质子吸收剂量校准中蒙特卡罗方法的应用  

Application of Monte Carlo Method in Calibration Technology of Proton Absorbed Dose

作　　者：王风[1] 林敏[1] 徐利军[1] 陈义珍[1] 崔莹[1] 夏文[1] 陈克胜[1] 李华芝[1] 叶宏生[1] 

机构地区：[1]中国原子能科学研究院放射性计量测试部,北京102413

出　　处：《原子能科学技术》2011年第10期1270-1274,共5页Atomic Energy Science and Technology

摘　　要：在使用法拉第筒校准丙氨酸剂量计质子吸收剂量的实验中,质子会受到管道和器壁等物质的影响,造成实验测量结果偏差。为提高测量的准确性,使用FLUKA蒙特卡罗软件,模拟质子在管道中的输运过程。结果表明,加入Ta散射膜后,质子束能均匀地辐照并覆盖丙氨酸剂量计。穿过丙氨酸剂量计的质子数略大于法拉第筒测量值,模拟计算得到测量修正因子k=1.014。模拟计算了丙氨酸剂量计中的质子能谱分布,随后计算了丙氨酸剂量计的平均碰撞阻止本领。通过模拟计算和修正,获得了更准确的实验数据,最终得到丙氨酸剂量计质子辐照校准曲线,线性相关系数为0.999 5。In the experiment using Faraday cup to calibrate absorbed dose of proton in alanine dosimeter,it is necessary to consider the influence of pipes,wall and other matters.To improve the accuracy of measurement,FLUKA Monte Carlo software was employed to simulate proton transport in pipes.Simulation results prove that alanine dosimeters can be irradiated uniformly if proton beam is passed through the Ta scatter film.The actual number of proton passed through alanine dosimeter is a little greater than determination by the Faraday cup.Modifying factor is gained which is 1.014.Proton energy spectrum distribution was simulated.And the average collision stopping power of proton in alanine dosimeter was calculated subsequently.Through simulation and modification,more accuracy experiment data were gained.The calibration curve of alanine dosimeter irradiated by proton was obtained at last.The linear coefficient is 0.999 5.

关 键 词：蒙特卡罗 FLUKA 质子吸收剂量 法拉第筒 丙氨酸剂量计 

分 类 号：TL818[核科学技术—核技术及应用]