Gamma ray absorption of cylindrical fissile material with dual shields  

作　　者：WU Chen-Yan TIAN Dong-Feng CHENG Yi-Ying HUANG Yong-Yi LU Fu-Quan YANG Fu-Jia 

机构地区：[1]Institute of Mathematics, Fudan University, Shanghai 200433 [2]Institute of Modern Physics, Fudan University, Shanghai 200433 [3]Institute of Applied Physics and Computational Mathematics, Beijing 100088 [4]Department of Physics, University of Rhode Island, 02881-0817, USA

出　　处：《Nuclear Science and Techniques》2005年第5期266-272,共7页核技术（英文）

基　　金：This research project is supported by the Institute of Applied Physics and Computational Mathematics of China;the Foundation of Wang-Dao Scholar Program of Fudan University.

摘　　要：This work analyzed the gamma ray attenuation effect from the self-absorption and shield attenuation per-spectively. An exact mathematical equation was given for the geometric factor of the cylindrical fissile material with dual shields. In addition, several approximation approaches suitable for real situation were discussed, especially in the radial and axial directions of the cylinders, since the G-factors have simple forms. Then the space distribution patterns of the G-factor were analyzed based on numerical result and effective ways to solve the geometric informa-tion of the cylindrical fissile material, the radii and the heights, were deduced. This method was checked and verified by numerical calculation. Because of the efficiency of the method, it is ideal for application in real situations, such as nuclear safeguards, which demands speed of detection and accuracy of geometric analysis.This work analyzed the gamma ray attenuation effect from the self-absorption and shield attenuation perspectively. An exact mathematical equation was given for the geometric factor of the cylindrical fissile material with dual shields. In addition, several approximation approaches suitable for real situation were discussed, especially in the radial and axial directions of the cylinders, since the G-factors have simple forms. Then the space distribution patterns of the G-factor were analyzed based on numerical result and effective ways to solve the geometric information of the cylindrical fissile material, the radii and the heights, were deduced. This method was checked and verified by numerical calculation. Because of the efficiency of the method, it is ideal for application in real situations, such as nuclear safeguards, which demands speed of detection and accuracy of geometric analysis.

关 键 词：Γ射线 裂变反应 核反应堆 吸收能力 

分 类 号：TL352[核科学技术—核技术及应用] TL375.6