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核救灾机器人对核事故现场救援和灾后处理具有重要意义,而核救灾机器人的电子器件易因受γ射线照射而失效,材料屏蔽的方法可提高电子器件的耐辐射性能。本文综合考察了Ni-W、W-Ni及钨镍合金三种复合结构模型的屏蔽性能。采用蒙特卡罗方法分别计算了不同材料厚度、元素体积比和屏蔽层数下三种模型的γ射线透射能谱。结果发现:采用Ni-W或钨镍合金方式的屏蔽效果较好,特别是在低能范围(0-0.6 Me V)优势更加明显。钨含量增加后三种模型的屏蔽结果趋近。同时,层数变化和辐照源为单向面源或单向点源对屏蔽结果影响不大。
Nuclear disaster relief robots are of great importance to on-site rescue and post-disaster treatment of nuclear accidents. Electronic devices of nuclear disaster-relief robots are often ineffective due to γ-ray irradiation. Material screening methods can improve the radiation resistance of electronic devices. In this paper, the shielding properties of three composite structures of Ni-W, W-Ni and tungsten-nickel alloy were comprehensively investigated. The Monte Carlo method was used to calculate the γ-ray transmittance spectra of the three models with different material thicknesses, elemental volume ratios and shielding layers respectively. The results show that the shielding effect of Ni-W or tungsten-nickel alloy is better, especially in the low energy range (0-0.6 MeV). The shielding results of the three models approached with the increase of tungsten content. At the same time, the changes of the number of layers and the irradiation source are unidirectional or unidirectional sources, which have little effect on the shielding results.