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Cs activity concentration in the aquatic insect 
(Tricoptera: Stenopsychidae) in the Ota River, Fukushima, JapanIshii, Yumiko*; Miura, Hikaru*; Jo, J.*; Tsuji, Hideki*; Saito, Rie*; Koarai, Kazuma; Hagiwara, Hiroki; Urushidate, Tadayuki*; Nishikiori, Tatsuhiro*; Wada, Toshihiro*; et al.
PLOS ONE (Internet), 17(5), p.e0268629_1 - e0268629_17, 2022/05
Times Cited Count：10 Percentile：42.85(Multidisciplinary Sciences)We investigated the variability in Cs activity concentration in individual aquatic insects in detritivorous caddisfly () and carnivorous dobsonfly (
) larvae from the Ota River, Fukushima. Caddisfly larvae showed sporadically higher radioactivity, whereas no such outliers were observed in dobsonfly larvae. Autoradiography and scanning electron microscopy analyses confirmed that these caddisfly larvae samples contained radiocesium-bearing microparticles (CsMPs), which are insoluble Cs-bearing silicate glass particles. CsMPs were also found in potential food sources of caddisfly larvae, such as periphyton and drifting particulate organic matter, indicating that larvae may ingest CsMPs along with food particles of similar size. Although CsMPs distribution and uptake by organisms in freshwater ecosystems is relatively unknown, our study demonstrates that CsMPs can be taken up by aquatic insects.
Igarashi, Yasuhito*; Kogure, Toshihiro*; Kuribara, Yuichi; Miura, Hikaru*; Okumura, Taiga*; Satou, Yukihiko; Takahashi, Yoshio*; Yamaguchi, Noriko*
Journal of Environmental Radioactivity, 205-206, p.101 - 118, 2019/09
Times Cited Count：92 Percentile：66.45(Environmental Sciences)Scientists face challenge in identifying the radioactive materials which are found as dotted images on various imaging plate (IP) autoradiographic photos of radioactively contaminated materials by the Fukushima Dai-ichi Nuclear Power Plant (F1NPP, or FDNPP) accident, such as air filter, fugitive dust, surface soil, agricultural materials, and water-shed samples. It has been revealed that they are minute particles with distinct morphology and elemental composition with high specific radioactivity, and different from those of the so-called Chernobyl hot particles. Basically, they are glassy particles once molten, composed of Si, O, Fe, Zn etc. with highly concentrated radiocaesium, which can be called as radiocaesium-bearing microparticles (CsMP). At present, CsMP can be classified into two types, Types-A and -B, which are characterized by different specific radioactivity, 
Cs/Cs ratio, size and morphology, and geographic distribution around F1NPP. Such studies on the CsMP from various aspects have provided valuable information about what happened in the nuclear reactors during the F1NPP accident and fates of the CsMP in the environment. This review first provides a retrospective view on the research history of the CsMP, which is helpful to understand the unique character of the CsMP. Subsequently, more details about the current understanding of the natures of these hot particles, such as origin, morphology, chemical compositions, thermal properties, water-solubility, and secondary migration of CsMP in river and ocean systems are described with future prospects.
with perovskite- and LiNbO-type structuresInaguma, Yoshiyuki*; Tanaka, Kie*; Tsuchiya, Takeshi*; Mori, Daisuke*; Katsumata, Tetsuhiro*; Oba, Tomonori*; Hiraki, Koichi*; Takahashi, Toshihiro*; Saito, Hiroyuki
Journal of the American Chemical Society, 133(42), p.16920 - 16929, 2011/09
Times Cited Count：104 Percentile：87.62(Chemistry, Multidisciplinary)Uosaki, Kohei*; Morita, Jun*; Katsuzaki, Tomoko*; Takakusagi, Satoru*; Tamura, Kazuhisa; Takahashi, Masamitsu; Mizuki, Junichiro; Kondo, Toshihiro*
Journal of Physical Chemistry C, 115(25), p.12471 - 12482, 2011/06
Times Cited Count：13 Percentile：37.24(Chemistry, Physical)Ag/AgCl reaction at the Ag bilayer, which was underpotentially prepared on a Au(111) surface, was investigated using electrochemical quartz crystal microbalance (EQCM), scanning tunneling microscopy (STM), surface X-ray scattering (SXS), and electrochemical techniques. When the potential was scanned positively from -200 mV, the Cl
ion was adsorbed on the Au(111) electrode surface around 0 mV, and then the phase transition of the adsorbed Cl ion layer from random orientation to (
) structure took place at around +130 mV. The Ag bilayer and Cl ions were oxidatively reacted to form the AgCl monolayer with (
) 
13.9
structure around +200 mV, accompanied with the formation of AgCl monocrystalline clusters on the AgCl monolayer surface. The structure of the AgCl monolayer on the Au(111) surface was changed from ( )R13.9 structure to (44) structure around +500 mV.
Takahashi, Masamitsu; Tamura, Kazuhisa; Mizuki, Junichiro; Kondo, Toshihiro*; Uosaki, Kohei*
Journal of Physics; Condensed Matter, 22(47), p.474002_1 - 474002_9, 2010/12
Times Cited Count：14 Percentile：50.40(Physics, Condensed Matter)Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Kondo, Toshihiro*; Tamura, Kazuhisa; Takakusagi, Satoru*; Kitamura, Ken*; Takahashi, Masamitsu; Mizuki, Junichiro; Uosaki, Kohei*
Journal of Solid State Electrochemistry, 13(7), p.1141 - 1145, 2009/07
Times Cited Count：6 Percentile：13.86(Electrochemistry)The interfacial structures of Ag bilayer prepared by underpotential deposition on Au(111) were determined by STM and SXS before and after oxidative adsorption and after desorption of a SAM of C
SH in alkaline ethanol solution. While no structural change was observed after oxidative formation of CSH SAM on the Ag/Au(111) in an ethanol solution containing 20 mM KOH and 0.1 mM CSH, some of the Ag atoms in the bilayer were stripped when the SAM was reductively desorbed.
Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.
Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06
Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.
Kondo, Toshihiro*; Morita, Jun*; Hanaoka, Kazuya*; Takakusagi, Satoru*; Tamura, Kazuhisa; Takahashi, Masamitsu; Mizuki, Junichiro; Uosaki, Kohei*
Journal of Physical Chemistry C, 111(35), p.13197 - 13204, 2007/09
Times Cited Count：103 Percentile：90.69(Chemistry, Physical)Potential-dependent surface structures of Au(111) and Au(100) single-crystal electrodes in a 50 mM H
SO
solution were investigated at an atomic level using in situ surface X-ray scattering (SXS) techniques. It was confirmed that both the Au(111) and Au(100) surfaces were reconstructed with an attached submonolayer of an oxygen species, most probably water, at 0 V (vs Ag/AgCl). Results at +0.95 V supported a previously suggested model for both the Au(111) and the Au(100) electrodes that, based on infrared and scanning tunneling microscopy measurements, the surfaces were a (11) structure with the coadsorbed sulfate anion and hydronium cation (HO
). At +1.05 V, where a small amount of an anodic current flowed, adsorption of a monolayer of oxygen species was observed on both surfaces.
Kondo, Toshihiro*; Tamura, Kazuhisa*; Takahashi, Masamitsu; Mizuki, Junichiro; Uosaki, Kohei*
Electrochimica Acta, 47(19), p.3075 - 3080, 2002/07
Times Cited Count：32 Percentile：57.64(Electrochemistry)A nwely designed spectroelectrochemical cell was constructed for surface X-ray scattering (SXS) to study single crystal electrodes. Electrochemical characteristics of a specific face of a single crystal electrode can be investigated in the meniscus mode, adn SXS measurement can be easily carried out using the spectroelectrochemical cell. The usefulness of the present cell was demonstrated by studying the electrochemical deposition of Pd thin layers on Au(111) and Au(001) that require precise amounts of Pd deposits.
Ikeda, Yoshitaka; Ide, Shunsuke; Suzuki, Takahiro; Kasugai, Atsushi; Takahashi, Koji; Kajiwara, Ken; Isayama, Akihiko; Oikawa, Toshihiro; Hamamatsu, Kiyotaka; Kamada, Yutaka; et al.
Nuclear Fusion, 42(4), p.375 - 382, 2002/04
Times Cited Count：29 Percentile：63.92(Physics, Fluids & Plasmas)no abstracts in English
H-mode discharges in JT-60UIsayama, Akihiko; Kamada, Yutaka; Ozeki, Takahisa; Ide, Shunsuke; Fujita, Takaaki; Oikawa, Toshihiro; Suzuki, Takahiro; Neyatani, Yuzuru; Isei, Nobuaki; Hamamatsu, Kiyotaka; et al.
Nuclear Fusion, 41(6), p.761 - 768, 2001/06
Times Cited Count：53 Percentile：79.93(Physics, Fluids & Plasmas)no abstracts in English
Takahashi, Masamitsu; Mizuki, Junichiro; Tamura, Kazuhisa*; Kondo, Toshihiro*; Uosaki, Kohei*
Shinku, 44(3), P. 375, 2001/03
no abstracts in English
Ikeda, Yoshitaka; Kasugai, Atsushi; Takahashi, Koji; Kajiwara, Ken; Isayama, Akihiko; Ide, Shunsuke; Terakado, Masayuki; Shinozaki, Shinichi; Yokokura, Kenji; Anno, Katsuto; et al.
Fusion Engineering and Design, 53(1-4), p.351 - 363, 2001/01
Times Cited Count：40 Percentile：91.13(Nuclear Science & Technology)no abstracts in English
Isayama, Akihiko; Ikeda, Yoshitaka; Ide, Toshiyuki; Suzuki, Takahiro; Moriyama, Shinichi; Takahashi, Koji; Kajiwara, Ken; Oikawa, Toshihiro; Hamamatsu, Kiyotaka; Kamada, Yutaka; et al.
AIP Conference Proceedings 595, p.267 - 274, 2001/00
no abstracts in English
Takahashi, Masamitsu; Hayashi, Yukio; Mizuki, Junichiro; Tamura, Kazuhisa*; Kondo, Toshihiro*; Naohara, Hideo*; Uosaki, Kohei*
Surface Science, 461(1-3), p.213 - 218, 2000/08
Times Cited Count：72 Percentile：91.60(Chemistry, Physical)no abstracts in English
H-mode discharges in JT-60UIsayama, Akihiko; Kamada, Yutaka; Ozeki, Takahisa; Ide, Shunsuke; Fujita, Takaaki; Oikawa, Toshihiro; Suzuki, Takahiro; Neyatani, Yuzuru; Isei, Nobuaki; Hamamatsu, Kiyotaka; et al.
IAEA-CN-77/EXP3/03 (CD-ROM), 5 Pages, 2000/00
no abstracts in English
Ikeda, Yoshitaka; Fujita, Takaaki; Hamamatsu, Kiyotaka; Ide, Shunsuke; Imai, Tsuyoshi; Isayama, Akihiko; Iwase, Makoto; Kasugai, Atsushi; Kondoh, Takashi; Kusama, Yoshinori; et al.
AIP Conference Proceedings 485, p.279 - 287, 1999/09
no abstracts in English
Lin, W.*; Hirahara, Noboru; Nishida, Kaoru*; Takahashi, Manabu*; Sakaki, Toshihiro
Nihon Suimon Kagakkai-Shi, 29(4), p.189 - 204, 1999/00
None
Yamane, Yuichi; Takahashi, Satoshi*; Yamamoto, Toshihiro*; Miyoshi, Yoshinori
no journal, ,
no abstracts in English
