Abstract
This paper presents the gamma shielding performance of Poly lactic acid (PLA) composites doped with 4%, 8%, 12%, and 16% Gd2O3 to investigate the impact of dopant amount on gamma shielding with an energy of 241Am (59.5 keV), 133Ba (81.0, 276.4, 302.9, 356.0, 383.9 keV), 22Na (511.0,1274.5 keV), 137Cs (661.7 keV), and 60Co (1173.2, 1332.5 keV) sources. To characterize the radiation shielding properties of the samples, mass attenuation coefficient (μ/ρ), linear attenuation coefficient (μ), half-value layer (HVL), tenth-value layer (TVL), and effective atomic number (Zeff) parameters were calculated and compared with the values computed by WinXCOM software. It is revealed that theoretical and experimental results are in agreement and the radiation protection efficiency was enhanced with the increase of the dopant amount. Radiation effects on the structure and thermal stability of the samples were also studied by Attenuated total Reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) measurements and thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The spectroscopy results showed a remarkable decrease in the absorbance value of the composites after gamma irradiation.
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