Status of radiation protection and safety and management countermeasures for the application of radioactive sources of class III and above in Yunnan Province

Objective: To improve the management of dangerous radioactive sources and ensure their radiation safety. Methods: The safety status of radioactive sources of Class III and above, the data of environmental radiation and individuals dose, and the problems and management experiences found by on-site supervision and inspection were summarized and analyzed. Results: In 2018, there were 336 radioactive sources of Class III and above in Yunnan Province, and they were mainly used in the fields of industrial irradiation and radiation therapy. The radiation facilities were basically intact, and the gamma radiation levels around the source sites were between 0.045 ∼ 0.204 μGy · h^-1. The individual dose met the limit requirement of occupational personnel. However, there still existed some deficiencies in the maintenance of security device, the operation of radioactive sources and emergency preparedness. Conclusion: It is necessary to strictly supervise the issuance of licenses, strengthen internal radiation safety management and evaluation, and focus on emergency training and nuclear safety culture construction. (authors)