某TOMO机房的防护设计与监测评价

Protection Design and Monitoring Evaluation of a TOMO Equipment Room

目的:对某一典型的TOMO设备机房进行屏蔽效果估算和监测评价分析。方法:依据电子直线加速器治疗室设计方案,采用GBZ/T 201.2-2011附录D推荐的方法估算某TOMO机房屏蔽墙和防护门处剂量率,同时对该运行后的TOMO机房的场所辐射环境进行监测。结果:从理论估算结果可知,该TOMO机房各侧墙体、防护门、顶棚上方的剂量率估算值均小于2.5 μSv/h;从实际监测结果可知,TOMO机房外围的辐射剂量率为环境本底水平。结论:该TOMO机房的屏蔽效果能够满足标准规定的剂量率限值要求。

Objective:To perform shielding effect estimation and monitoring evaluation analysis for a typical TOMO equipment room.Methods:According to the design scheme of electron linear accelerator treatment room,the method recommended in GBZ/T 201.2-2011 appendix D is used to estimate the dose rate at the shielding wall and protective door of a TOMO equipment room,and the radiation environment of the TOMO equipment room after operation is monitored.Results:From the theoretical estimation results,it can be seen that the estimated dose rates on each side walls,protective doors,and ceiling of the TOMO equipment room are less than 2.5 μSv/h.From the actual monitoring results,it can be seen that the radiation dose rate around the tomo machine room is the environmental background level.Conclusion:The shielding effect of the TOMO equipment room can meet the requirements of dose rate limit specified by the standard.