医用电子加速器中的光中子产额计算  

Photoneutron yields in medical electron accelerators

作　　者：李泉凤[1] 严慧勇[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2001年第6期27-29,33,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九五"科技攻关项目 (96-90 5 -0 1-0 3 )

摘　　要：计算了电子加速器中不同能量的电子垂直入射到钨靶和金靶上时的光中子产额。采用 Monte Carlo 程序EGS4对电子光子簇在靶中的输运进行模拟 ,计算出光子在靶中的径迹长度 ,从而求出光中子产额。对电子加速器钨靶和金靶中的光中子产额进行了计算 ,得到了电子加速器中光中子产额随打靶电子能量变化的规律及随靶厚度变化的规律 ,为加速器靶和屏蔽系统的设计提供依据 。Photoneutron yields are calculated for electrons from an accelerator with various energies vertically striking thick tungsten and aurum targets. EGS4, a Monte Carlo code, was used to simulate the transportation of electron photon clusters in the targets and the photon track lengthes were calculated by tracking the radiation photons to determine the photoneutron yields. This paper analyzes the photoneutron yields for tungsten and aurum targets in medical electron accelerators to determine the variation of photoneutron yields for various incident electron energies and target thicknesses. The results supply information for the design of targets and shielding systems and provide a basis for the analysis of photonentron yields and their distribution in composite targets.

关 键 词：光中子产额 阈能 光核反应 医用电子加速器 

分 类 号：TH774[机械工程—仪器科学与技术]