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目的探讨基于“辐射防护最优化”原则的医用电子直线加速器(以下简称加速器)机房防护改造设计方案,并验证屏蔽效果。方法收集该机房的基础资料,按照国家标准及医院剂量率控制水平要求,通过理论计算结合项目现场情况给出合理改造方案并现场检测验证其防护效果。结果按照改造方案施工后,经现场放射防护检测评价,改建后的机房放射防护效果达到国家标准及医院剂量率控制水平要求。结论在加速器机房设计阶段进行职业病危害放射防护预评价是非常必要的,设备参数改变或施工变更时,应重新进行评价;机房改造方案在考虑经济成本前提下还应充分考虑周围环境、建筑承重、施工难度、空间限制及方便使用等多方面因素。
Objective To discuss the design of the protection of medical linear accelerator (hereinafter referred to as accelerator) based on the principle of “Radiation Protection Optimization” and to verify the shielding effect. Methods The basic information of the engine room was collected. According to the requirements of national standards and the dose rate control of the hospital, a reasonable rebuilding plan was given based on the theoretical calculation combined with the on-site situation of the project, and the protective effect was verified by on-site testing. Results After construction according to the rebuilding program, the radiological protection effect of the reconstructed engine room reached the national standard and the dosage rate control requirement of the hospital after the radiation protection test and evaluation on site. Conclusion Pre-evaluation of occupational hazards radiological protection in the design phase of accelerator room is very necessary. When the equipment parameters are changed or the construction is changed, the evaluation should be re-evaluated. Under the premise of considering the economic cost, the reconstruction plan of the engine room should fully consider the surrounding environment, Construction difficulty, space constraints and ease of use and many other factors.