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Lead–bismuth tungstate composite as a protective barrier against gamma rays
Materials Chemistry and Physics ( IF 4.6 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.matchemphys.2021.125262
Eman E. Bayoumi 1, 2 , Mahmoud O. Abd El-Magied 1 , Emad A. Elshehy 1 , Bahig M. Atia 1 , Karem A. Mahmoud 1, 3 , Lilly H. Khalil 2 , Ashraf A. Mohamed 2
Affiliation  

The expanded use of radiations in diagnosis therapy, energy sectors, and various industries caused considerable concerns resulting from the increased exposure to ionizing radiations. Therefore, a series of tungsten-based composites (Bi2WO6, PbWO4, and Pb0.82Bi0.12WO4/W0.5Pb0.5Bi12O20) were synthesized, through One-Pot Hydrothermal Route, as effective protective barriers against gamma rays (γ-rays). The synthesized composite materials were characterized by XRD, Raman spectrometry, SEM-EDX-mapping, and density measurements. Various parameters were experimentally measured to determine the composites' viability as radiation shields, including linear attenuation coefficient (LAC), enhancement ratio, radiation protection efficiency, half-value layer, and mean free path. The narrow beam experimental gamma-photon transmission method was used to estimate the LAC's values for the synthesized composites using Cs-137 (with energies of 0.662 and 1.173 MeV) and Co-60 isotopes (with energy of 1.332 MeV). Among the investigated novel composites, the ternary composite (Pb0.82Bi0.12WO4/W0.5Pb0.5Bi12O20) proved to be the most efficient radiation shield. The MCNP-5 Monte Carlo simulation code and XCOM theoretical calculations data were in excellent harmony with the obtained experimental findings. The obtained results confirmed a strong relationship between the synthesized composites' chemical composition and their shielding capacity, where the ternary synthesized composite Pb0.82Bi0.12WO4/W0.5Pb0.5Bi12O20 with high lead-bismuth content has the highest LAC among the synthesized composites.



中文翻译:

钨酸铅铋复合材料作为伽马射线防护屏障

放射在诊断治疗、能源部门和各个行业中的广泛使用引起了人们对电离辐射暴露增加的极大关注。因此,一系列钨基复合材料(Bi 2 WO 6、PbWO 4和Pb 0.82 Bi 0.12 WO 4 /W 0.5 Pb 0.5 Bi 12 O 20) 被合成,通过一锅热液路线,作为有效的伽马射线 (γ 射线) 保护屏障。合成的复合材料通过 XRD、拉曼光谱、SEM-EDX 映射和密度测量进行表征。通过实验测量了各种参数,以确定复合材料作为辐射屏蔽的可行性,包括线性衰减系数 (LAC)、增强比、辐射防护效率、半值层和平均自由程。窄束实验伽马光子传输方法用于估计合成复合材料的 LAC 值,使用 Cs-137(能量为 0.662 和 1.173 MeV)和 Co-60 同位素(能量为 1.332 MeV)。在研究的新型复合材料中,三元复合材料 (Pb 0.82 Bi 0.12WO 4 /W 0.5 Pb 0.5 Bi 12 O 20 ) 被证明是最有效的辐射屏蔽。MCNP-5 蒙特卡罗模拟代码和 XCOM 理论计算数据与获得的实验结果非常吻合。所得结果证实了合成复合材料的化学成分与其屏蔽能力之间的密切关系,其中具有高铅铋含量的三元合成复合材料 Pb 0.82 Bi 0.12 WO 4 /W 0.5 Pb 0.5 Bi 12 O 20具有最高的 LAC合成的复合材料。

更新日期:2021-09-27
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