探测器平面上的注量率分布计算方法  

Computation of fluence rate distribution on the radiation detector plane

作　　者：熊华[1] 范如玉[2] 康克军[1] 

机构地区：[1]清华大学工程物理系,北京100084 [2]西北核技术研究所,西安710024

出　　处：《清华大学学报（自然科学版）》2005年第3期392-395,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：注量率分布是球面源伽玛射线强度绝对测量的必需参数。通常使用的中心点公式只能用于探测器平面中心点注量率,而无法获得注量率分布。根据中心点公式,用微元法思想发展了一种计算任意点注量率的数值方法——Trueflux。计算表明:对中心点,Trueflux与中心点公式一致;对任意点,Trueflux与MonteCarlo通用程序MCNP的结果在3%以内符合。因此,Trueflux是一种计算任意点注量率的有效方法。The fluence distribution must be known for absolute gamma ray measurements in spherical radiation fields. The commonly used center formula is only defined for the center fluence rate and can not be used at random points. A new numerical method, called Trueflux, was developed by solving the center formula with the finite element analysis. Experiments show that Trueflux is consistent with the center formula at the center point, and that the fluence computed by Trueflux agrees with that of the MCNP (Monte Carlo N-particle code) within 3% at various points. Therefore, trueflux is an effective method for rapidly computing the fluence distribution.

关 键 词：探测器 注量率 球面源 伽玛射线 MCNP 

分 类 号：TL814[核科学技术—核技术及应用]