Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (12): 120601-120601.

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

### Study on distribution of different forms of tritium in grassland around Qinshan nuclear power station

ZHANG Qin1,2, DU Lin1, MA Zhaowei1,2, YANG Guo1,2, WEI Fei1,2, ZHANG Mingjun1,2, LIU Wei1

1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
• Received:2018-07-20 Revised:2018-10-01 Online:2018-12-10 Published:2018-12-13
• Supported by:
Supported by National Natural Science Foundation of China (No.11705265, No.51606210, No.21601202)

Abstract: [Background] Tritium is one of emitted radioactive materials during the operation of nuclear facilities. Plants and soil are parts of the tritium ecological cycle. The distribution of tritium in plants and soil around nuclear facilities can be used to determine the short-term and long-term emissions of nuclear facilities.[Purpose] This study aims to analyze activities of tissue free water tritium (TFWT) and OBT in grasses and surface soils around Qinshan nuclear power station, and obtain the influence of the tritium emissions from Qinshan nuclear power station on the environment.[Methods] Tritium activities of different forms (HTO, TFWT and OBT) in grasses and surface soils around the Qinshan nuclear power station were sampled in several sites around Qinshan nuclear power station and stored in strict conditions during two years period from 2015 to 2016. Liquid Scintillation Counting (LSC) was employed to measure the tritium activity three times for samples collected in the same site.[Results] In the prevailing wind direction, the longer distance apart from the nuclear facility, the lower activities of TFWT in the grass and the tritiated water (HTO) in the surface soil. In the two-year grass samples' results, the total amount of OBT was in the same level and distribution of OBT was consistent. The OBT distribution in the surface soil was different from the HTO in the surface soil and the OBT in the grass. The ratio of OBT/HTO in the surface soil was significantly higher than the ratio in the grass, indicating that the source, formation, migration and transformation of OBT in the soil was different from those in the grass.[Conclusion] The HTO activity in surface soil and TFWT activity in grassland can reflect the short-term tritium emissions from nuclear power plant. Meanwhile, the OBT activity in grassland can reflect the long-term tritium emissions from nuclear power plant.

CLC Number:

• TL751