| Huang Lihua,Zheng Qishan,Zhang Yan,Zheng Senxin,Wei Weiqi.Preliminary study on assessment of internal dose to workers exposed to 131I radionuclide[J].Chinese Journal of Radiological Medicine and Protection,2021,41(12):898-905 |
| Preliminary study on assessment of internal dose to workers exposed to 131I radionuclide |
| Received:May 24, 2021 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.12.004 |
| KeyWords:Internal exposure Dose assessment Nuclear medicine 131I Radiopharmaceutical production |
| FundProject:福建省自然科学基金（2019J01094） |
| Author Name | Affiliation | E-mail | | Huang Lihua | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou, 350025, China | | | Zheng Qishan | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou, 350025, China | | | Zhang Yan | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou, 350025, China | | | Zheng Senxin | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou, 350025, China | | | Wei Weiqi | Fujian Center of Prevention and Control of Occupational Diseases and Chemical Poisoning, Fuzhou, 350025, China | fjwq2002@163.com |
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| Abstract:: |
| Objective To explore the assessment methodology for internal dose to workers exposed to 131I radionuclide. Methods Workers were chosen in a 131I radiopharmaceutial manufacturer and a nuclear medicine department in a hospital using 131I to treat hyperthyroidism and thyroid cancer. A portable high purity germanium (HPGe) gamma spectrometer was used to measure the content of 131I in the thyroid for 4 consecutive times in a period of 7 d. The internal dose was estimated combining with the work rotation mode for workers dealing with 131I. Results When the monitoring month was used as a typical month to estimate the internal dose, the annual committed effective dose was 0.09-1.93 mSv for the production staff engaged in the repackaging of 131I radiopharmaceuticals in the surveyed enterprise, and 0.06-0.58 mSv for the nuclear medicine staff in the surveyed hospital. After adjusting the monitoring result of the current monitoring period based on the rotation mode, the annual committed effective dose was estimated to be 0.06-1.22 mSv for radiopharmaceutical production workers and 0.03-0.15 mSv for nuclear medicine workers, respectively. Conclusions In the assessment of internal dose to radiation workers exposed to 131I, using a single time measurement result to estimate the annual dose would lead to a larger error. In the case of continuous monitoring, the result of subsequent monitoring periods should be corrected according to the result of previous monitoring periods. In order to accurately estimate the internal dose of workers exposed to 131I, it is necessary to take full account of the 131I exposure pattern, time and frequency and the internal contamination route. For workers who may be exposed to 131I with potential internal dose greater than 1 mSv/year, a 14 day-routine monitoring period was appropriate. |
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