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Report No.
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Studies on radiation effects on high-viscous fluids of co-precipitate and clay systems

Nagaishi, Ryuji ; Kuwano, Ryo*

The overflow from HIC at ALPS was owing to water radiolysis of beta rays in co-precipitate slurry of carbonate, leading to the volume increase of slurry and supernatant formation. The radiation effects (radiolysis and material degradation) on high-viscous fluids after long-term (high dose) irradiation is quite different from those on low-viscous fluids such as aqueous solutions. The understanding of effects on high-viscous fluids, containing suspension of clay which is planned to be used as a buffer material for final disposal, is important in long-term storage and disposal of radioactive wastes. In this study, the physical and viscosity properties of fluids of co-precipitate and clay systems were measured before and after irradiation of electron beam and gamma ray to discuss the relations among their properties quantitatively.

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