^(125)I粒籽植入治疗辐射防护及关键控制技术探讨

Discussion on radiation protection and critical control techniques on ^(125)I seed implantation

目的探讨碘-125(^(125)I)放射性粒籽植入治疗过程中可能存在的放射性职业病危害因素及辐射水平,探讨关键控制技术。方法以5家开展^(125)I粒籽植入治疗项目的医疗机构为研究对象,采用放射卫生学现场调查、工作场所辐射防护水平检测、人员个人剂量监测等方法,调查粒籽植入涉源工作场所及相关人员的辐射水平;结合源项分析及放射卫生管理经验,根据危害分析与关键控制点(HACCP)的原理,探讨^(125)I粒籽植入治疗过程的关键控制点。结果不同涉源场所中粒籽植入源运输包装、粒籽植入治疗室和专用病房工作场所各关注点的周围剂量当量率为本底~1.80μSv/h(病房门处),均小于2.5μSv/h;35名放射工作人员全年个人剂量监测结果为0.20~1.80 m Sv,平均为0.42m Sv。结论不同涉源场所的辐射水平及人员的受照剂量均符合国家标准限值的要求;应根据关键控制措施,对^(125)I放射性粒籽植入治疗过程的关键环节予以控制。

Objective To explore the occupational risk factors and radiation levels in the process of iodine - 125 （ 125 I） seed implantation, and discuss the key control techniques. Methods Taking the 5 tertiary level general hospitals performing 125I seeds implantation project as the research object, the field hygienic survey, environmental radiation monitoring and personal dose monitoring were carried out. Combined with the characteristics of source items and radiological hygiene management expe- rience, and according to the principle of hazard analysis and critical control point （HACCP）, the key control points of 12sI seed implantation process were discussed. Results The ambient dose equivalent rates of 12s I seeds package, implantation ther- apeutic room and special wards ranged from the background level to 1.80 μSv/h, they were all less than 2.5 μSv/h. The an- nual effective dose of 35 staff ranged from 0.20 tol. 80 mSv/a, with an average of 0.42 mSv/a. Conclusion Both the radia- tion level of the workplace and exposure dose of staff were in accord with the national standard limits. According to the critical control points, the key control measures should be implemented in the practice of 125I seed implantation.