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Nagaishi, Ryuji; Aoyagi, Noboru; Yamada, Reiji; Hatano, Yoshihiko; Yoshida, Zenko
no journal, ,
Promotion of chemical reactions by adding oxide particles to aqueous solution under the irradiation of ionizing radiations has been paid attention especially from the practical viewpoint, so that hydrogen production and decomposition of toxic organic compounds studied. On the other hand, redox of metal ions has not been studied very much since successive reactions after the redox become complicated. In the present study, reduction behavior of metal ions in aqueous solution systems irradiated by 
-ray and electron beam was measured, the reduced amount was compared with that by water radiolysis, and then the promotion of reduction by adding oxide particles was found out quantitatively. The application of reduction system to treatment of toxic substances in industry and environment, and to recovery of useful materials from high-level radioactive wastes (HLW), and the utilization of HLW as a radiation resource were also proposed.
Saiki, Seiichi*; Muroya, Yusa*; Kudo, Hisaaki*; Katsumura, Yosuke*; Nagasawa, Naotsugu; Yoshii, Fumio; Tamada, Masao
no journal, ,
Some kinds of polysaccharide derivatives in an aqueous solution, for example carboxymethyl cellulose (CMC) and carboxymethyl chitin/chitosan (CMCT/CMCTS) etc, become crosslinked and form hydrogels in case of concentrated solution. To study the early process of hydrogelation of polysaccharide derivatives by ionizing irradiation, we evaluated the reactivity of OH radical and hydrated electron with polymer chains by pulse radiolysis technique. And measuring absorbance at around 300 nm for about 1 hour, we confirmed the steady absorbance in case of CMCTS solution and the slow decay of absorbance in case of CMC. We assumed that some polymer radicals are produced after irradiation and diminish by some reactions. To study the change of the absorption spectrum, we measured the spectrum of these polymer solution after irradiation by ultraviolet-visible spectroscopy.
Kimura, Atsushi; Taguchi, Mitsumasa; Nagaishi, Ryuji; Hiratsuka, Hiroshi*; Kojima, Takuji
no journal, ,
no abstracts in English
Taguchi, Mitsumasa; Kojima, Takuji
no journal, ,
no abstracts in English
Zhao, C.*; Taguchi, Mitsumasa; Hirota, Koichi; Takigami, Machiko*; Kojima, Takuji
no journal, ,
no abstracts in English