Build-up Factors and Fast Neutron Properties of Some Plastic and Polymer for Shielding Materials: A Simulation
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Abstract
This work discussed the theory of radiation shielding for some plastics and polymers. There were 6 samples for this study. They were bone-equivalent plastic (B-100), polyvinyl chloride (PVC), air equivalent plastic (C-552), radio chromic dye film (nylon base), polyethylene terephthalate (mylar) and polymethyl methacrylate (PMMA). These samples were simulated in term of photon and neutron shielding behaviors. Consequently, the theoretical study were separated into 2 types for photon shielding and neutron shielding. The geometrical progression (G-P) method was used to stimulate energy absorption build-up factor (EABF) and exposure build-up factor (EBF), at photon energies ranging from 15 keV to 15 MeV and up to 40 deep penetration mean free path (mfp) for photon shielding. Moreover, fast neutron removal cross-section (SR) values were estimated by partial density method. The data of the simulation were found that equivalent atomic number (Zeq) polymethyl methacrylate (PMMA) had the lowest values whereas EABF and EBF values had maximum values. Furthermore, polyvinyl chloride (PVC) had the highest equivalent atomic number (Zeq) values whereas EABF and EBF values had the lowest values. The result for main interaction of photon with matter can be separated on energy regions that is photoelectric absorption (PE), Compton scattering (C) and pair production (PP) interactions. PE is main interaction at low energies ranging, C is main interaction at intermediate energies ranging and PP is main process at high energies ranging. The results indicated that polyvinyl chloride (PVC) exhibited excellent radiation shielding. Other than fast neutron removal cross-section value (SR) of plastics and polymers, which estimated by partial density method, it was found that radio chromic dye film (nylon base) had the highest value. This result indicated that radio chromic dye film (nylon base) was the excellent neutron shielding material.
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