Design of a mixed material moderator in a beam-shaping assembly for proton accelerator-based boron neutron capture therapy

IF 1.6 3区 工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR
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Abstract

Boron Neutron Capture Therapy is being promoted with the development of accelerator neutron sources, and many new accelerator-based BNCT facilities are being built. In Particle Accelerator Facility project of Sun Yat-sen University, we plan to build a terminal for BNCT research based on an 8 MeV, CW 3 mA proton accelerator. In this paper, we present a beam-shaping assembly for this proton accelerator with such low 24 kW beam power, using composite moderator materials composed of five elements: Mg, Al, F, O, and Li. The calculation result of FLUKA with ENDF/B and JENDL libraries shows that the epithermal neutron beam flux is 1.57×109n/cm2/s with the CW 3 mA proton beam. The fast neutron component and the gamma ray component under free-air condition are 1.49×1013Gycm2 and 8.12×1014Gycm2 respectively, in line with IAEA-TECDOC-1223 design recommendations. The thermal analysis shows that the maximum temperature of beryllium target is 706.5 K, and the structure materials of BSA do not melt.

设计基于质子加速器的硼中子俘获疗法的束流整形组件中的混合材料慢化剂
随着加速器中子源的发展,硼中子俘获疗法正在得到推广,许多新的基于加速器的硼中子俘获疗法设施正在建设中。在中山大学的粒子加速器设施项目中,我们计划建造一个基于 8 MeV、CW 3 mA 质子加速器的 BNCT 研究终端。在本文中,我们介绍了该质子加速器的束流整形组件,其束流功率低至 24 kW,使用由五种元素组成的复合慢化剂材料:Mg、Al、F、O 和 Li 五种元素组成的复合慢化剂材料。利用ENDF/B和JENDL库进行的FLUKA计算结果表明,在CW 3 mA质子束下,表热中子束通量为1.57×109n/cm2/s。自由空气条件下的快中子分量和伽马射线分量分别为 1.49×10-13Gy∙cm2 和 8.12×10-14Gy∙cm2,符合 IAEA-TECDOC-1223 的设计建议。热分析表明,铍靶的最高温度为 706.5 K,BSA 的结构材料不会熔化。
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来源期刊
Applied Radiation and Isotopes
Applied Radiation and Isotopes 工程技术-核科学技术
CiteScore
3.00
自引率
12.50%
发文量
406
审稿时长
13.5 months
期刊介绍: Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.
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