Analysis of abnormal results of personal dose monitoring for some radiation workers in Nanjing from 2015 to 2017

Objective: To analyze the abnormal data in personal dose monitoring of radiation workers in Nanjing Municipal Center for Disease Control and Prevention from 2015 to 2017. Methods: Thermoluminescence measuring method was used to detect personal dosimeters. When the single monitoring result exceeds 1.25 mSv, the 'Dose verification registration form for individual monitoring of occupational external exposure' was issued. The abnormal dose and its causes were aggregated and analyzed by excel. Results: One hundred and sixty-six cases of abnormal doses of individuals were recorded from 2015 to 2017 in Nanjing, most of which were below 5 mSv. The main reasons for the abnormal dose included that the dosimeter left in the radiation workplace, wearing the expired dosimeter, and wearing a dosimeter to receive radiation examination, accounting for 75.90% of the total abnormal dose. Conclusion: Strengthening the training of radiation protection knowledge and instructing radiation workers to correctly wear and using the personal dosimeters is the priority areas of our work. (authors)