水下切伦科夫光光斑的蒙特卡罗模拟  

Monte Carlo simulation of Cherenkov light spot produced by underwater radioactive source

作　　者：刘斌[1] 贾清刚[1] 张天奎[1] 胡光[1] 胡华四[1] 

机构地区：[1]西安交通大学核科学与技术学院,西安710049

出　　处：《强激光与粒子束》2013年第1期196-200,共5页High Power Laser and Particle Beams

基　　金：国家高技术发展计划项目;国家自然科学基金项目(10975113)

摘　　要：分别采用分出截面法和积累因子法计算了水下放射性源透过一次屏蔽体的中子与γ射线的剂量场分布,并在这些分布条件下,利用Geant4软件γ射线在穿越二次屏蔽体后继而穿越后续水层,计算出在3m水层中产生的切伦科夫(Cherenkov)光通量分布和光谱分布。以纯水为传播介质,在考虑Cherenkov光在不同水层中传播所造成的几何衰减和水层吸收等因素后,由计算获得了Cherenkov光光斑大小和强度分布。The removal cross section method and the buildup factor method have been used to calculate the dose equivalent distribution of neutron and gamma rays permeating through the primary shielding layer of underwater radiator respectively. With this distribution, Cherenkov light spectrum and flux distribution in 3 m water layer radiator after 7-rays permeating through sec- ondary shielding layer and follow-up water layer have been simulated with Geant4. In addition, considering the geometry dilution and water attenuation for Cherenkov light propagating through some thickness of the pure water layer, the size of Cherenkov light spot and the intensity distribution were obtained.

关 键 词：放射源 切伦科夫辐射 分出截面法 积累因子法 Geant4模拟 

分 类 号：O536[理学—等离子体物理]