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Journal Articles

Radiolysis of boiling water

Yang, S.*; Katsumura, Yosuke*; Yamashita, Shinichi*; Matsuura, Chihiro*; Hiroishi, Daisuke*; Lertnaisat, P.*; Taguchi, Mitsumasa

Radiation Physics and Chemistry, 123, p.14 - 19, 2016/06

https://doi.org/10.1016/j.radphyschem.2016.02.008
 Times Cited Count：2 Percentile：19.71(Chemistry, Physical)

$$gamma$$-radiolysis of boiling water has been investigated. The G-value of H$$_{2}$$ evolution was found to be very sensitive to the purity of water. In high-purity water, both H$$_{2}$$ and O$$_{2}$$ gases were formed in the stoichiometric ratio of 2:1; a negligible amount of H$$_{2}$$O$$_{2}$$ remained in the liquid phase. The G-values of H$$_{2}$$ and O$$_{2}$$ gas evolution depend on the dose rate: lower dose rates produce larger yields. To clarify the importance of the interface between liquid and gas phase for gas evolution, the gas evolution under Ar gas bubbling was measured. A large amount of H$$_{2}$$ was detected, similar to the radiolysis of boiling water. The evolution of gas was enhanced in a 0.5 M NaCl aqueous solution. Deterministic chemical kinetics simulations elucidated the mechanism of radiolysis in boiling water.

Journal Articles

Pulse radiolysis of sodium formate aqueous solution up to 400 $$^{circ}$$C; Absorption spectra, kinetics and yield of carboxyl radical CO$$_{2}^{cdot}$$$$^{-}$$

Lin, M.; Katsumura, Yosuke; Muroya, Yusa*; He, H.*; Miyazaki, Toyoaki*; Hiroishi, Daisuke*

Radiation Physics and Chemistry, 77(10-12), p.1208 - 1212, 2008/10

https://doi.org/10.1016/j.radphyschem.2008.05.017
 Times Cited Count：24 Percentile：81.47(Chemistry, Physical)

Sodium formate neutral aqueous solutions saturated with N$$_{2}$$O were studied by pulse radiolysis techniques from room temperature to 400 $$^{circ}$$C. The absorption spectra of CO$$_{2}^{cdot}$$$$^{-}$$ show a red shift from $$lambda$$$$_{rm max}$$ = 235 nm at 25 $$^{circ}$$C to 280 nm at 400 $$^{circ}$$C. The second-order decay of CO$$_{2}^{cdot}$$$$^{-}$$ is not monotonically temperature-dependent: the rate constant (2${it k}$/$$varepsilon$$) slightly increases with temperature up to 200 $$^{circ}$$C, then decreases to a valley at 300 $$^{circ}$$C, and it sharply increases again for temperature $$>$$ 350 $$^{circ}$$C. ${it G}$ $$times$$ $$varepsilon$$(CO$$_{2}^{cdot}$$$$^{-}$$) increases with temperature from room temperature to 400 $$^{circ}$$C. Significant density effect on ${it G}$ $$times$$ $$varepsilon$$(CO$$_{2}^{cdot}$$$$^{-}$$) is found at 400 $$^{circ}$$C. Assumed $$varepsilon$$(CO$$_{2}^{cdot}$$$$^{-}$$) is independent on temperature, at 400 $$^{circ}$$C, the density dependence of ${it G}$(CO$$_{2}^{cdot}$$$$^{-}$$) in the presence of N$$_{2}$$O agrees well with that of [${it G}$(e$$_{rm aq}^{-}$$)+${it G}$(H$$^{.}$$)+${it G}$($$^{.}$$OH)].

Oral presentation

Online yield measurement of H$$_{2}$$ produced in water radiolysis

Yamashita, Shinichi; Katsumura, Yosuke; Hiroishi, Daisuke*; Murakami, Takeshi*

no journal, , 

Yield of dihydrogen molecule (H$$_{2}$$) produced in water radiolysis is important for safety management in nuclear industry including water chemistry in nuclear fission reactors as well as for investigation of very early stages of radiation-induced phenomena, which are closely related to spatial distribution of energy deposition from charged particle to surrounding matter. A new apparatus for online measurements of H$$_{2}$$ produced in water radiolysis, and the apparatus was utilized for $${gamma}$$-irradiation. By improving tubing between a sample cell and thermal conductivity detector, which are settled inside and outside the irradiation room, respectively, sensitivity and accuracy of the system has much improved and resultant H$$_{2}$$ yield was almost same as those reported in literatures.

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