中子厚针孔成像数值计算  

Numerical Calculation of Neutron Pinhole Image(In Chinese)

作　　者：杨建伦[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《中国核科技报告》2009年第1期104-113,共10页China Nuclear Science and Technology Report

摘　　要：为了计算中子厚针孔准直器的成像质量、点扩散函数、像面中子注量分布等,可利用MCNP5程序通过计算位于像面处的点探测器阵列的中子点通量分布来实现,但这种计算耗时较长,且计算得到的图像数据的统计涨落较大。研究了中子经过厚针孔准直器后在像面处的直穿中子注量分布快速计算方法,并据此建立了中子厚针孔成像快速计算程序WINPSF,其计算结果与MCNP5计算结果相符,而在计算速度和计算结果的统计特性等方面均优于MCNP5。A new numerical method based on calculating spatial distribution of transmitted neutron intensity is studied for the design of neutron pin-hole relaying system,and WINPSF code is then developed for calculating image quality, point spread function,as well as neutron flux distribution at the image plane.It indicates that the results given by WINPSF agree well with those given by MCNP5,and WINPSF can give results in better statistical quality in shorter computer time than MCNP5.

关 键 词：中子针孔照相 点扩散函数 

分 类 号：O571.5[理学—粒子物理与原子核物理]