放射诊疗工作人员个人剂量监测异常结果分析

Analyzing the abnormal results of personal dose monitoring of medical radiation workers

目的分析放射诊疗工作人员个人剂量监测结果异常情况与原因。方法采用方便抽样方法,选择广东省职业病防治院个人剂量监测室2016-2019年监测的放射诊疗工作人员为研究对象,对其单周期个人剂量当量≥1.25 mSv(调查水平)的异常结果与原因进行分析。结果研究对象个人剂量监测异常结果检出率为0.26%(263/102284);其中,非真实结果检出率为0.19%(194/102284),真实结果检出率为0.07%(69/102284)。异常结果中,个人剂量<5.00 mSv者占73.38%(193/263)。不同职业类别人群中,介入放射学人群个人剂量监测异常结果和非真实结果的检出率均最高(P值均<0.01)。珠江三角洲地区人群个人剂量监测异常结果和非真实结果检出率均高于非珠江三角洲地区(0.27%vs 0.17%,0.20%vs 0.12%,P值均<0.05);三级医院人群个人剂量监测非真实结果检出率低于非三级医院(0.18%vs 0.30%,P<0.05)。个人剂量监测真实结果的主要原因是工作量增加(占43.48%),非真实结果的主要原因是剂量计留置于工作场所(占57.73%)。结论放射诊疗工作人员个人剂量监测异常检出率较高;应以介入放射学、珠三角地区医院和非三级医院的放射工作人员为重点,加强放射防护工作。

Objective To analyze the abnormal results and their causes of personal dose monitoring on medical radiation workers.Methods The medical radiation workers monitored from 2016 to 2019 in the personal dose monitoring room of Guangdong Province Hospital for Occupational Disease Prevention and Treatment were selected as the study subjects using convenient sampling method. The abnormal results and their causes of the medical radiation workers with personal dose equivalent ≥1.25 mSv(investigation level) in a single period were analyzed. Results The rate of abnormal results of personal dose monitoring was 0.26%(263/102 284). The false result rate was 0.19%(194/102 284), and that of the true result rate was 0.07%(69/102 284). A total of 73.38%(193/263) of medical radiation workers had abnormal results with an personal dose equivalent less than 5.00 mSv. Among different occupational groups, the abnormal results and false results in personal dose monitoring in interventional radiology group were the highest(all P<0.01). The abnormal result rate and false result rate were higher in the Pearl River Delta area than that in the non-Pearl River Delta area(0.27% vs 0.17%, 0.20% vs 0.12%, all P<0.05). The rate of false result of personal dose monitoring in the tertiary hospitals was lower than that in the non-tertiary hospitals(0.18% vs 0.30%, P<0.05). The main reason for the true results of personal dose monitoring was the increase of workload(43.48%), and the main reason for the false results was that the dosimeter was left in the workplace(57.73%). Conclusion The rate of abnormal results of personal dose monitoring in the medical radiation workers is high. Radiological protection should be strengthened with emphasis on medical radiation workers in interventional radiology, Pearl River Delta area hospitals and non-tertiary hospitals.