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目的对医院现有预留旧加速器机房进行放射防护屏蔽改造以满足新购买的加速器的技术指标对机房的要求,以达到标准《放射治疗机房的辐射屏蔽规范第1部分:一般原则》(GBZ/T 201.1-2007)、《放射治疗机房的辐射屏蔽规范第2部分:电子直线加速器放射治疗机房》(GBZ/T201.2-2011)、《建设项目职业病危害放射防护评价规范第2部分:放射治疗装置》(GBZ/T 220.2-2009)的防护要求。方法依据国家标准《放射治疗机房的辐射屏蔽规范第2部分:电子直线加速器放射治疗机房》(GBZ/T201.2-2011),用新购置的加速器技术指标在现有旧机房的机房面积及高度尺寸,计算出有用束主屏蔽墙、与主屏蔽区直接相连的次屏蔽区、侧屏蔽墙、迷路外墙、迷路内墙、有用束主屏蔽顶、与顶主屏蔽区直接相连的次屏蔽顶的厚度,以及主屏蔽区的半宽度、机房大门的铅当量,再把计算出的数据与现有旧机房进行比较,不足的地方补足完善,由于迷路短,除机房大门及迷路内墙与其它加速器不一样,其余墙壁与正常迷路的都一样,这里就只讨论机房大门及迷路内墙。结果验收检测数据显示设计方案正确。结论短迷路加速器的设计重点在机房大门上,机房大门的设计又以迷路内墙、及迷道内口宽度相关联,该医院迷道内口宽度适当,只需考虑迷路内墙。迷路内墙需要提高剂量率参考控制水平值,以减少机房大门的压力,再提高机房大门的提高剂量率参考控制水平值,把这两点因素考虑进去设计出的防护方案就能满足防护标准的要求。
OBJECTIVE To improve the shielding room of the existing old accelerator room in the hospital to meet the requirements of the engine room of the newly purchased accelerator to meet the standard “Radiation Shielding Standard for Radiotherapy Equipment Room Part 1: General Principles” (GBZ / T 201.1-2007), “Radiation Shielding Room Part 2: Electron Linear Accelerator Radiation Therapy Room” (GBZ / T201.2-2011), “Code of Practice for Evaluation of Radiation Protection of Occupational Hazards in Construction Projects Part 2: Radiation Therapy Device ”(GBZ / T 220.2-2009) protection requirements. Methods According to the national standard “Radiation Shielding Room Part 2: Electron Linear Accelerator Radiation Therapy Room” (GBZ / T201.2-2011), with newly purchased accelerator technical indicators in the existing engine room room area and height Size, calculated useful beam main shield wall, the main shield area is directly connected to the secondary shield area, side shield wall, lost exterior wall, lost interior wall, useful beam main shield top, directly connected with the main shield area sub shield The thickness of the main shield area and half the width of the engine room door lead equivalent, and then calculate the data with the existing old engine room for comparison, inadequate complement to improve, due to lost a short, except the engine room door and get lost inside the wall and other Accelerator is not the same, the remaining walls are the same as the normal lost, here only to discuss the engine room and get lost inside the wall. The results of acceptance testing data show that the design is correct. Conclusions The design of short launcher is focused on the engine room door. The design of the engine room door is related to the lost inner wall and the width of the labyrinth inner mouth. The width of the labyrinth of the hospital labyrinth is appropriate, and only the lost inner wall needs to be considered. Lost the inner wall need to increase the dose rate reference control level to reduce the pressure on the engine room door, and then increase the engine room door to increase the dose rate reference control level, taking these two factors into the design of the protection program to meet the protection standards Claim.