| Lin Bao,Sun Guixiang,Zhang Chaoyu,et al.Evaluation of internal doses to workers and monitoring of 131I concentration in air in nuclear medicine workplaces[J].Chinese Journal of Radiological Medicine and Protection,2023,43(9):717-723 |
| Evaluation of internal doses to workers and monitoring of 131I concentration in air in nuclear medicine workplaces |
| Received:April 25, 2023 |
| DOI：10.3760/cma.j.cn112271-20230425-00129 |
| KeyWords:131I Air sampling Activity concentration Internal exposure |
| FundProject:河南省医学科技攻关计划项目（LHGJ20190815） |
| Author Name | Affiliation | E-mail | | Lin Bao | Henan Province Health Hygiene Technical Supervision Center, Zhengzhou 450046, China | | | Sun Guixiang | Zhengzhou Health Supervision Bureau, Zhengzhou 450053, China | | | Zhang Chaoyu | Henan Jiadehengli Technology Co., Ltd, Zhengzhou 450001, China | | | Zhai Hezheng | Institute of Radiation Medicine, Chinese Academy of Medical Sciences, Tianjin 300192, China | | | Guo Yong | Zhengzhou Health Supervision Bureau, Zhengzhou 450053, China | | | Zhang Shuyi | Henan Province Health Hygiene Technical Supervision Center, Zhengzhou 450046, China | | | Liu Shaolong | Henan Jiadehengli Technology Co., Ltd, Zhengzhou 450001, China | | | Guo Zixuan | Henan Jiadehengli Technology Co., Ltd, Zhengzhou 450001, China | | | Cheng Xiaojun | Third People's Hospital of Henan Province(Henan Hospital of Occupational Disease), Henan Key Laboratory of Medicine on Radiobiology and Epidemiology, Zhengzhou 450052, China | hnfsws@163.com |
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| Abstract:: |
| Objective To asscentain the 131I activity concentration in 131I treatment workplaces and to explore the method of estimating the internal dose to workers by air sampling and to analyze its influencing factors.Methods Air sampling method was used to collect aerosols containing radioactivity in 10 randomly selected workplaces in Zhengzhou where 131I therapy was performed. Aactivity concentration of 131I in treatment workplace was measured for gamma emitters by gamma-ray spectrometry. The internal dose due to 131I inhalation was estimated based on measurement result and field investigation result. Results The activity concentration of 131I in air samples from 19 subpacking rooms ranged from 0.087 to 570 Bq/m3, with an average of (51.04 ±128.58) Bq/m3. Those from 11 wards ranged from 0.162 to 54.6 Bq/m3, with an average of (7.97 ±15.89) Bq/m3. In terms of the work hours recommended by the national standard GBZ 129-2016 Specifications for individual monitoring of occupational internal exposure, the estimated annual effective dose to radiation workers due to the inhalation of 131I ranges from 0.002 to 10 mSv, with an average of (0.61 ±1.80) mSv, below the dose limit specified in the national standards.Conclusions The samples with high 131I activity concentration in nuclear medicine workplaces of 10 medical institutions selected in Zhengzhou are mostly distributed in tertiary class hospitals operating large amount of radionuclide with large numbers of thyroid cancer patients adimitted. The result ing internal dose to radiation workers cannot be ignored. Estimating the internal dose based on the measurement result of air samples has a large uncertainty.However, air sampling method can promptly detect radioactive contamination in case of abnormal events or accidents, providing early warning for workers to carry out dose measurement from external exposure and internal exposure assessment. |
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