Estimation of reliable displacements-per-atom based on athermal-recombination-corrected model in radiation environments at nuclear fission, fusion, and accelerator facilities
Estimation of reliable displacements-per-atom based on athermal-recombination-corrected model in radiation environments at nuclear fission, fusion, and accelerator facilities
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DOI：
10.1016/j.jnucmat.2020.152261
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发表时间：
2020-09-01
影响因子：
3.1
通讯作者：
Hashimoto, Shintaro
中科院分区：
文献类型：
--
作者：
Iwamoto, Yosuke;Meigo, Shin-ichiro;Hashimoto, Shintaro
每原子位移(Dpa)被广泛用于预测材料在辐射环境中的工作寿命的曝光单位。由于非热复合修正DPA(ARC-DPA)模型是一个比标准NorgetteRobinsoneTorrens(NRT)模型更接近实际的模型，因此将以ARC-DPA模型为标准对核裂变、聚变和加速器设施中各种应用的辐射损伤进行新的评估。确定从NRT-DPA模型到ARC-DPA模型的各种应用的重新比例因子也很重要。本文在粒子和重离子传输程序系统(PHITS)中加入了包括C、Al、Si、Fe、Cu和W在内的各种材料的ARC-DPA模型，并报道了在较宽的能量范围内的重标度因子(NRT-DPA/ARC-DPA)。对于在选定的核设施中确定能谱的中子入射和能量为600 MeV-50GeV的质子入射，每种材料的重新标度因子与这些辐照条件无关，每种材料的值几乎相同。该值主要由损伤能区损伤产生效率在约1keV以上的饱和程度决定。我们的发现将有益于在各种设施的广泛能量区域内重新调整用于辐射损伤应用的NRT-DPA。(C)2020作者。Elsevier B.V.出版。这是一篇基于CC by License(http://creativecommons.org/licenses/by/4.0/).的开放获取文章
The displacements-per-atom (dpa) is widely used as an exposure unit to predict the operating lifetime of materials in radiation environments. Because the athermal-recombination-corrected dpa (arc-dpa) model is a more realistic model than the standard NorgetteRobinsoneTorrens (NRT) model, new evaluation of radiation damage for various applications at nuclear fission, fusion, and accelerator facilities will be performed using the arc-dpa model as a standard. Determination of the rescaling factor from the NRT-dpa to arc-dpa model for various applications is also important. In this work, the recent arc-dpa model of various materials including C, Al, Si, Fe, Cu, and W are incorporated in the Particle and Heavy Ion Transport code System (PHITS), and the rescaling factors (NRT-dpa/arc-dpa) over a wide energy range are reported. For neutron incidences with the energy spectrum determined in selected nuclear facilities and proton incidences with energies of 600 MeV-50 GeV, the rescaling factor for each material is independent of these irradiation conditions with almost the same value for each material. This value is mainly determined by the saturation in the damage production efficiency in the damage energy region over approximately 1 keV. Our findings will be beneficial for rescaling the NRT-dpa used for radiation damage applications over a wide energy region at various facilities. (c) 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).