15MV电子加速器机头感生放射性的Monte Carlo计算  

Monte Carlo calculation of induced radioactivity for a 15-MV electron accelerator head structure

作　　者：李文茜[1] 李君利[1] 邱睿[1] 任丽[1] 

机构地区：[1]清华大学工程物理系,粒子技术与辐射成像教育部重点实验室,高能辐射成像国防重点学科实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2011年第8期1102-1106,1111,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(10775084)

摘　　要：加速器停机后的感生放射性是工作人员所受内外照射的首要来源。Monte Carlo模拟计算是进行感生放射性预测分析的重要方法之一。该文应用Monte Carlo软件FLUKA对同方威视技术股份有限公司一台15MV电子加速器的机头屏蔽结构进行了模拟。给出了2个测点的吸收剂量率和周围剂量当量率随冷却时间的变化曲线及其与实验测量结果的对比,并给出了各个区域放射性核素产额随时间的变化。模拟计算与实验测量的结果在量级和衰减趋势上吻合。该文提供了一种通过Monte Carlo模拟预测感生放射性问题的方法,也可应用于其他高能粒子加速器的活化分析。The induced radioactivity after the accelerator shut-down is the principal source of the inner and outer irradiation of the personnel. The Monte Carlo simulation is one of the important methods for forecasting and analyzing the induced radioactivity. A 15-MV electron accelerator head shielding structure of the NUCTECH Company was simulated using the Monte Carlo software, FLUKA .The absorption close rate and ambient dose equivalent rate changes with the cooling time at two interest positions were calculated and compared with the experimental data, with the radionuclide inventory variations with time in every region also listed. Simulation results agree well with the measured results in order of the magnitude and attenuation trend. The developed method in this paper can forecast the induced radioactivity problem by Monte Carlo simulation and can also be used in the activation analysis of other high-energy particle accelerators.

关 键 词：感生放射性 MONTE CARLO模拟 电子加速器 剂量 活度 

分 类 号：TL752[核科学技术—辐射防护及环境保护]