摘要
针对空间站辐射监测中CR-39探测器无法有效区分α粒子与质子而导致个人剂量评估偏差大的问题,为实现粒子的精准甄别,本文采用Geant4工具包与Track程序开展模拟研究。依据径迹蚀刻动力学理论,利用Geant4模拟粒子输运物理过程,并通过Track程序模拟化学蚀刻与径迹形貌演化;系统研究了1~10 MeV能量范围内α粒子与质子在CR-39中的射程、阻止本领及径迹参数,并确定了最佳蚀刻条件。模拟结果表明,相同能量下α粒子射程仅为质子的1/4.5~1/10.5,阻止本领高达3.7~5.5倍;在相同蚀刻条件下,两者径迹形态差异显著,α粒子径迹呈黑色圆形,而质子径迹为灰色圆形,且前者的直径与深度均显著大于后者。本文建立了基于Geant4与Track的CR-39全流程模拟方法,实现了α粒子与质子的有效甄别,为解决空间辐射剂量监测中的粒子区分难题提供了关键理论依据和技术支持。
Personal dose assessments on space stations may be inaccurate because of poor discrimination between alpha particles and protons in CR-39 detectors used on these stations.To address these inaccuracies,simulations were conducted using Geant4 and Track.Based on track etching kinetics,Geant4 simulated physical particle transport,while Track simulated chemical etching and track evolution.The range,stopping power,and track parameters of 1~10 MeV alpha particles and protons in CR-39 were systematically analyzed,and the optimal etching conditions were determined.The results show that the range of alpha particles is only 1/4.5~1/10.5 that of protons at the same ener-gy,whereas the stopping power of alpha particles is 3.7~5.5 times higher.The track morphologies of alpha particles and protons are distinct under identical etching conditions:alpha tracks are presented as black circles with remark-ably larger diameters and depths,whereas proton tracks are gray.This study established a full-process simulation method for CR-39 detectors using Geant4 and Track,enabling effective discrimination between alpha particles and protons and providing key theoretical and technical support for space radiation monitoring.
作者
张琪
宋玉收
曹勤剑
卫晓峰
ZHANG Qi;SONG Yushou;CAO Qinjian;WEI Xiaofeng(College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China;China Institute for Radiation Protection,Taiyuan 030006,China;Shanxi Key Laboratory of Radiation Safety and Protection,Taiyuan 030006,China;Key Laboratory of Radiation Protection Technology,China National Nuclear Corporation,Taiyuan 030006,China)
出处
《哈尔滨工程大学学报》
北大核心
2025年第11期2233-2241,共9页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(12227810)。
