Tungsten-based material as promising new lead-free gamma radiation shielding material in nuclear medicine
Tungsten-based material as promising new lead-free gamma radiation shielding material in nuclear medicine
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DOI：
10.1016/j.ejmp.2020.08.017
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发表时间：
2020-10-01
影响因子：
3.4
通讯作者：
Zainon, Rafidah
中科院分区：
文献类型：
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作者：
AbuAlRoos, Nadin Jamal;Azman, Mira Natasha;Zainon, Rafidah
目的：评价碳化钨作为新型无铅辐射屏蔽材料在核医学中的应用效果。材料与方法：采用场发射扫描电子显微镜(FESEM)和能谱仪(EDX)对碳化钨的元素组成进行分析。碳化钨的纯度为99.9%，APS为40-50微米，制备了厚度分别为0.1 cm、0.5 cm和1.0 cm的碳化钨圆盘。用三种厚度相近的铅片与碳化钨片进行了衰减性能的比较。用I-12(3)、Ba-133、Eu-152和Cs-137进行了伽马能谱的能量刻度。来自这些源的伽马辐射以0.160 MeV到0.779 MeV的能量照射在这两种材料上。将铅和碳化钨的实验衰减系数与NIST数据库中这两种材料的理论衰减系数进行了比较。本研究还对两种材料的半值层和平均自由程进行了估算。结果：本研究发现伽马能谱所获得的峰与本研究所用的所有能量均呈线性关系。两种材料的质量衰减系数的实测值与理论值的相对误差均在0.19-5.11%之间。在不同能量下，碳化钨与铅相比，具有较低的半值层和平均自由程。结论：碳化钨作为一种新型的无铅辐射屏蔽材料在核医学中具有很高的潜力。
Purpose: The main objective of this study was to evaluate the efficacy of tungsten carbide as new lead-free radiation shielding material in nuclear medicine by evaluating the attenuation properties.Materials and methods: The elemental composition of tungsten carbide was analysed using Field-Emission Scanning Electron Microscopy (FESEM) with energy dispersive X-ray (EDX). The purity of tungsten carbide was 99.9%, APS: 40-50 mu m. Three discs of tungsten carbide was fabricated with thickness of 0.1 cm, 0.5 cm and 1.0 cm. Three lead discs with similar thickness were used to compare the attenuation properties with tungsten carbide discs. Energy calibration of gamma spectroscopy was performed by using I-12(3), Ba-133, Eu-152, and Cs-137. Gamma radiation from these sources were irradiated on both materials at energies ranging from 0.160 MeV to 0.779 MeV. The experimental attenuation coefficients of lead and tungsten carbide were compared with theoretical attenuation coefficients of both materials from NIST database. The half value layer and mean free path of both materials were also evaluated in this study.Results: This study found that the peaks obtained from gamma spectroscopy have linear relationship with all energies used in this study. The relative differences between the measured and theoretical mass attenuation coefficients are within 0.19-5.11% for both materials. Tungsten carbide has low half value layer and mean free path compared to lead for all thickness at different energies.Conclusion: This study shows that tungsten carbide has high potential to replace lead as new lead-free radiation shielding material in nuclear medicine.