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Oral presentation

Experimental evaluation of primary yields of water radiolysis in seawater and its concentrated systems

Nagaishi, Ryuji; Kondo, Takafumi*; Godo, Masao*; Yoshida, Yoichi*; Inoue, Masao

no journal, , 

no abstracts in English

Oral presentation

Estimation of material balance of radiolysis products in aqueous chloride solution systems

Nagaishi, Ryuji; Inoue, Masao*; Kondo, Takafumi*; Godo, Masao*; Yoshida, Yoichi*; Kuwano, Ryo*

no journal, , 

no abstracts in English

Oral presentation

Radiolysis studies on H$$_{2}$$ retention with changing hydrophilicity of carbonate slurry, 2; Pulse radiolysis measurement of local (partial) viscosity of pore water

Nagaishi, Ryuji; Kuwano, Ryo*; Ito, Tatsuya; Godo, Masao*; Yoshida, Yoichi*; Tamaki, Ryoya*

no journal, , 

Hydrogen molecules (H$$_{2}$$) retained by highly viscous suspension such as a carbonate slurry exist in the pore water of suspension in the form of gas (bubble). The H$$_{2}$$ behaviors such as the reaction of dissolved species of H$$_{2}$$ and the process forming H$$_{2}$$ bubble are mainly determined by the viscosity of pore water, while the H$$_{2}$$ retention by the macroscopic viscosity of suspension. Such local (partial) viscosity is generally unclear. In order to clarify the H$$_{2}$$ retention/release mechanism in the suspension, it is important to estimate this viscosity. In this report as the second in a series of presentations, the reaction (decay) rate of hydrated electrons (e$$_{aq}$$$$^{-}$$) formed as a radiolysis radical of pore water was transiently measured by using ns-pulse radiolysis, and the viscosity of pore water was estimated for the current and hydrophilicity-lowered slurries to be compared with each other.

Oral presentation

Studies on reproducibility and simulation of radiolysis of seawater with simple aqueous solutions

Nagaishi, Ryuji; Ito, Tatsuya; Kuwano, Ryo*; Godo, Masao*; Yoshida, Yoichi*

no journal, , 

Since seawater has been used as emergency cooling water in the 1F accident, knowledge about radiolysis of seawater became important after the accident. In the experimental studies, simulated seawater and aqueous solutions containing halides have been used instead of seawater to elucidate individual events and phenomena and to obtain data. However, it has not been quantitatively clarified whether the radiolysis of seawater is reproduced as a whole. Therefore, in this study, in order to clarify the reproducibility from the initial process of radiolysis to the formation and reaction processes of final products, the transient absorption of radical products was observed using pulse radiolysis, and the molecular products hydrogen and hydrogen peroxide were measured by final product analysis. Based on these experimental results on the radiolysis of seawater, simulated seawater or an aqueous solution containing halides was compared with (natural) seawater.

Oral presentation

Investigation of the effect of radiation-resistant resin on radiolysis of aqueous solutions

Ito, Tatsuya; Nagaishi, Ryuji; Kuwano, Ryo*; Godo, Masao*; Tamaki, Ryoya*

no journal, , 

The use of radiation-resistant resins becomes increasing as vessels for irradiation experiments. Polyimide (Kapton) was used on surfaces in contact with water in our radiolysis experiments, but the obtained results were not same to that when glass vials were used. In this study, to investigate the effect of resin on water radiolysis, the amounts of dichromate reduction and H$$_{2}$$O$$_{2}$$ formation after gamma-irradiation were compared in the presence or absence of resin in the aqueous solutions. The presence of resins increased the reduction but hardly changed the formation. Therefore, the reduction caused by radiolysis in aqueous solution was suggested to be promoted by the presence of resins. The promotion was further studied using pulse radiolysis, etc.

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