EAST聚变装置上的金属材料活化研究  

Metal material activation research on EAST fusion facility

作　　者：韩良文 李凯 钟国强[1] 肖敏 徐宇 胡立群 HAN Liangwen;LI Kai;ZHONG Guoqiang;XIAO Min;XU Yu;HU Liqun(Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;University of Science and Technology of China, Hefei 230026, China)

机构地区：[1]中国科学院等离子体物理研究所,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《核技术》2019年第5期89-94,共6页Nuclear Techniques

基　　金：国家自然科学基金(No.11605241)资助~~

摘　　要：聚变实验装置停机后辐射剂量主要来源于各种金属材料的活化,分析活化材料产生的放射性核素,获得材料活化的原因及规律有助于确保装置维护期间人员剂量安全。利用先进实验超导托卡马克(Experimental Advanced Superconducting Tokamak,EAST)聚变实验装置对常用金属材料进行活化实验,结合总峰面积法、Wasson峰面积法和曲线拟合法对高纯锗γ谱仪所测能谱进行分析。结果表明:受照金属样品存在人工放射性核素,且这些核素的探测器计数率与样品辐照位置密切相关,通过比较发现Wasson峰面积法对弱峰峰面积具有较高的计算精度。若不考虑生物屏蔽墙的活化,EAST装置在当前运行参数条件下,停机后大厅内的辐射剂量主要由^(56)Mn、^(99)Mo、^(76)As、^(64)Cu、^(51)Cr、^(58)Co、^(59)Fe、^(54)Mn、^(60)Co等放射性核素贡献。[Background] The radiation dose mainly comes from the activation of different metal materials after fusion experimental facility shut down.[Purpose] This study aims to analyze the radionuclides generated by activated materials, so as to help ensure the safety of personal doses during equipment maintenance.[Methods] Activation experiments of the common metal materials were carried out. Associating with total peak area method, Wasson method and curve fitting method, the energy spectra measured by high purity germanium γ spectrometer were analyzed.[Results] The results show that the irradiated metal samples contain artificial radionuclides, and the detector count rate is closely related to the irradiation position. Wasson peak area method has higher computational accuracy for weak peak area compared with other two methods.[Conclusions] If the activation of the bio-shielded wall is not taken into account, the radiation dose in the hall of the EAST facility is contributed mainly by 56Mn, 99Mo, 76As, 64Cu, 51Cr, 58Co, 59Fe, 54Mn, 60Co and et al radionuclides after device shut down.

关 键 词：托卡马克 材料活化 放射性核素 

分 类 号：TL75[核科学技术—辐射防护及环境保护] TL62