Objective: To analyze the individual dose level of occupational external radiation of radiation workers in Lanzhou in 2019, so as to provide reference for radiation protection and occupational health management. Methods: In April 2020, a total of 1460 radiation workers in Gansu Provincial Center for Disease Control and Prevention in 2019 were selected as the research objects. The unit nature, hospital level and occupational category of the monitored workers were collected, and the monitoring results of external radiation personal dose in 2019 were analyzed and compared. Results: In the occupational external radiation monitoring of radiation workers in Lanzhou in 2019, the effective dose of 48 persons was 1.0~<5.0 mSv, the effective dose of 2 persons was 5.0~<10.0 mSv, the annual collective effective dose was 308.21 people·mSv, and the average annual effective dose of monitored persons was 0.21 mSv/a. There was significant difference in the distribution of annual effective dose per capita among different occupational groups (H=34.43, P<0.05) . The annual effective dose per capita of nuclear medicine personnel was higher (0.56 mSv/a) , followed by interventional radiology (0.33 mSv/a) . The ratio of annual collective dose to total annual collective dose with annual individual dose more than 5 mSv (SR(5)) and the ratio of the number of staff with annual individual dose more than 1mSv to the total number of monitored personnel (NR(1)) were higher in nuclear medicine and interventional radiology personnel. The average annual effective dose distribution of diagnostic radiologists in different level hospitals was statistically significant (H=16.46, P<0.05) . The average annual effective dose in private hospitals, community hospitals and health centers was higher (0.32 mSv) , followed by county hospitals (0.23 mSv) . Conclusion: The individual dose of occupational external radiation of radiation workers in Lanzhou is generally low, and the annual effective dose of nuclear medicine and interventional radiology workers is high. The management of radiation protection should be emphasis on this people. And it is suggested to strengthen the supervision of private hospitals and update and maintain the equipment of community health centers.
目的： 分析兰州市放射工作人员2019年职业性外照射个人剂量水平，为放射防护和职业健康管理工作提供参考。 方法： 于2020年4月，选取2019年在甘肃省疾病预防控制中心进行职业性外照射个人剂量监测的1 460名放射工作人员为研究对象，收集被监测人员的单位性质、医院级别和职业类别以及2019年的外照射个人剂量监测结果，分析比较不同职业类别和医院级别放射工作人员的外照射个人剂量水平。 结果： 兰州市放射工作人员2019年职业性外照射监测中48人的有效剂量为1.0~<5.0 mSv，2人的有效剂量为5.0~<10.0 mSv；年集体有效剂量为308.21人·mSv，受监测人员的人均年有效剂量为0.21 mSv/a。不同职业类别工作人员人均年有效剂量分布差异有统计学意义（H=34.43，P<0.05），核医学人员的人均年有效剂量较高（0.56 mSv/a），其次为介入放射学（0.33 mSv/a）。年个人剂量超过5 mSv的年集体剂量与年总集体剂量的比值（SR(5)）和年个人剂量超过1 mSv的工作人员数与受监测人员总数的比值（NR(1)）较高的均为核医学和介入放射学人员。不同级别医院诊断放射人员人均年有效剂量分布差异有统计学意义（H=16.46，P<0.05），民营、社区、卫生院的人均年有效剂量较高（0.32 mSv），其次是县级医院（0.23 mSv）。 结论： 兰州市放射工作人员职业性外照射个人剂量整体处于较低水平，核医学和介入放射学人员年有效剂量偏高，应重点加强其放射防护管理；同时建议加强对民营医院的监管以及社区卫生院的设备更新、维护。.
Keywords: Effective dose; Individual monitoring of external exposure; Radiation; Workers.