A Monte Carlo Study on the Shielding Properties of a Novel Polyvinyl Alcohol (PVA)/WO۳ Composite, Against Gamma Rays, Using the MCNPX Code
محل انتشار: مجله فیزیک و مهندسی پزشکی، دوره: 9، شماره: 4
سال انتشار: 1398
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 40
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شناسه ملی سند علمی:
JR_JBPE-9-4_010
تاریخ نمایه سازی: 30 دی 1402
چکیده مقاله:
Background: In recent years, there has been an increased interest toward non-lead radiation shields consisting of small-sized filler particles doped into polymer matrices. In this paper, we study a new polyvinyl alcohol (PVA)/WO۳ composite in the presence of high-energy gamma photons through simulation via the Monte Carlo N-Particle (MCNP) simulation code. Material and Methods: An MCNP geometry was first designed in the software based on real-life conditions, and the generated geometry was validated by calculating the mass attenuation coefficient and making relative comparisons with standard tables. Using the lattice card in the MCNP input file, WO۳ was considered as a filler dispersed in a PVA polymer at sizes of ۱۰ µm and ۳۰ nm with a weight concentration of ۵۰ wt%. By defining ۱۰۶-photons emitted from point sources corresponding to ۶۶۲, ۷۷۸, ۹۶۴, ۱۱۱۲, ۱۱۷۰, ۱۱۳۰ and ۱۴۰۷ keV energy levels, and the F۴ tally used to estimate the cell average flux, the values for mass attenuation coefficient and half-value layer (HVL) were calculated. Results: The results show that PVA/WO۳ composite can be considered to shield X and γ-rays in the mentioned energies. However, nano-WO۳ has a better ability to shield in comparison with the micro-WO۳ fillers. The differences in attenuation changed at different energy levels, ascribed to the dominance of pair production occurrence and photon interactions in the composite, which was in good agreement with previous studies. Conclusion: Our finding showed that the composite can be considered as a lead-free shielding material.
کلیدواژه ها:
نویسندگان
F Kazemi
Department of Nuclear Engineering, Islamic Azad University, Arsanjan Branch, Arsanjan, Iran
S Malekie
Radiation Application Research School, Nuclear Science and Technology Research Institute, Karaj, Iran
M A Hosseini
Ionizing and Non-Ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran
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