电子辐照灭菌中剂量深度分布的分析  

Dose-depth distribution during sterilization with electron radiation

作　　者：刘志弢[1] 张化一[1] 唐华平[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）》2005年第6期806-809,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为研制加速器电子束邮件灭菌安全系统,用MonteCarlo(MCNP)程序模拟计算了4.5MeV电子束辐照复印纸和聚苯乙烯时吸收剂量随深度的变化。计算分析了邮件灭菌中电子束的能量、入射角度、复印纸厚度及上下铝衬底材料等对辐照效果的影响。结果表明,受照物质中的吸收剂量呈先增后减的趋势;电子束能量越高,穿透深度越大,吸收剂量峰值变低;入射角度变化,穿透深度不变;衬底材料可提高受照物质上表面的吸收剂量。结果与实验符合,验证了模拟的可信性,也显示出MCNP计算的速度快、效率高、应用灵活等优点。The dose-depth distribution in duplicating paper and polystyrene were calculated using a Monte Carlo N-Particle (MCNP) code to develop a mail sterilization system using radiation from linear electron accelerators. The initial electron energy was assumed to be 4.5 MeV. Factors such as electron energy, radiation angle, paper thickness, and base plates all influence the irradiation effects. The calculated results show that the absorption dose decreases after first increasing. Higher electron energy penetrate deeper into the materials, but the radiation angle does not affect the penetration depth. Base plates can raise the absorption dose near the upper surface of the irradiated material. The calculated results agree well with experimental results, verifying the accuracy of the MCNP simulation.

关 键 词：直线电子加速器 电子辐照 灭菌 MONTE Carlo程序(MCNP) 剂量深度分布 复印纸 

分 类 号：TL53[核科学技术—核技术及应用]