计量测试部为北京市射线应用研究中心研制了一套防护水平γ射线照射装置,可安装最大活度为10Ci的60Co放射源,如图1所示。空气比释动能率最高可达约100mGy/h,1m处辐射场大小为φ30cm,有效工作距离0.7～6.0m。该照射装置用以产生准直参考辐射,设计满足国家标准GB/T12162.1—2000《用于校准剂量仪和剂量率仪及确定其能量响应的X和γ参考辐射第一部分:辐射特性及产生方法》推荐的准直几 The Measurement and Testing Department has developed a set of protection level γ-ray irradiation equipment for Beijing Radiation Application Research Center, which can install a 60Co radioactive source with a maximum activity of 10Ci, as shown in Figure 1. Air kerma rate up to about 100mGy / h, 1m radiation field size of φ30cm, the effective working distance of 0.7 ~ 6.0m. The irradiation device is used to generate collimated reference radiation and is designed to meet the requirements of the national standard GB / T12162.1-2000 “X and γ reference radiation for calibrating dosimeters and dose rate meters and determining their energy response Part 1: Radiation characteristics and generation Method ”recommended a few collimation