检测模体对医用电子直线加速器治疗室防护效果的影响分析研究  

Study and Analysis of the Influence of Measuring Phantom on Protective Effect of Medical Accelerator Rooms

作　　者：汤晓浩 任福利 潘世香[4] 曹磊[5] 邓君[5] 

机构地区：[1]中国原子能科学研究院 [2]<原子能科学技术>编辑部,北京102413 [3]内蒙古自治区卫生厅卫生监督所 [4]青岛大学附属医院 [5]中国疾病控制中心辐射防护与核安全医学所

出　　处：《中国辐射卫生》2014年第1期69-71,共3页Chinese Journal of Radiological Health

摘　　要：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 The protective effect of medical accelerator room was analyzed, and shielding data were accumulated so as to provide the control of occupational exposure with scientific reference through in - site measurement and calculation with the existence of measuring phantom. Methods Radiation levels at concerned points were measured by X - ray dose rate meter with and without phantom, and accordance degree between the data measured and the one calculated based on NCRP 151 re- port was analyzed. Results The result shows that the X - ray dose level at the entrance of room and in the maze was increased with the use of phantom. Meanwhile, it shows strong link between scattered X - ray and radiation protection design of the maze and the orientation of X - rays. Conclusion Attention should be paid to the influence of measuring phantom on protective effect of treating room, and proper assessing model and method should be chosen to carry out the radioactive occupational haz- ard assessment for medical accelerator room.

关 键 词：医用加速器 检测模体 防护效果 

分 类 号：R144.1[医药卫生—公共卫生与预防医学]