D-T中子源旋转靶活化计算与分析  

Activation calculation and analysis for rotary target chamber irradiated by D-T neutron

作　　者：高晖[1] 沈姚崧[2] 袁永刚[1] Gao Hui;Shen Yaosong;Yuan Yonggang(Institute of Nuclear Physics and Chemistry,CAEP,Mianyang 621999,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621999 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《强激光与粒子束》2018年第9期118-123,共6页High Power Laser and Particle Beams

摘　　要：为实现14 MeV D-T中子源旋转靶活化特性计算与分析,首次采用一种新的技术途径,将自主研发的活化程序BURNDOT与蒙特卡罗自动建模系统MCAM、蒙特卡罗粒子输运程序MCNP相结合,通过中子输运、材料活化、光子输运模拟计算的耦合,考察了材质、栅元、主要活化核素对靶室活化特性的影响。结果表明,约以辐照后68h为界,材料铜、316不锈钢先后作为旋转靶室活度的主要贡献者,前者其产生的缓发γ剂量因62 Cu,64 Cu核素的存在而达到活化剂量最大值,后者因有长半衰期核素55 Fe,57 Co,54 Mn等的存在,但其产生的剂量率值低于安全限值10μSv/h。采用新方法的计算结果与采用欧洲活化程序FISPACT-2007的计算结果符合较好。To realize the calculation and analysis for the neutron activation character of the 14 MeV D-T rotary target chain her, a new approach coupling the self-developed activation code BURNDOT with the Monte Carlo particle transport calculation code MCNP and the MCNP Automatic Modeling （MCAM） was developed, which integrates the functions of neutron transport, activation of materials and decay gamma transport. The influence of the factors including materials, cells and main activated nu clides on activation character of rotary target chamber at different time after the irradiation was analyzed in detail. The results show that the time about 68 h after neutron radiation acts as a boundary, before it the copper material is the major contributor for activity instead of the 316 stainless steel after it. For the former, the delayed y dose rate up to maximum is due to ^62Cu and ^64Cu, and for the latter, the delayed y dose rate is influenced by the long life time nuclides such as ^33Fe, ^57Co and ^54 Mn and it is under the level of 10 μSv/h. In addition, the results were compared with the data of the European activation code FISPACT 2007.

关 键 词：BURNDOT 旋转靶室 放射性活度 放射性核素 剂量率 

分 类 号：TL64[核科学技术—核技术及应用]