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Deep groundwater physicochemical components affecting actinide migration
Akira Kirishima1, Mariko Terasaki2, Kazuya Miyakawa3
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 1-1 Katahira, 2-chome, Aoba-ku, Sendai, 980-8577, Japan.
Actinide migration in deep groundwater is influenced by phosphate and hydroxide/hydroxocarbonate complexation. Understanding these interactions is crucial for predicting the behavior of minor actinides in geological repositories.
Area of Science:
- Geochemistry
- Environmental Science
- Nuclear Waste Management
Background:
- Understanding actinide migration in deep groundwater is essential for nuclear waste disposal.
- Groundwater composition significantly impacts the behavior of actinides.
Purpose of the Study:
- Investigate interactions between actinide tracers (La, Sm, Ho, U) and deep groundwater components.
- Determine the effect of groundwater composition on actinide chemical speciation.
Main Methods:
- Doping tracers into groundwater from Horonobe and Mizunami Underground Research Laboratories.
- Sequential filtration and analysis using ICP-MS, TOF-SIMS, and XAFS.
- Evaluating tracer retention and chemical species on filters.
Main Results:
- Lanthanide migration in Horonobe groundwater was controlled by phosphate content.
- A fraction of lanthanides and actinides formed hydroxides/hydroxocarbonates in Mizunami groundwater.
Conclusions:
- Phosphate complexation likely controls minor actinide solubility in sedimentary rock groundwater.
- Hydroxide/hydroxocarbonate formation influences actinide speciation in crystalline rock groundwater.
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