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实验室建立了满足国家量值溯源和传递要求的60Coγ射线参考辐射标准装置,主要用于治疗水平剂量计和防护仪表的检定与校准以及相关研究工作。文章首先介绍了60Coγ射线参考辐射标准装置的结构组成、物理原理及采用的技术路线;其次利用标准剂量仪测量不同源探距下的空气比释动能率,并测量源探距为1 500 mm处辐射场的均匀区大小,实验结果表明该辐照装置辐射场的空气比释动能率很好地符合平方反比定律,辐射场均匀区尺寸大于绝大多数剂量计的尺寸,该标准装置能够很好地满足应用需求。
The laboratory has established 60Coγ-ray reference radiation standard equipment that meets the requirements of national quantity traceability and transmission and is mainly used for the verification and calibration of horizontal dosimeters and protective meters as well as related research work. The article first introduces the structure, physical principle and technical route of 60Coγ-ray reference radiation standard device. Secondly, using standard dosimeter to measure the air kerma rate under different source probing distance, and measuring the source distance of 1 500 mm The experimental results show that the air kerma rate of the irradiation field of the irradiation device is in good agreement with the inverse square law and the size of the uniform radiation field is larger than the size of most dosimeters. The standard device can be very good To meet the application needs.