重金属元素粒径和重量百分比对增强聚合物复合材料光子屏蔽效率的影响

Q4 Health Professions
M. Asgari, H. Afarideh, H. Ghafoorifard, E. A. Amirabadi
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引用次数: 1

摘要

背景:以微米/纳米颗粒形式用重金属增强的聚合物复合材料是一种有效的γ和X射线屏蔽材料,与传统屏蔽相比,它具有成本效益、重量轻、灵活性、无毒性和适应性等优点。材料和方法:在本文中,使用MCNPX模拟和测量研究了增强复合材料(即铋/橡胶(Bi/R)和钨/橡胶(W/R)屏蔽)中铋和钨含量的重量百分比和颗粒尺寸对其对40至350keV光子能量的光子吸收能力的影响。通过将橡胶与不同重量百分比的铋和钨粉末混合,然后将其暴露于Euγ射线,制备了Bi/R和W/R聚合物复合材料。然后,测定了样品的屏蔽效率或光子透射分数、半值层(HVL)和tenthvale层(TVL)。结果:模拟结果证实,重元素的粒度对屏蔽效率起着重要作用,尤其是在低光子能量下。屏蔽材料的颗粒尺寸在每个重量百分比中的减小改善了辐射屏蔽特性。因此,研究结果支持了纳米复合材料应用于屏蔽低能量光子的可行性,特别是在乳腺X光检查等诊断研究中。结论:在低光子能量下,特别是在40keV左右,通过在聚合物基体中加入纳米重元素,可以显著降低光子通量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effects of particle size and weight percentage of heavy metal elements on photon shielding efficiency of reinforced polymer composites
Background: Polymer composites when reinforced with heavy metals in the form of micro/nano particles are efficient gammaand X-ray shielding materials providing such advantageous features as cost-effectiveness, lightweight factor, flexibility, non-toxicity, conformability over conventional shields. Materials and Methods: In this paper the influence of weight percentages and particle sizes of bismuth and tungsten contents of reinforced composites, i.e., bismuth/rubber (Bi/R) and tungsten/rubber (W/R) shields, in their photon absorption capabilities for photon energies, ranging from 40 to 350 keV, were investigated using both MCNPX simulations and measurements. The Bi/R and W/R polymer composites were prepared by mixing rubber with different weight percentages of bismuth and tungsten powders before exposing them to Eu gamma-rays. Then, the shielding efficiencies or photon transmission fractions, half-value layer (HVL) and tenthvalue layer (TVL) of the samples were determined. Results: The simulation results confirmed that the particle size of the heavy element plays an important role in the shielding efficiency, especially at low photon energies. The decrease in the particle size of shielding material in each weight percentage improved the radiation shielding features. Therefore, the results supported the feasibility of nano-sized composite applications for shielding against low-energy photons, especially in diagnostic studies such as mammography. Conclusions: At low photon energies, especially around 40 keV, a considerable decrease in photon flux was achieved by incorporating nano-sized heavy elements in a polymer matrix.
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来源期刊
Iranian Journal of Radiation Research
Iranian Journal of Radiation Research RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
0.67
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Iranian Journal of Radiation Research (IJRR) publishes original scientific research and clinical investigations related to radiation oncology, radiation biology, and Medical and health physics. The clinical studies submitted for publication include experimental studies of combined modality treatment, especially chemoradiotherapy approaches, and relevant innovations in hyperthermia, brachytherapy, high LET irradiation, nuclear medicine, dosimetry, tumor imaging, radiation treatment planning, radiosensitizers, and radioprotectors. All manuscripts must pass stringent peer-review and only papers that are rated of high scientific quality are accepted.
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