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Yang, S.*; Katsumura, Yosuke*; Yamashita, Shinichi*; Matsuura, Chihiro*; Hiroishi, Daisuke*; Lertnaisat, P.*; Taguchi, Mitsumasa
Radiation Physics and Chemistry, 123, p.14 - 19, 2016/06
Times Cited Count：2 Percentile：19.71(Chemistry, Physical)
-radiolysis of boiling water has been investigated. The G-value of H
evolution was found to be very sensitive to the purity of water. In high-purity water, both H and O gases were formed in the stoichiometric ratio of 2:1; a negligible amount of HO remained in the liquid phase. The G-values of H and O 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 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.
Idesaki, Akira; Morishita, Norio; Ito, Hisayoshi; Kamiya, Tomihiro; Nakamoto, Tatsushi*; Kimura, Nobuhiro*; Makida, Yasuhiro*; Ogitsu, Toru*; Ohata, Hirokatsu*; Yamamoto, Akira*
AIP Conference Proceedings 824, p.330 - 334, 2006/03
Polyimide films and glass fiber reinforced plastics (GFRPs) are used as insulating or structural materials for superconducting magnets in a neutrino beam line of the Japan Proton Accelerator Research Complex (J-PARC). It is indispensable to evaluate radiation resistance of these materials, because they are required to keep their electrical and mechanical properties in a high radiation field of 30 kGy/year at low temperature of 4 K. In this work, the gas evolution resulting from chemical reactions induced in the polyimide films and GFRPs by ray irradiation at 77 K was investigated. It was found that the main component of the evolved gas is hydrogen. The amount of hydrogen evolved from the superconducting magnet system used in the neutrino beam line was estimated to be 0.37 mol/year (0.01 L/year as the volume of liquid hydrogen). It indicates that the hydrogen evolved from the organic materials does not influence on the operation of the helium purifying system.
Haruyama, Yasuyuki; Sunaga, Hiromi; Arakawa, Kazuo; Seguchi, Tadao
JAERI-Tech 2002-084, 105 Pages, 2002/11
JAERI-Tech-2002-084.pdf:2.01MB
no abstracts in English
Seguchi, Tadao
Hoshasen To Sangyo, 0(66), p.4 - 8, 1995/00
no abstracts in English
Seguchi, Tadao; Sugimoto, Masaki*; Okamura, K.*
High Temperature Ceramic Matrix Composites; 6th European Conf. on Composite Materials: HT-CMC, p.51 - 57, 1993/00
no abstracts in English
*; *; *; Yagi, Toshiaki; Seguchi, Tadao
Proc. on the Electrical Electronics Insulation Conf. and Electrical Manufacturing & Coil Winding Conf., p.703 - 706, 1993/00
no abstracts in English
Seguchi, Tadao; Kasai, Noboru; Okamura, K.*
Proceedings of the International Conference on Evolution in Beam Applications, p.702 - 706, 1992/00
no abstracts in English
*; Nishii, Masanobu; Seguchi, Tadao; *; *
Radiation Physics and Chemistry, 37(2), p.213 - 216, 1991/00
no abstracts in English
Arakawa, Kazuo
Journal of Polymer Science, Part A-1, 25, p.1713 - 1716, 1987/00
no abstracts in English
Arakawa, Kazuo; Seguchi, Tadao; Yoshida, Kenzo
Radiation Physics and Chemistry, 27(2), p.157 - 163, 1986/00
no abstracts in English
*; Seguchi, Tadao
EIM-85-155, p.19 - 30, 1985/00
no abstracts in English
Arakawa, Kazuo; Seguchi, Tadao; Hayakawa, Naohiro; Machi, Sueo
Journal of Polymer Science; Polymer Chemistry Edition, 21, p.1173 - 1181, 1983/00
no abstracts in English
Arakawa, Kazuo; Nakanishi, Hiroshi*; Hayakawa, Naohiro
Nucl.Techonl., 61, p.533 - 539, 1983/00
Times Cited Count：2 Percentile：35.16(Nuclear Science & Technology)no abstracts in English
Arakawa, Kazuo; Seguchi, Tadao; ; Hayakawa, Naohiro
Journal of Polymer Science; Polymer Chemistry Edition, 20, p.2681 - 2692, 1982/00
no abstracts in English
E.A.Hegazy*; Seguchi, Tadao; Machi, Sueo
J.Appl.Polym.Sci., 26, p.2947 - 2957, 1981/00
Times Cited Count：40 Percentile：87.93(Polymer Science)no abstracts in English
