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目的通过现场测量和防护估算,对采用医用加速器性能检测模体时,医用加速器治疗室防护效果进行分析,为职业照射的控制提供科学依据,积累放射防护屏蔽实验数据。方法分别在加装与未加装检测模体条件下,采用X-γ剂量率仪测量加速器机房内关注点的辐射水平,并利用NCRP 151号出版物提出的方法对剂量水平进行符合估算,分析6MV医用加速器治疗室的防护效果。结果结果表明,医用加速器性能检测模体的采用,增加了治疗室出入口和迷路内的杂散X射线剂量水平。同时,治疗室出入口处杂散X射线剂量水平与加速器机房迷路的辐射防护设计、射线投照方向密切相关。结论进行医用加速器治疗室的职业危害放射防护评价时,应关注模体对治疗室防护效果的影响,选择适宜的评价方式和方法。
OBJECTIVE: To analyze the protective effect of medical accelerator treatment room by using medical accelerator performance test phantom and to provide scientific evidence for occupational exposure control and to accumulate the experimental data of radiation shielding masking through on-site measurement and protection estimation. Methods The X-γ dose rate meter was used to measure the radiation level in the accelerator room with and without test modules, and the dose level was estimated and analyzed by the method of NCRP No. 151 6MV medical accelerator treatment room protective effect. The results show that the use of medical accelerator performance test phantoms increases the stray X-ray dose levels in the entrance and exit of the treatment room. At the same time, stray X-ray dose levels at the entrance to the treatment room are closely related to the radiation protection design and the radiation direction of the accelerator room. Conclusion In the evaluation of occupational hazards radiation protection in medical accelerator room, attention should be paid to the influence of phantom on the protective effect of the treatment room, and the appropriate evaluation methods and methods should be selected.