基于金刚石超短超强激光脉冲X射线剂量仪研制  

Study on the diamond dose measurement device for X-rays generated from ultrashort and ultra-intense laser facility

作　　者：宋鸿鹄 武祯[1,2] 邱睿[1,2] 魏朔阳 宫辉[1,2] 张辉 李君利[1,2] SONG Honghu;WU Zhen;QIU Rui;WEI Shuoyang;GONG Hui;ZHANG Hui;LI Junli(Department of Engineering Physics,Tsinghua University,Beijing 100084;Key Laboratory of Particle&Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084)

机构地区：[1]清华大学工程物理系,北京100084 [2]粒子技术与辐射成像教育部重点实验室,北京100084

出　　处：《辐射防护》2023年第6期542-548,共7页Radiation Protection

基　　金：国家自然科学基金(面上项目)(11875036);国家自然科学基金(重点项目)(U2167209);清华大学自主科研项目。

摘　　要：基于金刚石探测器研制了脉冲X射线剂量测量仪,并对其性能进行进一步研究测试,使用蒙特卡罗软件FLUKA对测量仪进行了全装置建模,基于该模型完成了能量和角响应模拟。在中国计量科学院对仪器进行了实验校准,实验内容包括仪器对于^(137)Cs、^(60)Co的能量响应以及剂量率响应校准,以及仪器对于137 Cs的角响应校准,结果表明仪器输出电流与剂量率具有较好的线性,仪器未表现出明显的饱和现象,且仪器对137 Cs具有较好的角响应,最大差异不超过18%。基于3、6 MV电子脉冲加速器和“XG-III”等激光装置开展了相关验证实验,获得了与Unidos标准电离室、TLD较为一致的结果,最大误差分别为7%和36%。基于以上模拟和实验,进一步验证了本仪器应用于超短超强激光装置致脉冲辐射场剂量实时测量的可行性,为此类脉冲辐射场提供了剂量率测量手段。An active dose measurement device based on a diamond detector was developed by our research group,and its performance was further studied.Monte Carlo software FLUKA was used to model the device.Energy and angular response simulations were performed based on the model.The device was calibrated in China National Institute of Metrology.Energy response and dose rate response calibration of the device was conducted by using ^(137)Cs and ^(60)Co.^(137)Cs is used for the angular response calibration of the device.The results showed that the output current of the device was linear with the dose rate,and no obvious saturation phenomenon was observed.The device has a good angular response to^(137)Cs,with the maximum variation less than 18%.Related verification experiments were carried out based on 3 MV and 6 MV electron pulse accelerator and“XG-III”laser facility.The results given by the device were consistent with Unidos dosimeter and TLD detectors,with maximum deviation less than 7%and 35%,respectively.Based on the above simulation and experiments,the feasibility of applying this device to real-time dose measurement of pulsed radiation field induced by ultra-short and ultra-intense laser facility is further verified,which provides an alternative for dosimetric method of such pulsed radiation field.

关 键 词：超短超强激光 X射线 剂量 主动式 

分 类 号：TL817[核科学技术—核技术及应用] TL77