高剂量率脉冲γ辐射装置的建立  

Establishment of a High Dose Rate Pulsed Gamma Radiation Device

作　　者：方登富[1,2,3] 唐智辉 韦应靖 段嘉宇[1,2,3] 李胤 张婷婷 FANG Dengfu;TANG Zhihui;WEI Yingjing;DUAN Jiayu;LI Yin;ZHANG Tingting(China Institute for Radiation Protection,Taiyuan 030006,China;Shanxi Provincial Key Laboratory for Radiation Safety and Protection;China National Nuclear Corporation Key Laboratory of Radiation Protection Technology;Tsinghua University,Beijing 100084,China)

机构地区：[1]中国辐射防护研究院,山西,太原030006 [2]辐射安全与防护山西省重点实验室 [3]中核集团辐射防护技术重点实验室 [4]清华大学,北京100084

出　　处：《核电子学与探测技术》2025年第2期154-161,共8页Nuclear Electronics & Detection Technology

摘　　要：为解决临界事故报警设备的辐射性能测试问题,建立了基于稳态^(60)Co辐射切割的脉冲辐射装置。该装置建立在活度约为5000Ci的^(60)Co标准装置上,通过重力调节切割器的运动速度,利用切割器上预设的准直光阑切割稳态辐射以获得脉冲γ射线。经由蒙卡模拟明确了基本参数与实验设计,装置搭建完成后进行了各项测试。测得辐射特性如下:1)单脉冲的空气比释动能在136μGy~311μGy,测量重复性不超过1.3%;2)脉冲γ辐射在水平方向上的辐射野直径为10 cm,垂直方向的辐射野直径为9.5cm;3)脉冲γ辐射的脉冲宽度范围为80 ms~220 ms。该脉冲γ辐射装置的建立,可为临界事故报警设备的生产调试及运行监测提供测试平台。In order to solve the problem of radiation performance testing of warning equipment for criticality accidents,a pulse irradiation device based on steady-state ^(60)Co radiation cutting was established.The device was built on a ^(60)Co standard device with an activity of about 5000Ci.The moving speed of the cutter was adjusted by gravity,and the steady-state radiation was cut through the preset collimating aperture on the cutter to obtain pulsed gamma rays.The basic parameters and experimental design were clarified through the MCNP simulation,and various tests were carried out after the device was built.,the measured radiation characteristics were as follows:1)The air kerma of a single pulse was between 136μGy and 311μGy,and the measurement repeatability did not exceed 1.3%;2)The radiation field diameter of the pulsed gamma radiation in the horizontal direction was 10.0 cm,and the radiation field diameter in the vertical direction was 9.5cm;3)The pulse width of pulsed gamma radiation was in the range between from 80ms to 220ms.The establishment of the pulsedγradiation device could provide a test platform for the production debugging and operation monitoring of warning equipment for criticality accidents.

关 键 词：临界事故报警设备 脉冲γ辐射 稳态辐射场切割 辐射野 

分 类 号：TL84[核科学技术—核技术及应用]