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目的根据辐射防护基本原则及相关法规标准,对某医院10MV医用电子加速器机房屏蔽设计进行核实和计算,并验证放射防护效果,以实现放射防护最优化。方法采用GBZ/T 201.2-2011中的计算方法对某医院放疗中心10MV加速器机房屏蔽设计进行核实与计算,利用防护检测设备对其工作场所辐射水平进行防护效果验证检测,并对比分析计算结果与验证检测结果。结果主屏蔽墙和室顶主屏蔽计算结果(分别为1.52μSv/h、2.93μSv/h)与防护效果验证检测结果(最大分别为1.25μSv/h、2.8μSv/h)接近,其余副屏蔽墙(顶)计算结果(最大为1.19μSv/h)大于防护效果验证检测结果(最大0.23μSv/h);防护门外计算结果(0.33μSv/h)略小于检测结果(最大为0.60μSv/h)。结论医用电子加速器屏蔽计算结果与防护效果验证检测结果基本相符,建设单位应按照国家有关标准设计,保证施工质量,并加强放射防护效果验证,确保放射工作人员和相关公众的健康与安全。
Objective To verify and calculate the shielding design of 10MV medical electron accelerator room in a hospital according to the basic principles of radiation protection and relevant laws and regulations, and verify the radiological protection effect so as to optimize the radiation protection. Methods The calculation method in GBZ / T 201.2-2011 was used to verify and calculate the shield design of a 10MV accelerator room in a radiotherapy center of a hospital. The protective and testing equipment was used to verify and test the protective effect of the radiation level at the workplace. The results were compared with the results of verification Test results. Results The calculated results of the main shield and the main shield on the roof (1.52μSv / h and 2.93μSv / h, respectively) are close to those of the protective effect verification test (maximum 1.25μSv / h and 2.8μSv / h, respectively) (Maximum of 1.19μSv / h) is greater than the test result of protective effect verification (maximum 0.23μSv / h); the result of protective outside door (0.33μSv / h) is slightly less than the test result (maximum is 0.60μSv / h). Conclusion The calculated results of medical electron accelerator shield are in good agreement with the results of the protective effect verification test. The construction unit should design in accordance with relevant national standards to ensure the quality of construction and strengthen the verification of the radiological protection effect to ensure the health and safety of radiation workers and relevant public.