A Comprehensive study of the exposure and energy absorption buildup factors in some polymer composites for point isotropic Source, including the effect of bremsstrahlung

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2024-11-01 DOI:10.1016/j.nimb.2024.165552

Keyhandokht Karimi-Shahri , Yasaman Rezaei Moghaddam , Parisa Akhlaghi , Najmeh Mohammadi , Atiyeh Ebrahimi-Khankook

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Abstract

The exposure (EBF) and energy absorption buildup factors (EABF) of different polymer composites (SiW, PHEMA-WO₃, CaWO₄, EWO₃, BaTiO₃, PbCl₂) has been investigated for photon isotropic source with the energy range of 0.015–15 MeV and the penetration depth of 1–10 mean free path(mfp). Furthermore, the contribution of bremsstrahlung effect on selected polymer composites EBF has been discussed. Simulations were performed by MCNPX Monte Carlo code. Model validation was carried out by comparing theoretical uncollided flux and EBF of water with similar published data. The results indicate that EBF and EABF values are dependent on the incident photon energy and the depth of penetration. The maximum and minimum values of EBF and EABF are related to BaTiO₃ and SiW, respectively. Moreover, it is observed that considering bremsstrahlung increases values, especially at energies greater than 3 MeV.

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点各向同性源某些聚合物复合材料的暴露和能量吸收累积因子综合研究，包括轫致辐射的影响

研究了不同聚合物复合材料（SiW、PHEMA-WO3、CaWO4、EWO3、BaTiO3、PbCl2）在能量范围为 0.015-15 MeV、穿透深度为 1-10 平均自由路径（mfp）的光子各向同性源下的暴露（EBF）和能量吸收积累因子（EABF）。此外，还讨论了轫致辐射效应对选定聚合物复合材料 EBF 的贡献。模拟采用 MCNPX 蒙特卡罗代码进行。通过将水的理论非碰撞通量和 EBF 与已发表的类似数据进行比较，对模型进行了验证。结果表明，EBF 和 EABF 值取决于入射光子能量和穿透深度。EBF 和 EABF 的最大值和最小值分别与 BaTiO3 和 SiW 有关。此外，还观察到轫致辐射会增加数值，尤其是在能量大于 3 MeV 时。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms 物理-核科学技术

CiteScore

2.80

自引率

7.70%

发文量

231

审稿时长

1.9 months

期刊介绍： Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.