.096 cm−1 at 10 wt% HgO, more than doubling the attenuation capability. The HVL correspondingly decreased from 15.47 cm to 7.19 cm, and the Zeff increased modestly from 3.6 to 4.1. These improvements demonstrated the composite’s enhanced shielding effectiveness with increasing HgO content. The material also maintained good transparency at lower loadings, supporting its potential for lightweight, transparent shielding applications in medical and nuclear environments.