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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
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
关键词
半影成像
MCNP程序
编码孔
中子
Penumbral imaging technique
MCNP
Coded aperture
Neutron
