某医院直线加速器机房防护门改造实例分析  

Example Analysis of the Linear Accelerator Protective Door Reconstruction of A Hospital

作　　者：朱卫国[1] 刘梅[1] 侯长松[1] 梁婧[1] 张庆召[1] 

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088

出　　处：《中国辐射卫生》2015年第2期131-133,共3页Chinese Journal of Radiological Health

摘　　要：目的改造直线加速器机房防护门,降低防护门外的中子辐射剂量水平,减少对人员的危害。方法根据理论计算的结果,在原防护门防护材料的基础上增加聚乙烯防护材料,以减少门外的中子辐射。结果增加聚乙烯材料之前防护门外30 cm处的中子辐射剂量水平为2.54-3.83μSv/h,防护门改造之后防护门外30 cm处的中子辐射剂量水平低于仪器探测下限。结论对电子标称能量大于10 MeV的医用电子直线加速器进行防护门的设计时需要考虑中子的危害,富含低原子序数的材料适用于对中子的屏蔽。Objective To reconstruct the door of linear accelerator room for reducing the outside dose level of neutron shield door to reduce the harm to people.Methods According to the theoretical calculation results,to increase polyethylene based on the original door protection materials to reduce the neutron radiation outside.Results Prior to addition of polyethylene materials,neutron radiation dose level outside the door at 30 cm were 2.54 - 3.83 μSv / h.After the reconstruction of the shield door,neutron radiation dose level outside were below the instrument detection limit.Conclusion When the electron nominal energy greater than 10 Me V,design of door of medical electron linear accelerator must consider the reduce of thought about the harm of neutron,materials with low atomic number were suitable for the neutron shielding.

关 键 词：中子防护 防护门 迷路设计 医用电子直线加速器 

分 类 号：R142[医药卫生—公共卫生与预防医学]