Citation: LAN Tu, LIU Zhan-Xiang, LI Xing-Liang, LIAO Jia-Li, LUO Shun-Zhong, YANG Yuan-You, CHAI Zhi-Fang, LIU Ning, WANG Dong-Qi. Effect of Low-Enriched Uranium Targets Irradiation on Major Fission Elements and Uranium Speciation[J]. Chinese Journal of Inorganic Chemistry, ;2015, 31(9): 1774-1784. doi: 10.11862/CJIC.2015.245 shu

Effect of Low-Enriched Uranium Targets Irradiation on Major Fission Elements and Uranium Speciation

1.
1. Key Laboratory of Radiation Physics and Technology(Sichuan University), Ministry of Education;Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
2.
2. CAS Key Laboratory of Nuclear Radiation and Nuclear Techniques, Multidisciplinary Initiative Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
3.
3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China;
4.
4. School of Radiation Medicine and Interdisciplinary Sciences(RAD-X), Soochow University, Suzhou, Jiangsu 215123, China

Corresponding author: LIAO Jia-Li, WANG Dong-Qi,
Received Date: 10 April 2015
Available Online: 21 June 2015
Fund Project: 国家自然科学基金委员会和中国工程物理研究院联合基金(NSAF,No.U1330125) (NSAF,No.U1330125)特殊学科点资助项目(No.J1210004) (No.J1210004)国家自然科学基金委员会(No.91026000) (No.91026000)中国科学院百人计划(No.Y2291810S3)资助项目。 (No.Y2291810S3)

The speciation of uranium and effect of major fission products after low-enriched uranium targets being irradiated and solvated were analyzed using the geochemical program CHEMSPEC. The results indicate that the speciation of uranium in water is determined by pH value and the concentration of uranyl, and polynuclear complexes may be generated at high concentration of uranyl. Nitrate anion in the solution may interact with uranyl, and at high concentration of nitrate, uranyl exists as UO₂²⁺ and UO₂NO₃⁺. The presence of CO₂ at low concentrations of uranium brings substantial distribution uranyl carbonate, while this is negligible at high concentration of uranyl due to heavy hydrolysis and aggregation of uranyl. The calculations also show that the major fission products, Tc, I, and Mo, do not affect the speciation of uranium when their concentrations are below 0.01 mol·L^-1 and when they exist as TcO₄^-, I^-, MoO₄^2-.
- speciation;CHEMSPEC;uranium;fission element;irradiation
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