辐射生物效应纳剂量探测器参数设计研究  

Research on parameter design of radiation biological effect nanodosimeter

作　　者：龚雨程 黄骥[2] 吴国新[1] 王坤[2] 邱睿[3] Gong Yucheng;Huang Ji;Wu Guoxin;Wang Kun;Qiu Rui(College of Mechanical Engineering,Beijing Information Science and Technology University,Beijing 100096,China;Division of Ionizing Radiation Metrology,National Institute of Metrology,Beijing 100029,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京信息科技大学机电工程学院,北京100096 [2]中国计量科学研究院电离辐射计量科学研究所,北京100029 [3]清华大学工程物理系,北京100084

出　　处：《电子测量技术》2025年第2期7-13,共7页Electronic Measurement Technology

基　　金：国家重点研发计划(2021YFF0603600)项目资助。

摘　　要：纳剂量学通过统计初始粒子电离的离子数量与种类等物理量来模拟辐射生物效应。微孔道电离离子计数的纳剂量探测器通过配置内电场驱动电离离子漂移进入微孔道,并在强压下诱导电子雪崩实现测量。本文针对纳剂量准确测量需求,开展基于有限元分析与蒙特卡洛方法的微孔道电离离子计数纳剂量探测器参数设计研究。利用COMSOL有限元分析与Garfield++蒙特卡洛软件,对探测器内部静态电场、电离离子动态输运以及微孔道内电子雪崩形成进行计算与模拟,系统研究了不同阳极、阴极电场配置下内部电场漏斗效应的形成特性,分析了其对电离离子动态输运和收集效率的影响规律,研究了电子雪崩对电场配置、微孔道直径等设计参数的依懒性,并对结果进行讨论与归纳。分析结果表明,阳极电压选取5~15 V,阴极电压选取-1500~-2000 V,微孔道半径选取0.5~0.75 mm可实现较好测量性能。本文的研究结果将为深入了解纳剂量探测器的内部工作机制及参数设计优化提供重要的理论依据。Nanodosimetry simulates the biological effects of radiation by measuring physical quantities,such as ions that are ionized by initial particles.The microchannel ionized ion counting nanodosimeter can measure ionized ions by utilizing an internal electric field to drive them into the microchannel,where they induce an electron avalanche under high voltage.This paper studies the parameter design of a nanodosimeter utilizing microchannel ionized ion counting,based on finite element analysis and the Monte Carlo method.COMSOL finite element analysis and Garfield++Monte Carlo software are utilized to calculate and simulate the static electric field,the dynamic transport of ionized ions,and the formation of electron avalanches in microchannels.The characteristics of the internal electric field funnel effect were systematically studied under various anode and cathode electric field configurations.Additionally,the impact of these configurations on the dynamic transport and collection efficiency of ionized ions was analyzed.The dependence of electron avalanche on design parameters,such as electric field configuration and microchannel diameter,is examined,and the results are discussed and summarized.The analysis results indicate that selecting an anode voltage of 5~15 V,a cathode voltage of-1500~-2000 V,and a microchannel diameter of 0.5~0.75 mm can achieve good measurement performance.The research findings presented in this article will provide a crucial theoretical foundation for a deeper understanding of the internal mechanisms and parameter design optimization of nanodosimeters.

关 键 词：纳剂量探测器 COMSOL有限元分析 Garfield++蒙特卡洛方法 

分 类 号：TL818[核科学技术—核技术及应用] TH89[机械工程—仪器科学与技术] TN06[机械工程—精密仪器及机械]