# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (5): 63

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

### Tritium concentrations in precipitation in Shanghai

Ke Deng 1,2 • Ling Wang 1 • Zheng-Hai Xia 4 • Yu-Hua Ma 2,3 • Lai-Lai Qin 1,2 • Qin Zhang 1,2 • Jia-Yu Liu 1,2 • Jian Yao 1 • Wei Liu 1,2

1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Science, Jiading campus, Shanghai 201800, China
2 University of Chinese Academy of Science, Beijing 100049, China
3 Shanghai Tech University, Shanghai 201210, China
4 CNCC Nuclear Power Operations Management Co Ltd, Haiyan 314300, China
• Contact: Jian Yao E-mail:yaojian@sinap.ac.cn
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Ke Deng, Ling Wang, Zheng-Hai Xia, Yu-Hua Ma, Lai-Lai Qin, Qin Zhang, Jia-Yu Liu, Jian Yao, Wei Liu. Tritium concentrations in precipitation in Shanghai.Nuclear Science and Techniques, 2018, 29(5): 63
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Abstract:

Tritium concentrations in precipitation can be used as a criterion to evaluate the tritium baseline of the environment. The tritium concentration in precipitation in Shanghai during 2014–2015 was determined. Values ranged from 0.68 ± 0.04 to 4.11 ± 0.39 Bq/L, and it showed a decreasing trend compared with historical data; however, the values were slightly higher than the natural background tritium level. Additionally, the tritium concentration shows a seasonal variation: It was higher in autumn and winter and lower in summer and spring. A comparison of concentrations in precipitation in Shanghai and around the Qinshan Nuclear Power Plant reveals no correlation, implying that the nuclear power plant operations may not affect the environment of Shanghai. Thus, the raised tritium concentrations in Shanghai might be due to the effects of monsoons, spring leak, raindrop, or other activities that generate tritium there. Those activities may include chemistry research that uses tritium as a tracer.

Key words: Tritium, Precipitation, Seasonality, Origin