2014—2017年南通市放射工作人员外照射个人剂量监测结果分析

目的 了解2014—2017年南通市放射单位不同年份和不同工种放射工作人员职业外照射的剂量水平及分布情况，为放射防护管理工作提供科学依据，预防放射性职业病的发生。方法 按照外照射个人剂量监测规范，每季度对放射工作人员进行剂量监测，职业类别包括诊断放射学（2A）、介入放射学（2E）、核医学（2C）、牙科放射学(2B)、放射治疗（2D）、工业辐照(3A)、工业探伤(3B)等，使用全国放射卫生信息平台个人监测管理系统对监测数据进行汇总统计。结果 4年共监测放射工作人员6 465人次，人均年有效剂量为0.28 mSv/a，年有效剂量低于探测下限MDL组的有654人次，占10.12%；年有效剂量位于MDL~1mSv组的有5 619人次，占86.91%；4年集体有效剂量共为1.83 Sv，其中MDL～1mSv组集体有效剂量共为1.46 Sv。核医学人均年有效剂量0.56 mSv /a，高于其他职业类别监测结果，介入放射学0.44 mSv/a，放射治疗最低，为0.21 mSv/a，诊断放射学人均年有效剂量为0.27 mSv /a，对集体有效剂量贡献最大。结论 根据GB 18871—2002《电离辐射防护与辐射源安全基本标准》，所监测的放射工作人员剂量均远低于剂量限值20 mSv，放射工作人员工作环境处于安全、稳定状态，辐射防护条件较好。

Analysis on monitoring individual does results of external exposure of radiation workers in Nantong City from 2014 to 2017

Objective To understand the dose level and distribution of occupational external exposure among radiation workers in different years and different types of work in Nantong city from 2014 to 2017, so as to provide scientific basis for the radiation protection management and prevent the occurrence of radioactive occupational diseases.Methods The radiation workers were monitored quarterly according to the external exposure individual dose monitoring standard, which their occupational categories included Diagnostic Radiology (2A) , Interventional Radiology (2E) , Nuclear Medicine (2C) , Dental Radiology (2B), Radiotherapy (2D) , Industrial Irradiation (3A), Industrial Inspection(3B) and so on. The monitoring data were aggregated using the personal monitoring management system of the National Radiological Health Information Platform.Results A total of 6,465 radiological workers were monitored for the four years, with an annual effective dose of 0.28 mSv/a per capita. 654 (10.12%) workers’ annual effective dose was lower than MDL, and the MDL～1 group was 5619 (86.91%). The four-year collective effective dose was 1.83 Sv, of which the collective effective dose of MDL～1 group was 1.46 Sv. The per capita effective dose of nuclear medicine was 0.56 mSv/a, higher than other occupational monitoring results. Interventional radiology was 0.44 mSv/a, radiotherapy was the lowest (0.21 mSv/a). The per capita effective dose of diagnostic radiology was 0.27mSv/a, which contributed the most to the collective effective dose.Conclusion According to GB 18871—2002《Basic standards for ionizing radiation protection and radiation source safety》, the radiation workers monitored were all far below the dose limit of 20mSv, and the working environment of the radiation workers was in a safe and stable state with good radiation protection conditions.