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Journal Articles

Electrochemical studies of uranium (IV) in an ionic liquid-DMF mixture to build a redox flow battery using uranium as an electrode active material

Ouchi, Kazuki; Komatsu, Atsushi; Takao, Koichiro*; Kitatsuji, Yoshihiro; Watanabe, Masayuki

Chemistry Letters, 50(6), p.1169 - 1172, 2021/06

https://doi.org/10.1246/cl.210060
 Times Cited Count：2 Percentile：14.19(Chemistry, Multidisciplinary)

The electrochemical behavior of uranium (IV) tetrachloride in ionic liquid-DMF mixture was studied for first time in order to build a redox flow battery (RFB) using U as an electrode active material. We found a quasi-reversible U$$^{III}$$/U$$^{IV}$$ couple that could be applied to the anode reaction of the RFB.

Journal Articles

Frontline of R&D for decommissioning and waste disposal, 1; R&D for processing and disposal of low-level radioactive waste and closure of uranium mine

Tsuji, Tomoyuki; Sugitsue, Noritake; Sato, Fuminori; Matsushima, Ryotatsu; Kataoka, Shoji; Okada, Shota; Sasaki, Toshiki; Inoue, Junya

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 62(11), p.658 - 663, 2020/11

no abstracts in English

Journal Articles

An Experimental setup for creating and imaging $$^{4}$$He$$_{2}$$$$^{ast}$$ excimer cluster tracers in superfluid helium-4 via neutron-$$^{3}$$He absorption reaction

Sonnenschein, V.*; Tsuji, Yoshiyuki*; Kokuryu, Shoma*; Kubo, Wataru*; Suzuki, So*; Tomita, Hideki*; Kiyanagi, Yoshiaki*; Iguchi, Tetsuo*; Matsushita, Taku*; Wada, Nobuo*; et al.

Review of Scientific Instruments, 91(3), p.033318_1 - 033318_12, 2020/03

https://doi.org/10.1063/1.5130919
 Times Cited Count：0 Percentile：0(Instruments & Instrumentation)

Journal Articles

Generation of $$^{4}$$He$$_2^{*}$$ clusters via neutron-$$^{3}$$He absorption reaction toward visualization of full velocity field in quantum turbulence

Matsushita, Taku*; Sonnenschein, V.*; Guo, W.*; Hayashida, Hirotoshi*; Hiroi, Kosuke; Hirota, Katsuya*; Iguchi, Tetsuo*; Ito, Daisuke*; Kitaguchi, Masaaki*; Kiyanagi, Yoshiaki*; et al.

Journal of Low Temperature Physics, 196(1-2), p.275 - 282, 2019/07

https://doi.org/10.1007/s10909-018-02112-3
 Times Cited Count：1 Percentile：4.65(Physics, Applied)

Journal Articles

In situ neutron diffraction study on microstructure evolution during thermo-mechanical processing of medium manganese steel

Nakamura, Yoshihiko*; Shibata, Akinobu*; Gong, W.*; Harjo, S.; Kawasaki, Takuro; Ito, Atsushi*; Tsuji, Nobuhiro*

Proceedings of International Conference on Martensitic Transformations: Chicago, p.155 - 158, 2018/04

https://doi.org/10.1007/978-3-319-76968-4_24

Journal Articles

Development of a new continuous dissolution apparatus with a hydrophobic membrane for superheavy element chemistry

Oe, Kazuhiro*; Attallah, M. F.*; Asai, Masato; Goto, Naoya*; Gupta, N. S.*; Haba, Hiromitsu*; Huang, M.*; Kanaya, Jumpei*; Kaneya, Yusuke*; Kasamatsu, Yoshitaka*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 303(2), p.1317 - 1320, 2015/02

https://doi.org/10.1007/s10967-014-3469-3
 Times Cited Count：10 Percentile：64.26(Chemistry, Analytical)

A new technique for continuous dissolution of nuclear reaction products transported by a gas-jet system was developed for superheavy element (SHE) chemistry. In this technique, a hydrophobic membrane is utilized to separate an aqueous phase from the gas phase. With this technique, the dissolution efficiencies of short-lived radionuclides of $$^{91m,93m}$$Mo and $$^{176}$$W were measured. Yields of more than 80% were observed for short-lived radionuclides at aqueous-phase flow rates of 0.1-0.4 mL/s. The gas flow-rate had no influence on the dissolution efficiency within the studied flow range of 1.0-2.0 L/min. These results show that this technique is applicable for on-line chemical studies of SHEs in the liquid phase.

Journal Articles

Measurement of the Md$$^{3+}$$/Md$$^{2+}$$ reduction potential studied with flow electrolytic chromatography

Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Nozomi; Sato, Tetsuya; Kikuchi, Takahiro; Kaneya, Yusuke; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Nagame, Yuichiro; et al.

Inorganic Chemistry, 52(21), p.12311 - 12313, 2013/11

https://doi.org/10.1021/ic401571h
 Times Cited Count：6 Percentile：23.49(Chemistry, Inorganic & Nuclear)

The reduction behavior of mendelevium (Md) was studied using a flow electrolytic chromatography apparatus. By applying appropriate potentials on the chromatography column, the more stable Md$$^{3+}$$ is reduced to Md$$^{2+}$$. The reduction potential of the Md$$^{3+}$$ + e$$^{-}$$ $$rightarrow$$ Md$$^{2+}$$ couple was determined to be -0.16$$pm$$0.05 V vs. a normal hydrogen electrode.

JAEA Reports

Analysis of the radioactivity concentrations in asphalt- or cement-solidified products generated from research facilities

Hoshi, Akiko; Kameo, Yutaka; Katayama, Atsushi; Sakai, Akihiro; Tsuji, Tomoyuki; Nakashima, Mikio; Kihara, Shinji; Takahashi, Kuniaki

JAEA-Data/Code 2009-023, 84 Pages, 2010/03

JAEA-Data-Code-2009-023.pdf:12.81MB

In order to establish the practical evaluation methods such as scaling factor method to determine the radioactivity concentrations of the important nuclides for safety assessment of disposal of radioactive wastes, we analyzed low-level radioactive liquid waste (56 samples), which is generated from various research facilities at Nuclear Science Research Institute from FY1998 to FY2007 and accumulated the radioactivity concentrations data (563 data) of the 17 important nuclides. We investigated the correlation of the radioactivity concentrations of the important nuclides with the "Key nuclides ($$^{60}$$Co or $$^{137}$$Cs)". In present paper, the radioactivity concentrations data of the 17 important nuclides and the results of the correlation of the radioactivity concentrations are summarized for the data to establish the practical evaluation methods to determine the radioactivity concentrations in asphalt-solidified or cement-solidified products.

Journal Articles

Oxidation of element 102, nobelium, with flow electrolytic column chromatography on an atom-at-a-time scale

Toyoshima, Atsushi; Kasamatsu, Yoshitaka*; Tsukada, Kazuaki; Asai, Masato; Kitatsuji, Yoshihiro; Ishii, Yasuo; Tome, Hayato; Nishinaka, Ichiro; Haba, Hiromitsu*; Oe, Kazuhiro*; et al.

Journal of the American Chemical Society, 131(26), p.9180 - 9181, 2009/07

https://doi.org/10.1021/ja9030038
 Times Cited Count：15 Percentile：45.51(Chemistry, Multidisciplinary)

We report here on the successful oxidation of element 102, nobelium (No), on an atom-at-a-time scale in 0.1 M $$alpha$$-hydroxyisobutyric acid ($$alpha$$-HIB) solution using newly developed flow electrolytic column chromatography. It is found that the most stable No$$^{2+}$$ is oxidized to No$$^{3+}$$ within 3 min and that the oxidized No complex with $$alpha$$-HIB holds the trivalent state in the column above the applied potential of 1.0 V.

Journal Articles

Effects of ionizing radiation on locomotory behavior and mechanosensation in ${it Caenorhabditis elegans}$

Suzuki, Michiyo; Sakashita, Tetsuya; Yanase, Sumino*; Kikuchi, Masahiro; Oba, Hirofumi; Higashitani, Atsushi*; Hamada, Nobuyuki*; Funayama, Tomoo; Fukamoto, Kana; Tsuji, Toshio*; et al.

Journal of Radiation Research, 50(2), p.119 - 125, 2009/04

https://doi.org/10.1269/jrr.08087
 Times Cited Count：8 Percentile：29.48(Biology)

Journal Articles

Development of an electrochemistry apparatus for the heaviest elements

Toyoshima, Atsushi; Kasamatsu, Yoshitaka; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Haba, Hiromitsu*; Shinohara, Atsushi*; Nagame, Yuichiro

Radiochimica Acta, 96(6), p.323 - 326, 2008/06

https://doi.org/10.1524/ract.2008.1498
 Times Cited Count：12 Percentile：59.06(Chemistry, Inorganic & Nuclear)

We developed a new apparatus for the study of electrochemical properties of the heaviest elements. The apparatus is based on a flow electrolytic cell combined with column chromatography. Glassy-carbon fibers modified with Nafion perfluorinated cation-exchange resin are used as a working electrode as well as a cation-exchanger. The elution behavior of $$^{139}$$Ce with the number of 10$$^{10}$$ atoms in 0.1 M ammonium $$alpha$$-hydroxyisobutyric acid solution from the column electrode was investigated at the applied potentials of 0.2 - 1.0 V versus the Ag/Agcl reference electrode in 1.0 M LiCl. It was found that $$^{139}$$Ce$$^{3+}$$ is successfully oxidized to $$^{139}$$Ce$$^{4+}$$ even with tracer concentration at around the redox potential determined by cyclic voltammetry for the macro amounts of Ce with 10$$^{17}$$ atoms (10$$^{-3}$$ M). The present oxidation reaction and separation of Ce$$^{4+}$$ was accomplished within a few minutes.

Journal Articles

Atomic stereophotograph of intercalation compound Fe$$_{1/3}$$NbS$$_{2}$$

Guo, F. Z.*; Matsushita, Tomohiro*; Kobayashi, Keisuke*; Matsui, Fumihiko*; Kato, Yukako*; Daimon, Hiroshi*; Koyano, Mikio*; Yamamura, Yasuhisa*; Tsuji, Toshihide*; Saito, Yuji

Journal of Applied Physics, 99(2), p.024907_1 - 024907_3, 2006/01

https://doi.org/10.1063/1.2163995
 Times Cited Count：8 Percentile：31.23(Physics, Applied)

Stereoatomscope was used to study the atomic arrangements of intercalation compound Fe$$_{1/3}$$NbS$$_{2}$$. The three-dimensional atomic arrangements around different kinds of atoms (Nb and Fe) are visualized by taking the photoelectron angular distribution (PEAD) patterns at clockwise and counterclockwise circularly polarized lights. Atomic distances between the emitters and the scatterers are obtained from the PEAD patterns by measuring the rotation angles of the forward focusing peaks. The applications of stereoatomscope to intercalation compound show the possibility to build an ultimate microscope for scientist.

Journal Articles

Photoemission and core-level absorption spectroscopy of Fe$$_{x}$$NbS$$_{2}$$

Saito, Yuji; Kobayashi, Keisuke*; Fujimori, Atsushi; Yamamura, Yasuhisa*; Koyano, Mikio*; Tsuji, Toshihide*; Katayama, Shinichi*

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.829 - 832, 2005/06

https://doi.org/10.1016/j.elspec.2005.01.186
 Times Cited Count：5 Percentile：27.33(Spectroscopy)

no abstracts in English

Journal Articles

Electron acceleration by a nonlinear wakefield generated by ultrashort (23-fs) high-peak-power laser pulses in plasma

Kando, Masaki; Masuda, Shinichi; Zhidkov, A.*; Yamazaki, Atsushi; Kotaki, Hideyuki; Kondo, Shuji; Homma, Takayuki*; Kanazawa, Shuhei; Nakajima, Kazuhisa; Hayashi, Yukio; et al.

Physical Review E, 71(1), p.015403_1 - 015403_4, 2005/01

https://doi.org/10.1103/PhysRevE.71.015403
 Times Cited Count：33 Percentile：77.25(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Investigation of plasma facing components in JT-60U operation

*; Ando, Toshiro; ; Arai, Takashi; Neyatani, Yuzuru; Yoshino, Ryuji; Tsuji, Shunji; Yagyu, Junichi; Kaminaga, Atsushi; ; et al.

Journal of Nuclear Materials, 220-222, p.390 - 394, 1995/00

https://doi.org/10.1016/0022-3115(94)00638-5
 Times Cited Count：16 Percentile：80.76(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Oxidation of nobelium

Toyoshima, Atsushi; Kasamatsu, Yoshitaka; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Ishii, Yasuo; Tome, Hayato; Asai, Masato; Haba, Hiromitsu*; Akiyama, Kazuhiko*; Oe, Kazuhiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Electrochemical oxidation of nobelium

Toyoshima, Atsushi; Kasamatsu, Yoshitaka; Tsukada, Kazuaki; Kitatsuji, Yoshihiro; Haba, Hiromitsu*; Ishii, Yasuo; Tome, Hayato; Asai, Masato; Akiyama, Kazuhiko*; Oe, Kazuhiro*; et al.

no journal, , 

Electrochemical oxidation of nobelium (No) produced in the $$^{248}$$Cm($$^{12}$$C, 5n)$$^{255}$$No reaction was studied using a new electrochemistry apparatus combined with chromatographic separation technique. Chromatographic behaviour of $$^{255}$$No in 0.1 M $$alpha$$-hydroxyisobutyric acid ($$alpha$$-HIB) on the electrode surface was measured with verifying the difference in behaviour between divalent $$^{81}$$Sr$$^{2+}$$ and trivalent $$^{162}$$Yb$$^{3+}$$ ions. Independently of the applied potentials, Yb$$^{3+}$$ was eluted in the 0.1 M $$alpha$$-HIB while Sr$$^{2+}$$ was adsorbed on the electrode. At the low potential of 0.2 V, $$^{255}$$No was adsorbed on the electrode, indicating that No is bound in the most stable divalent state. On the other hand, at the higher potential of 1.2 V, $$^{255}$$No was unambiguously detected in the 0.1 M $$alpha$$-HIB, showing that No exists as a trivalent ion. These results demonstrate that the electrochemical oxidation of No$$^{2+}$$ to No$$^{3+}$$ is successfully performed.

Oral presentation

Characterization of heavy actinides with electrochemistry

Toyoshima, Atsushi; Kasamatsu, Yoshitaka; Tsukada, Kazuaki; Asai, Masato; Kitatsuji, Yoshihiro; Haba, Hiromitsu*; Ishii, Yasuo; Tome, Hayato; Nishinaka, Ichiro; Oe, Kazuhiro*; et al.

no journal, , 

We present a characterization technique for heavy actinides with electrochemistry. An electrochemistry apparatus combined with a chromatographic separation technique was developed to identify oxidation states of the heavy actinides on an atom-at-a-time scale. Oxidation states of nobelium (No) in aqueous solution were studied using the apparatus. Nobelium-255 with a half-life of 3.1 min was produced in the $$^{248}$$Cm($$^{12}$$C, 5n) reaction at the JAEA tandem accelerator. Chromatographic behavior of No on a chemically modified electrode with Nafion perfluoronated ion-exchange resin was investigated in ammonium $$alpha$$-hydroxyisobutyric acid solution. It has been found that No is bound in the most stable divalent state at low applied potentials while it exists as the trivalent ion at higher potentials, showing the electrochemical oxidation of No.

Oral presentation

Electrochemical oxidation of element 102, nobelium

Toyoshima, Atsushi; Kasamatsu, Yoshitaka; Tsukada, Kazuaki; Kitatsuji, Yoshihiro; Haba, Hiromitsu*; Asai, Masato; Ishii, Yasuo; Tome, Hayato; Akiyama, Kazuhiko*; Oe, Kazuhiro*; et al.

no journal, , 

Electrochemical oxidation of element 102, nobelium (No), on an atom-at-a-time scale is presented. We developed a chemically modified electrode with perfluorinated ion-exchange resin to identify oxidation states of No based on chromatographic behavior. Nobelium-255 produced in the $$^{248}$$Cm($$^{12}$$C,5n) reaction at the JAEA tandem accelerator was transported by a He/KCl gas-jet method to a chemical device. Elution behavior of $$^{255}$$No on the electrode in $$alpha$$-hydroxyisobutyric acid was studied as a function of an applied potential. At the low potential of 0.2 V, chemical behavior of $$^{255}$$No was the same as that of Sr$$^{2+}$$, indicating that No is bound in the most stable divalent state. On the other hand, at the higher potential of 1.2 V, elution behavior of $$^{255}$$No was similar to that of Yb$$^{3+}$$, showing that No exists as a trivalent ion. These results demonstrate that the electrochemical oxidation of No$$^{2+}$$ to No$$^{3+}$$ is successfully performed.

Oral presentation

Simulation analysis for organ doses of mouse and human upon neutron exposure by use of voxel phantoms

Satoh, Daiki; Sato, Kaoru; Takahashi, Fumiaki; Endo, Akira; Miyahara, Nobuyuki*; Tsuji, Atsushi*; Omachi, Yasushi*

no journal, , 

The present study intends to calculate the organ doses and analyze the characteristics of the radiation field inside the bodies of a mouse and human. The voxel phantom of mouse had already been developed for an 8-week-old C$$_{3}$$H/HeNs mouse in the previous work. We upgraded this phantom to improve the resolution (voxel size: 0.1$$times$$0.1$$times$$0.1 mm$${^3}$$), and add the nine solid organs. The JM phantom is the voxel phantom of a Japanese adult male developed for the analysis of internal exposure from photons and electrons. We have converted the JM phantom to use in the dose calculation on external neutron exposure, and verified it through the calculation of the absorbed dose per unit neutron fluence at each organ for monoenergetic neutrons. The calculation results showed a good agreement with the reference values reported by ICRP. From the comparison between the organ doses of the mouse and human, it was found that the relativistic dose contribution of electron in the human body is greater than that in the mouse body. This is because the neutrons are moderated inside a large receptor such as the human body, and causes the thermal neutron capture reaction that generates $$gamma$$ ray and consequently electron.

41 (Records 1-20 displayed on this page)