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Yamaki, Tetsuya*; Goto, Mitsuaki*; Sawada, Shinichi*; Koshikawa, Hiroshi*; Kitamura, Akane; Higa, Mitsuru*
QST-M-8; QST Takasaki Annual Report 2016, P. 35, 2018/03
We prepared ion exchange membranes by a heavy-ion-track grafting method, and then used them for seawater concentration process. Both the water uptake and resistance were lower for our ion-track grafted membranes than for the conventional -ray-grafted membranes. The results would be because local and high-density energy deposition due to the ion beam enabled us to control the membrane structure in a nanometer scale. We demonstrate our membranes are suitable for this application.
Toh, Yosuke; Oshima, Masumi; Koizumi, Mitsuo; Osa, Akihiko; Kimura, Atsushi; Goto, Jun; Ebihara, Mitsuru*
AIP Conference Proceedings 769, p.1666 - 1669, 2005/05
no abstracts in English
Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Nishinaka, Ichiro; Hirata, Masaru; Yaita, Tsuyoshi; Ichikawa, Shinichi; Nagame, Yuichiro; et al.
Journal of the American Chemical Society, 126(16), p.5219 - 5224, 2004/04
Times Cited Count:43 Percentile:72.51(Chemistry, Multidisciplinary)Fluoride complexation of element 104, rutherfordium (Rf), produced in the Cm(O,5n)Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchangechromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the O-induced reactions on Ge and Gd targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effect on the fluoride complexation of Rf.
Tamai, Hiroshi; Matsukawa, Makoto; Kurita, Genichi; Hayashi, Nobuhiko; Urata, Kazuhiro*; Miura, Yushi; Kizu, Kaname; Tsuchiya, Katsuhiko; Morioka, Atsuhiko; Kudo, Yusuke; et al.
Plasma Science and Technology, 6(1), p.2141 - 2150, 2004/02
Times Cited Count:2 Percentile:6.49(Physics, Fluids & Plasmas)The dominant issue for the the modification program of JT-60 (JT-60SC) is to demonstrate the steady state reactor relevant plasma operation. Physics design on plasma parameters, operation scenarios, and the plasma control method are investigated for the achievement of high-. Engineering design and the R&D on the superconducting magnet coils, radiation shield, and vacuum vessel are performed. Recent progress in such physics and technology developments is presented.
Sakama, Minoru*; Asai, Masato; Tsukada, Kazuaki; Ichikawa, Shinichi; Nishinaka, Ichiro; Nagame, Yuichiro; Haba, Hiromitsu*; Goto, Shinichi*; Shibata, Michihiro*; Kawade, Kiyoshi*; et al.
Physical Review C, 69(1), p.014308_1 - 014308_11, 2004/01
Times Cited Count:21 Percentile:73.68(Physics, Nuclear)no abstracts in English
Ishida, Shinichi; Abe, Katsunori*; Ando, Akira*; Chujo, T.*; Fujii, Tsuneyuki; Fujita, Takaaki; Goto, Seiichi*; Hanada, Kazuaki*; Hatayama, Akiyoshi*; Hino, Tomoaki*; et al.
Nuclear Fusion, 43(7), p.606 - 613, 2003/07
no abstracts in English
Ishida, Shinichi; Abe, Katsunori*; Ando, Akira*; Cho, T.*; Fujii, Tsuneyuki; Fujita, Takaaki; Goto, Seiichi*; Hanada, Kazuaki*; Hatayama, Akiyoshi*; Hino, Tomoaki*; et al.
Nuclear Fusion, 43(7), p.606 - 613, 2003/07
Times Cited Count:33 Percentile:69.14(Physics, Fluids & Plasmas)no abstracts in English
Sakama, Minoru*; Tsukada, Kazuaki; Asai, Masato; Ichikawa, Shinichi; Haba, Hiromitsu; Goto, Shinichi*; Nishinaka, Ichiro; Nagame, Yuichiro; Oura, Yasuji*; Kojima, Yasuaki*; et al.
Journal of Nuclear Science and Technology, 39(Suppl.3), p.34 - 37, 2002/11
no abstracts in English
Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Goto, Shinichi*; Toyoshima, Atsushi; Nishinaka, Ichiro; Akiyama, Kazuhiko; Hirata, Masaru; Ichikawa, Shinichi; Nagame, Yuichiro; et al.
Journal of Nuclear and Radiochemical Sciences, 3(1), p.143 - 146, 2002/06
We have investigated the sorption behavior of element 104 rutherfordium (Rf) on an anion exchange resin from HCl and HNO solutions. In the HCl experiments, the distribution coefficients of Rf increase with an increase of HCl concentration from 7.0 M to 11.5 M, indicating that anionic species such as [Rf(OH)Cl] or [RfCl] are formed. This sorption behavior of Rf is typical of the group-4 elements Zr and Hf, and is quite different from that of the pseudo-homologue Th. It is also noted that the distribution coefficients decrease in the order Rf, Zr, Hf at 9.0 M HCl, which is consistent with the expected order of ionic radii. On the other hand, Rf appears to behave like Zr and Hf in 8 M HNO not like Pu and Th.
Sakama, Minoru*; Tsukada, Kazuaki; Asai, Masato; Ichikawa, Shinichi; Haba, Hiromitsu; Goto, Shinichi*; Oura, Yasuji*; Nishinaka, Ichiro; Nagame, Yuichiro; Shibata, Michihiro*; et al.
European Physical Journal A, 9(3), p.303 - 306, 2000/11
Times Cited Count:17 Percentile:66.14(Physics, Nuclear)no abstracts in English
JRR-2 Control Office; Kambara, Toyozo; Shoda, Katsuhiko; Hirata, Yutaka; Shoji, Tsutomu; Kohayakawa, Toru; Morozumi, Minoru; Kambayashi, Yuichiro; Shitomi, Hajimu; Kokanezawa, Takashi; et al.
JAERI 1027, 57 Pages, 1962/09
no abstracts in English
JRR-2 Critical Experiments Group; Kambara, Toyozo; Shoda, Katsuhiko; Hirata, Yutaka; Shoji, Tsutomu; Kohayakawa, Toru; Morozumi, Minoru; Kambayashi, Yuichiro; Shitomi, Hajimu; Kokanezawa, Takashi; et al.
JAERI 1025, 62 Pages, 1962/03
no abstracts in English
Goto, Mitsuaki*; Omori, Masayuki*; Yamaki, Tetsuya; Sawada, Shinichi; Koshikawa, Hiroshi; Kitamura, Akane; Higa, Mitsuru*
no journal, ,
We have prepared cation exchange membranes for applications to electrochemical energy-conversion devices by swift-heavy-ion irradiation, and then investigated their charge density, , a concentration of fixed charge groups, in comparison with that of the conventional -ray-grafted membranes. Poly(ethylene--tetrafluoroethylene) films with a 25 m thickness were irradiated in a vacuum chamber with 560 MeV Xe and subsequently immersed in a grafting solution containing sodium -styrenesulfonate at 60C. The charge density was estimated through the measurement of the membrane potential in an aqueous solution of potassium chloride. Our membranes exhibited higher charge density (reaching 2.40 mol/dm at maximum) than the -ray-grafted samples probably due to track structures characteristic of the bombarding heavy ions.
Goto, Mitsuaki*; Yamaki, Tetsuya; Koshikawa, Hiroshi; Sawada, Shinichi; Kitamura, Akane; Higa, Mitsuru*
no journal, ,
We have exploited a grafting technique with heavy-ion beams to create ion exchange membranes for various practical applications such as fuel cells and water desalination systems. In this study, instead of styrene that is a common monomer, sodium styrene sulfonate (SSS) was for the first time employed for this so-called ion-track grafting. A 25 m-thick poly(vinylidene fluoride) film was bombarded with 560 MeV Xe at a fluence of 3.010 or 1.010 ions/cm, and subsequently immersed in a SSS grafting solution at 60C. The charge density was estimated through the measurement of the membrane potential in an aqueous solution of potassium chloride. Our membranes exhibited higher charge density than the conventional or commercially-available samples probably due to track structures characteristic of the bombarding heavy ions.
Sawada, Shinichi*; Goto, Mitsuaki*; Koshikawa, Hiroshi*; Kitamura, Akane; Higa, Mitsuru*; Yamaki, Tetsuya*
no journal, ,
We prepared cation exchange membranes (CEMs) and anion exchange membranes (AEMs) by a heavy-ion-track grafting method, and then used them for seawater electrodialysis process. The concentration of the obtained seawater was higher than that in the case of the commercial CEM/AEM. This result demonstrates our CEMs and AEMs are suitable for this application.
Sawada, Shinichi*; Goto, Mitsuaki*; Koshikawa, Hiroshi*; Kitamura, Akane; Higa, Mitsuru*; Yamaki, Tetsuya*
no journal, ,
In this study, we prepared ion exchange membranes (CEMs) by our ion-track-grafting technique and investigated their ion and water transport properties. The CEM preparation involved irradiation of ethylene-co-tetrafluoroethylene films with 310 MeV Kr beam, grafting of styrene into the resulting latent tracks, and sulfonation of styrene units. Membrane resistance was measured by an AC impedance method. Osmotic-pressure-driven water flux was measured by using a permeation cell containing two compartments filled with pure water and an aqueous 3 mol/L NaCl solution. At higher IEC, the membrane resistance decreased, while the water flux increased. Interestingly, the water flux of the ion-track-grafted CEMs is significantly lower than that of commercially products and a conventional -ray-grafted CEM. This result demonstrates a great potential for industrial electrodialysis. In conclusion, unique one dimensional ionic channels achieved by the ion-track-grafting can facilitate Na+ transport and hinder water permeation.
Okuno, Yasuki; Okamoto, Tamotsu*; Goto, Yasuhito*; Akiyoshi, Masafumi*; Imaizumi, Mitsuru*; Kobayashi, Tomohiro*
no journal, ,
A solar cell type detector has features such as a thin film structure and no power supply drive by an internal electric field, and it is considered to be useful in a 1 F decommissioning environment. In this presentation, radiation behavior of InGaP and CdTe solar cells with high radiation resistance are reported.
Okuno, Yasuki; Imaizumi, Mitsuru*; Okamoto, Tamotsu*; Kobayashi, Tomohiro*; Akiyoshi, Masafumi*; Goto, Yasuhito*
no journal, ,
In the decommissioning of Fukushima Daiichi Nuclear Power Plant, it is important to specify the distribution and composition of the fuel debris by alpha ray dose analysis. InGaP solar cells is expected to detect alpha-rays because they have the thickness of about one micro meter, which is sufficiently thin with respect to the fly range of alpha-rays. Therefore, the ion irradiation tests with 5 MeV helium was conducted on InGaP solar cells, and the applicability of InGaP solar cells for alpha-ray detector was evaluated and discussed with the results of the experiment and simulation.
Okuno, Yasuki; Imaizumi, Mitsuru*; Okamoto, Tamotsu*; Kobayashi, Tomohiro*; Akiyoshi, Masafumi*; Goto, Yasuhito*
no journal, ,
The Fukushima Daiichi Nuclear Power Station needs to measure the high-level radiation environment near the core, but the ionization chamber, which is the existing product, has limited space where it can be used due to "size", "sensitivity", and "power supply". At present, the information of dose distribution and the estimation of debris position are not sufficiently obtained. Therefore, we have been developing a solar cell type radiation dosimeter as a powerless dosimeter instead of an ionization chamber. In this presentation, we will report on the development of a solar cell self-induced current dosimeter based on the current behavior, degradation behavior, temperature characteristics, etc. that have been elucidated so far.