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| Estimation and evaluation of public exposure dose caused by clinical use of 14C urea capsules for diagnosis |
| JIN Xiao, YAN Yuan |
| China Institute of Atomic Energy, Beijing 102413 China |
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Abstract Objective To estimate and evaluate the public exposure dose caused by clinical use of 14C urea capsules for diagnosing Helicobacter pylori.Methods By collecting and sorting data of the quantity of 14C urea capsules supplied nationwide, the annual emission of gaseous 14C caused by clinical use of 14C urea capsules was estimated, and an appropriate model was established to estimate the public exposure dose.Results After normalized by 3.70×104Bq intake for each diagnosis case, the release rate was 1.18×10-3Bq/s under the premise that all 14C was exhaled. The results showed that the maximum normalized individual annual dose was 7.53×10-11Sv/a·case and the critical exposure pathway was ingestion of the animal and plant products. The collective public dose caused by all the 14C urea capsules used nationwide was 1.82×102Sv·person/a.Conclusion The clinical use of 14C urea capsules caused little public exposure dose, but considering the large amount of them used throughout the country, public exposure caused by such activities is well worth concerning.
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Received: 10 June 2019
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