基于EGSnrc仿真的二维空气电离室剂量探测器收集电极影响研究  

Research on Influence of Collecting Electrode in Two-dimensional Air-ionization Chamber Dose Detector Based on EGSnrc

作　　者：邢桂来 谈春明[1,2] 王立强 XING Guilai;TAN Chunming;WANG Liqiang(Beijing Key Laboratory of Nuclear Detection ＆ Measurement,Beij ing 100084,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)

机构地区：[1]核检测技术北京市重点实验室,北京100084 [2]清华大学核能与新能源技术研究院,北京100084

出　　处：《原子能科学技术》2018年第7期1335-1340,共6页Atomic Energy Science and Technology

基　　金：清华大学自主科研计划资助项目(20151080374)

摘　　要：收集电极是二维空气电离室剂量探测器的重要组成部分,影响剂量测量的准确度。为了研究收集电极对剂量测量的影响规律,采用蒙特卡罗程序EGSnrc,分别在不同射线能量下对不同材质(C、Al、Cu)、不同收集电极厚度(5~70μm)进行模拟仿真,给出了影响规律的定量分析。结果表明,在工艺允许的情况下,应优先选择C作为收集电极材料;当只能采用Cu作为收集电极材料时,应采用工艺可达的最小厚度,并在使用中进行标定。The collecting electrode is an important part of the two-dimensional air-ionization chamber dose detector,which affects the accuracy of dose measurement.In order to study the influence of collecting electrode on dose measurement,the Monte Carlo program EGSnrc was used for simulation calculation.The simulation involved photons with different energy,different materials（C,Al,Cu）for collecting electrode and different thicknesses of the collecting electrode（5-70μm）.The quantitative analysis based on the simulation was given.The results show that carbon is the best choice for collecting electrode within the process condition.When the copper is the only choice,the thickness of the electrode should be as small as possible and the measurement results need to be corrected.

关 键 词：EGSNRC 二维空气电离室 收集电极 剂量探测器 

分 类 号：TL818[核科学技术—核技术及应用]