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Nagaishi, Ryuji; Kumagai, Yuta; Aoyagi, Noboru; Yamagishi, Isao; Nishihara, Kenji
no journal, ,
no abstracts in English
Chen, J.; Zhai, M.*; Asano, Masaharu; Maekawa, Yasunari
no journal, ,
Ion exchange membrane (IEM) is one of the key components in electrochemical systems such as electrodialysis, electrolysis and fuel cells. The commercialized perfluorinated IEMs are expensive and environmental unfriendly. We focused our study on developing fluorine-free hydrocarbon IEMs by radiation techniques with low cost, and several polyetheretherketone (PEEK)-based IEMs were prepared. These IEMs was tested in fuel cell and electrodialysis systems.
-radiolysis of water in the presence of Y-type zeoliteKumagai, Yuta; Kimura, Atsushi; Yamada, Reiji; Nagaishi, Ryuji; Taguchi, Mitsumasa
no journal, ,
The production of hydrogen and hydrogen peroxide by water radiolysis is one of the important radiation effects in aqueous processes under ionizing radiation environments. In order to understand the radiation influences on the water processes of radioactive waste water by zeolite adsorbents, we studied the production of hydrogen and hydrogen peroxide by the radiolysis of water in the presence of Y-type zeolite. The hydrogen production from the mixture was relatively higher than that expected from the amount of aqueous solution in the samples. The results show that the presence of the Y-type zeolite caused an additional production of hydrogen. In contrast, the production of hydrogen peroxide decreased in the presence of the Y-type zeolite. The results suggest that hydrogen peroxide was decomposed by radiation-induced reactions on the surface of the Y-type zeolite. In addition, the production of oxygen in association with the production of hydrogen is expected from the mass balance.
Yamashita, Shinichi; Hiroki, Akihiro; Nagasawa, Naotsugu; Murakami, Takeshi*; Taguchi, Mitsumasa
no journal, ,
We developed a new polymer gel dosimeter. 2-Hydroxyethyl methacrylate (HEMA) and polyethylene glycol dimethacrylate (9G), which are less toxic than methacrylic acid or acrylamide, were used as constituents polymerizing after irradiations. A cellulose derivative, hydroxypropyl cellulose (HPC), was selected and crosslinked to form gel matrix by an irradiation of 2-MeV electron beam, which doesn't soften at higher temperature. Hydrogel of HPC is enough transparent to observe light scattering and absorption of products of radiation-induced polymerization. As a result of 
Co -ray irradiation of a few Gy, white turbidity arisen inside the gel, detailed behavior of which depended on composition of constituent monomers. It appeared at rather lower dose and its increase saturated at around 10 Gy of -irradiation when 9G was predominant. In order to quantify the degree of white turbidity, haze measurement and UV-vis absorption spectrometry were conducted. In addition, white turbidity evolution was also confirmed after irradiations of therapeutic C ion beam of 135 MeV/u although degree of white turbidity was less clear than that observed after -irradiation.
Iwamatsu, Kazuhiro; Taguchi, Mitsumasa; Sugo, Yumi; Kurashima, Satoshi; Yamashita, Shinichi; Katsumura, Yosuke
no journal, ,
The G-values increased with the increase in concentration of bromide ion, correspond to the earlier scavenging time of OH. Furthermore, the G-values decreased with the atomic mass unit of ions. The yield of OH decreases as the time or as the radical density increases. Our results are consistent with them. However our results of heavier ion are not consistent with theoretical analysis of OH yield. Precise analyses are in progress.