关键词: 9 MeV, 工业探伤, 电子加速器, 辐射防护, 辐射安全, 评价

Abstract: Objective To master the radiation protection effect of the flaw detection room of a newly-built 9 MeV electron accelerator. Methods The theoretical calculation method of radiation shielding recommended in the NCRP-51 and NCRP-151 reports of the National Council on Radiation Protection and Measurements（NCRP） was used to calculate the theoretical thickness of the shielding wall and the dose rate at the point of concern in the flaw detection room and compared with the actual test results in 2021. Results During the operation of 9 MeV electron linear accelerator flaw detection room,according to the design value of concrete shielding wall,the dose rate at the accessible position 30 cm outside the wall is calculated to be 0.03-0.64 μSv/h,the dose rate at 30 cm outside the roof is 10 μSv/h. Conclusion Combined with the shielding calculation results and the actual field monitoring and measurement results,it shows that the radiation shielding design,radiation safety protection devices and radiation protection management measures of the newly-built 9 MeV industrial flaw detection electron accelerator flaw detection room conform to the radiation protection standards of industrial flaw detection room in China.

Key words: 9 MeV, Industrial flaw detection, Electron accelerator, Radiation protection, Radiation safety, Evaluation