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目的了解邵阳市医疗机构X射线影像工作人员职业性外照射个人剂量水平。方法采用RGD-3型热释光剂量仪,对93家医疗机构的X射线影像工作人员进行职业性外照射个人剂量监测,利用Microsoft office Excel 2003软件对监测数据进行统计分析。结果2004—2007年共对邵阳市医疗机构X射线影像工作人员外照射个人剂量监测763人次,个人年有效剂量<5mSv为742人次(97.2%);人均年有效剂量为0.86mSv,显著低于国家标准限值(50mSv)(u=592.76,P<0.01),亦低于全国放射工作人员人均年有效剂量1.29mSv(u=5.18,P<0.01),接近湖南省放射工作人员人均年有效剂量1.000mSv(u=1.69,P>0.05);其中三级、二级和二级以下医疗机构放射工作人员个人年有效剂量分别为0.46、0.73和1.12mSv(F0.05(2.760)=3.44,P<0.05)。结论邵阳市医疗机构X射线影像工作人员个人有效剂量整体水平较低,应重点加强基层医疗机构放射防护工作的监督管理。
Objective To understand the personal exposure dose of X-ray imaging staff in medical institutions in Shaoyang City. Methods RGD-3 thermoluminescence dosimeter was used to monitor the occupational exposure to X-ray in 93 medical institutions and the statistical analysis of the monitoring data was conducted by Microsoft Office Excel 2003 software. Results A total of 763 person-times of external dose of X-ray imaging staff were monitored in Shaoyang City from 2004 to 2007. The annual effective dose was <5mSv, which was 742 persons (97.2%). The annual average effective dose was 0.86mSv, which was significantly lower than that of the national (U = 5.18, P <0.01). The average annual effective dose per capita of Hunan radiation workers was 1.000mV (u = 5.18, P <0.01) mSv (u = 1.69, P> 0.05). The annual effective doses of radiation workers in tertiary, secondary and secondary medical institutions were 0.46, 0.73 and 1.12 mSv respectively (F0.05 (2.760) = 3.44, P < 0.05). Conclusion The individual effective dose of X-ray imaging staff in medical institutions in Shaoyang City is low overall, and the supervision and management of radiological protection in primary medical institutions should be emphasized.