| Xiong Qiang,Yan Linlin,Chen Fei,Yang Shengyuan,Yang Hailan,Zhang Zhen.Analytical method for 14C in urine[J].Chinese Journal of Radiological Medicine and Protection,2021,41(11):843-846 |
| Analytical method for 14C in urine |
| Received:May 26, 2021 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.11.008 |
| KeyWords:14C β-emitters Urine sample Internal exposure |
| FundProject:环境放射性研究网络中心国际合作项目（I-21-18）；天津市自然科学基金重点项目（19JCZDJC40500） |
| Author Name | Affiliation | E-mail | | Xiong Qiang | National Center for Occupational Safety and Health, National Health Commission of the People's Republic of China, Beijing 102308, China | | | Yan Linlin | School of Public Health, Hengyang Medical School, University of South China, Hengyang 421001, China | | | Chen Fei | National Center for Occupational Safety and Health, National Health Commission of the People's Republic of China, Beijing 102308, China | chenf_irm@126.com | | Yang Shengyuan | School of Public Health, Hengyang Medical School, University of South China, Hengyang 421001, China | | | Yang Hailan | China Institute for Radiation Protection, Taiyuan 030006, China | | | Zhang Zhen | National Center for Occupational Safety and Health, National Health Commission of the People's Republic of China, Beijing 102308, China | |
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| Abstract:: |
| Objective To improve the analytical method of radionuclide 14C, and estimate the internal dose caused by 14C to human, in order to protect the health of workers and the public in workplaces involving potential 14C exposure. Methods Urine samples were pretreated by wet oxidation. In the analysis, potassium persulfate was used as an oxidant to decompose urea into carbon dioxide, which was absorbed by 1 mol/L sodium hydroxide, and the absorption solution was converted into calcium carbonate precipitation. After calcium carbonate powder was prepared into sample source by suspension method, the low background liquid scintillation counter was applied to measure the radioactivity, which can be used for calculating the result. Results The reaction time optimized by using carbamide as carrier was 1 h. For 80 ml urine, the amount of potassium persulfate used was 10 g. The method recovery rate reached about 100%. Four real urine samples were tested using the optimized method, and the result of activity concentration 14C was 0.32, 0.60, 0.86 and 0.74 Bq/L, respectively. Conclusions The optimized method had good stability, high accuracy and stable experimental result, which could meet the needs of routine radiological detection. The establishment of a quantitative method for 14C in urine sample has improved the methodological system for 14C monitoring. |
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