中子半影成像的数值模拟  

Numerical simulation of neutron penumbral imaging

作　　者：赵宗清[1] 丁永坤[2] 刘东剑[2] 唐昶环[2] 温树槐[2] 蒲以康[1] 

机构地区：[1]清华大学工程物理系,北京100084 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2006年第7期1203-1207,共5页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题

摘　　要：半影成像具有灵敏度高的特点,该技术是未来惯性约束聚变(ICF)中子成像的主要技术路线。基于中子半影成像的基本要求,利用蒙特卡罗方法,采用偏移抽样法和面通量的体通量替代技巧,模拟中子在半影成像系统中的输运,得到2维图像,并通过图像重建程序得到重建的源区图像。利用模拟结果,对编码孔屏蔽材料的选择和外径设计进行了初步优化,最终选择5 cm厚的钨屏蔽材料,其编码孔外径为1 cm。Penumbral imaging has high sensitivity, which will be the main technical method of neutron imaging in inertial confinement fusion （ICF） experiments. Based on the requirement of neutron penumbral imaging, two-dimensional image of neutrons transport in the coded aperture is simulated by Monte Carlo method, with the biased sampling skill and surface-flux replaced by volume-flux skill. The source image is obtained by reconstruction program. According to the simulation result, the 5 cm thick W bulk is selected as the shileding material and the optimized aperture outer radius is 1 cm.

关 键 词：半影成像 MCNP程序 编码孔 中子 

分 类 号：O571.523[理学—粒子物理与原子核物理] O532.13[理学—物理]