2014~2018年天津市部分医疗机构放射工作人员职业性外照射个人剂量监测结果分析

Analysis of personal dose monitoring results of occupational external exposure for radiation workers in some medical institutions in Tianjin from 2014 to 2018

目的分析天津市部分医疗机构放射工作人员的外照射个人剂量情况,为放射防护工作提供参考。方法采用整群抽样方法,选取2014至2018年天津市部分医疗机构(包含三级、二级、一级医院)的所有放射工作人员为调查对象,包括X射线影像诊断技师、放射治疗技师、核医学技师和介入放射学技师,共8718人,收集整理职业性外照射个人剂量数据,分析和评价其职业性外照射接触水平。结果2014~2018年共监测8718人次,年有效剂量高于5 mSv的有14人(占0.2%),低于2 mSv的有8661人次(占99.3%);2~5.00 mSv有43人(占0.5%);人均年有效剂量最高的是X射线影像诊断技师(0.22 mSv);一级和二级医院放射工作人员人均年有效剂量高于三级医院;个人剂量监测异常达73人次,占监测人数的0.8%;2014~2018年4类监测的放射工种工作人员年均有效剂量变化均呈下降趋势,调查中2014年4种放射工作人员年均有效剂量最高。结论天津市部分医疗机构放射工作人员个人剂量均处于较低水平,应重点关注诊断技师接触水平。

Objective To analyze the personal dose of radiation exposure of radiation workers in some medical institutions in Tianjin,and to provide reference for radiation protection work.Methods Using cluster sampling method,8718 radiation workers from some medical institutions(including tertiary,secondary and first-level hospitals)in Tianjin from 2014 to 2018 were selected as the subjects of investigation.Monitoring data were collected,analyzed and evaluated.Results From 2014 to 2018,a total of 8718 persons were monitored,with 14 persons(0.2%)whose annual effective dose was higher than 5 mSv;8661 persons(99.3%)whose annual effective dose was lower than 2 mSv;43 persons(0.5%)whose annual effective dose per capita was the highest in diagnostic radiology,which was 0.22 mSv;the annual effective dose per capita of radiation workers in primary and secondary hospitals was higher than that in tertiary hospitals;and the abnormal rate of individual dose monitoring was 73.Personnel,accounting for 0.8%of the total number of monitored personnel;the annual effective dose changes of the four types of radiation workers monitored from 2014 to 2018 showed a downward trend,and the annual effective dose of the four types of radiation workers in 2014 was the highest.Conclusion Personal dosage of radiation workers in some medical institutions in Tianjin is at a low level,and attention should be paid to diagnostic radiology workers.