国产QF-60型电离室剂量特性测量与评价  

Measurement and Evaluation of Dosimetric Characteristics for Domestic QF⁃60 Type Ionization Chamber

作　　者：李毅华[1] 韩佳乐 王坤[2] 王志鹏[2] 金孙均[2] 刘一静 LI Yihua;HAN Jiale;WANG Kun;WANG Zhipeng;JIN Sunjun;LIU Yijing(College of Mechanical and Electrical Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China;National Institute of Metrology,Beijing 100029,China;Beijing Pulinkang Technology Co.,Ltd.,Beijing 102206,China)

机构地区：[1]安徽理工大学机电工程学院,安徽淮南232001 [2]中国计量科学研究院,北京100029 [3]北京普林康科技有限公司,北京102206

出　　处：《计量学报》2025年第3期419-425,共7页Acta Metrologica Sinica

基　　金：国家重点研发计划(2023YFF0613503);国家市场监督管理总局质量技术基础能力建设专项(ANL2402)。

摘　　要：医用加速器光子束剂量校准中电离室过度依赖进口,而国产探测器在放疗应用中缺乏系统实验。通过对国产QF-60型指型电离室的角响应、复合极化修正、漏电流、剂量线性和能量响应等剂量学参数在高能光子束下的定量测量,并参照JJG912-2010治疗水平电离室剂量计的性能要求,给出QF-60探测器的使用建议。结果表明:该探测器的角响应最大影响为0.88%,同型号的重复性为0.21%;极化修正因子为1.001;常规放疗剂量率范围下的离子复合修正值均小于1.004 9;漏电流,剂量线性等基本满足JJG912-2010规定要求;6 MV、10 MV、25 MV光子相对于~(60)Co γ射线的能量响应为0.988 3、0.982 0、0.959 7,同型号最大相对偏差为0.17%。然而由于缺乏对位刻线,使用中应注意角响应的影响,测量中也应及时充分预照射,并应定期进行~(60)Co γ射线水吸收剂量和能量响应校准。In the photon beam dose calibration of medical accelerators,the ionization chamber is excessively dependent on imports,and the domestic detector lacks systematic experiments in radiotherapy applications.Through the quantitative measurement of dosimetric parameters such as angular response,composite polarization correction,leakage current,dose linearity and energy response of domestic QF-60 series farmer ionization chamber in high-energy photon beams,and referring to the performance requirements of JJG912-2010 therapeutic horizontal ionization chamber dosimeter,the use suggestions of QF-60 detector are given.The results show that the maximum impact of the angular response of the detector is 0.88%,and the repeatability of the same model is 0.21%.The polarization correction factor is 1.001.The ion composite correction values in the dose rate range of conventional radiotherapy are less than 1.0049.The leakage current and dose linearity basically meet the requirements of JJG912-2010.The energy response of 6 MV,10 MV,25 MV photons relative to 60Coγ-rays is 0.9883,0.9820,0.9597,and the maximum relative deviation of energy and noise of the same model is 0.17%.However,due to the lack of alignment lines,attention should be paid to the influence of angular response during use,timely and sufficient pre-irradiation should be conducted in the measurement,and the 60Coγ-ray water absorption dose and energy response calibration should be conducted regularly.

关 键 词：电离辐射计量 指型电离室 剂量校准 能量响应 角响应 

分 类 号：TB98[一般工业技术—计量学]