圆柱形裂变材料核装置的γ自吸收  

The γ-ray Self-absorption of Cylindrical Fissile Material

作　　者：陆福全[1] 田东风[2] 吴师民[1] 杨福家[1] 

机构地区：[1]复旦大学现代物理所,上海200433 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《复旦学报（自然科学版）》2001年第3期245-248,共4页Journal of Fudan University：Natural Science

摘　　要：圆柱形裂变核材料2 3 5U或2 3 9Pu装置中各点所发射的γ射线到达探测器前经过材料自身的吸收距离没有球对称性 .通过对吸收的几何分析 ,获得了在与圆柱轴垂直方向上的自吸收修正因子的分析表达式 .由于γ吸收系数 μ是γ能量的函数 ,由此可以计算出不同能量γ的强度比与γ出射方向的关系 ,从而可以获得核装置本身的几何形状和大小的信息 .这一研究对有关核材料的监控。The self absorption of γ ray emitted from cylindrical fissile materials, such as 235 U and 239 Pu, does not possess spherical symmetry. An analytical formula of self absorption for γ ray in the direction perpendicular to the axis of a cylinder has been obtained. The blanching ratio of different energy γ rays is a function of γ ray outgoing direction, accordingly one can acquire the information about geometrical configuration of cylindrical fissile materials. The result can be applied to the fissile material safeguard, such as nuclear monitoring and verifying.

关 键 词：裂变材料 核监控 γ射线自吸收 

分 类 号：O571.1[理学—粒子物理与原子核物理] O571.33[理学—物理]