2015-2019年某医院放射人员个人剂量监测结果分析

Surveillance results and analysis of radiation individual doses in a hospital from 2015 to 2019

目的了解河北省某医院2015—2019年放射工作人员职业外照射剂量水平及动态变化情况,从而评价放射性工作防护情况及放射管理措施的效果,为加强放射人员的管理提供依据。方法依据现行GBZ 128标准,采集2015—2019年所有放射工作人员连续五年外照射个人剂量监测数据,比较不同年份及不同职业类别(放射岗位)间人均年有效剂量的动态变化和差异水平。结果2015—2019年人均年有效剂量分别为0.16 mSv/a、0.08 mSv/a、1.25 mSv/a、0.72 mSv/a和0.37 mSv/a,均小于5 mSv/a,低于医院的管理目标值和国家标准的要求;不同年份间比较2017年人均年有效剂量最高,且差异有统计学意义;不同岗位间比较介入放射(2E)和核医学(2C)人均年有效剂量较高,且差异有统计学意义。结论该院放射工作人员人均年有效剂量处于较低水平,应继续保持现有的放射防护管理和措施;介入放射与核医学放射人员个人剂量较高,是放射防护管理的重点监护对象。

Objective To understand the level and dynamic changes of occupational external exposure dose of radiation employees in a hospital in Hebei Province from 2015 to 2019,so as to evaluate the radiation protection and the effect of radiation management measures,and provide scientific references for strengthening the management of radiation employees.Methods According to the current standard of GBZ128,the external exposure dose of all radiation employees for five consecutive years from 2015 to 2019 were collected to compare the changes and different levels of effective dose per capita in different years and different occupational categories(radiation posts).Results The average annual individual effective doses from 2015 to 2019 were 0.16 mSv/a,0.08 mSv/a,1.25 mSv/a,0.72 mSv/a,0.37 mSv/a,respectively,which were all less than 5 mSv/a and lower than the management target value of hospitals and the requirements of national standards;Comparing these 5 years,the average annual individual effective dose in 2017 was the highest,and the difference was statistically significant.The average annual individual effective doses of interventional radiology group(2 E)and nuclear medicine group(2 C)were higher than other groups,and the difference was statistically significant.Conclusion The average annual individual effective doses of the radiological staff in this hospital were at a low level,and the existing radiation protection management and measures should continue to be maintained.The individual dose in interventional radiology group and nuclear medicine group were relatively higher than other groups and they are the key supervising objects of radiation protection management.