杭州市部分非医疗机构辐射水平分析

目的 了解杭州市部分非医疗机构辐射防护现状，为相关主管部门制定非医疗机构放射性危害因素监测规划提供依据和参考。方法 采用问卷调查和现场检测相结合的方式对杭州市5家非医疗监测机构的人员防护用品配置及放射源和射线装置的辐射水平进行调查与分析。结果 5家监测机构均已开展个人剂量监测，且个人年剂量当量满足国家相关标准的要求；放射源和射线装置机房周围剂量当量率检测结果均低于检测仪器的最低探测下限；储源状态时，距源容器外表面5 cm 和100 cm处的最大周围剂量当量率值分别为22.2 μSv/h和2.0 μSv/h；源使用状态时，距源容器外表面5 cm 和100 cm处的最大周围剂量当量率值分别为44.3 μSv/h和5.0 μSv/h。结论 正常运行状态下，杭州市部分非医疗监测机构的放射源和射线装置所产生的辐射剂量水平处于低水平状态，但部分距源容器外表面周围剂量当量率值处于较高水平，非医疗机构需提高辐射防护意识，加强辐射管理工作。

Radiation level analysis of some non-medical institutions in Hangzhou

Objective The purpose of this study is to grasp the current situation of radiation protection in some non-medical institutions in Hangzhou, and to provide basis and reference for the relevant authorities departments to make the radioactive hazard factors monitoring plan for non-medical institutions.Methods The configuration of the personnel protective equipment and radiation level of radiation sources and radiation devices in 5 non-medical monitoring institutions in Hangzhou were investigated and analyzed by means of questionnaire survey and on-site detection.Results The radiation workers of 5 monitoring institutions have carried out personal dose monitoring, and their annual individual dose equivalent meets the requirements of relevant national standards. The ambient dose equivalent rates around the radiation source and radiation device room are lower than the minimum detection limit of the instrument. When the source is stored, the maximum ambient dose equivalent rates at 5 cm and 100 cm away from the external surface of the source container were 22.2 μSv/h and 2.0 μSv/h, respectively. When the source is in use, the maximum ambient dose equivalent rates at 5 cm and 100 cm away from the external surface of the source container were 44.3 μSv/h and 5.0 μSv/h, respectively.Conclusion Under normal operation, the radiation dose level of some non-medical monitoring institutions in Hangzhou is at a low level, while the ambient dose equivalent rates around the external surface of the source container is at a high level. Therefore, non-medical institutions should improve their awareness of radiation protection and strengthen radiation management.