| Wang Hongfang,Feng Zechen,Wang Huan,et al.Investigation on present state of radiation protection of a 60Co irradiation facility[J].Chinese Journal of Radiological Medicine and Protection,2023,43(3):204-208 |
| Investigation on present state of radiation protection of a 60Co irradiation facility |
| Received:September 20, 2022 |
| DOI：10.3760/cma.j.cn112271-20220920-00379 |
| KeyWords:Irradiation facility Dose equivalent Radiation protection |
| FundProject:北京市高层次公共卫生技术人才建设项目（学科带头人-01-20） |
| Author Name | Affiliation | E-mail | | Wang Hongfang | Beijing Center for Disease Prevention and Control, Beijing 100013, China | | | Feng Zechen | Beijing Center for Disease Prevention and Control, Beijing 100013, China | | | Wang Huan | Beijing Center for Disease Prevention and Control, Beijing 100013, China | | | Bai Bin | Beijing Center for Disease Prevention and Control, Beijing 100013, China | | | Zhai Shuguang | Beijing Center for Disease Prevention and Control, Beijing 100013, China | | | Ma Yongzhong | Beijing Center for Disease Prevention and Control, Beijing 100013, China | myz0905@126.com |
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| Abstract:: |
| Objective To explore the present state of radiation protection in an operational large-sized irradiation facility and the distribution of incurred radiation doses in the controlled area under abnormal conditions, and to analyze the acompanied radiation risk.Methods With an irradiation facility in operation as the research object, the radiation doses were measured using AT1121 X and gamma dose rate meters for the soruce both in working and storage. Thermoluminescent dosimeters (TLDs) were used to measure the dose distribution in an irradiation field under abnormal conditions. The radiation safety features were checked against the several relevant national standards, with the radiation risks evaluated.Results The radiation dose rates were in the range of 0.09-0.11 μSv/h, lower than the environmental background level whether in storage or working. Under abnormal working conditions, the radiation dose values from high to low were 1.0-101.3 Sv, 32.7-514.0 mSv and 8.7-183.2 μSv in the irradiation field, respectively. At the outside maze, the doses were close to the background level.Conclusions The protection features of the irradiation facility meet the requirements of the relevant national standards. Under abnormal conditions, radiation could cause serious damages to the persons staying in the irradiation field. These persons were suggested to access to maze as soon as possible to reduce the exposure time, and activate the emergency protection equipments to deescalate the 60Co source onto the well. |
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