Computational-experimental investigation of radiations shielding characteristics for polymethyl methacrylate

Abstract

This study explores the gamma radiation shielding properties of polymethyl methacrylate (PMMA) samples augmented with varying proportions of silicon carbide (SiC). The neutron radiation shielding properties were determined through theoretical calculations using specialized software (Phy-X/PSD). Experimental measurements were conducted utilizing a NaI(Tl) detector system, capturing gamma-ray energies emitted by some radiation sources (¹³⁷Cs and ⁶⁰Co) at 0.662, 1.173, and 1.332 MeV. To enhance result accuracy, a slender beam geometry was established with a collimator. Theoretical calculations of shielding parameters were conducted across an energy spectrum ranging from 0.015 to 15 MeV utilizing specialized software. Experimental linear attenuation coefficient outcomes facilitated the calculation of half and tenth layer thickness values, mean free path. Furthermore some parameters such as electron density and effective atomic number were derived using software alongside measurement results. Fast-neutron removal cross sections for neutron radiation were ultimately determined. This findings reveal an increase in LAC values with rising SiC ratio in PMMA, yet they exhibit a decrease with rising photon energy. Conversely, MFP, HVL, TVL, and d_Pb values escalate with energy increase, whereas they diminish with higher SiC ratios in PMMA. Theoretically calculated fast neutron removal cross sections augment with escalating SiC ratios. Comparison of gamma radiation shielding parameters, both experimental and theoretical, demonstrates a harmonious correlation between the two, affirming their reliability and congruence.