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为评估机房辐射防护水平,依据机器的运行上限参数,运用相关文献报道的计算方法,对X射线初级和次级屏蔽层以及加速器防护门的屏蔽能力进行估算和分析。结果表明:加速器机房四周墙体(除迷路内墙外)和天棚的设计厚度均大于理论计算厚度,表明机房的相应屏蔽层厚度设计可以满足15 MeV X射线加速器的防护标准及选定的剂量管理目标值;此外,机房防护门需增加8.3 mm铅和6.9 cm含硼聚乙烯才能分别满足对X射线和中子的屏蔽要求。
In order to assess the radiation protection level of the engine room, the shielding ability of the primary and secondary shielding layers of X-ray and the protective barrier of the accelerator is estimated and analyzed according to the upper limit of the operation parameters of the machine and the calculation method reported in the relevant literature. The results show that the design thicknesses of the walls (excluding the lost inner wall) and the ceiling of the accelerator room are greater than the theoretical thickness, indicating that the corresponding shielding layer thickness of the engine room can meet the protection standard of 15 MeV X-ray accelerator and the selected dose management In addition, 8.3 mm lead and 6.9 cm boron-containing polyethylene should be added to the room door to meet the shielding requirements for X-rays and neutrons, respectively.