Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Morita, Yasuji; Sasaki, Yuji; Asakura, Toshihide; Kitatsuji, Yoshihiro; Sugo, Yumi; Kimura, Takaumi
IOP Conference Series; Materials Science and Engineering, 9, p.012057_1 - 012057_11, 2010/05
Times Cited Count：7 Percentile：92.11(Chemistry, Inorganic & Nuclear)The authors have developed a new type of extractant for Am and Cm, 
-tetraoctyl-diglycolamide (TODGA), which gives very high distribution ratio at relatively high nitric acid concentration. To apply such a new extractant to the separation process for Am and Cm from HLLW, many criteria should be investigated and satisfied; e.g., separability against fission products (FP), chemical and radiolytic stability, extraction capacity, compatibility with hydrocarbon diluents, and so on. From a viewpoint of extraction capacity, TODGA is modified to -tetradodecyl-diglycolamide (TDdDGA). Since TDdDGA extract Zr and Pd, effective masking agents for them were examined and selected. With those achievements, a counter-current extraction test with 0.1 M TDdDGA in n-dodecane was carried out using a small-scale mixer-settler and simulated solution of HLLW. As results of the test, a very high recovery of Am, more than 99.96%, was obtained and good separation from FP was observed.
-tetradodecyl-diglycolamideSasaki, Yuji; Asakura, Toshihide; Kitatsuji, Yoshihiro; Morita, Yasuji; Kimura, Takaumi
Proceedings of 10th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (CD-ROM), 6 Pages, 2010/00
Diglycolamide, DGA, compounds have the strong extractability with trivalent, tetravalent and hexavalent actinides (An) from nitric acid to n-dodecane. Since DGA connecting with the long alkyl chain, TDdDGA (-tetradodecyl-diglycolamide), has the high extraction capacity and suppresses to form the third phase with Nd, we used TDdDGA to demonstrate the counter-current extraction, prior to the hot test. In this experiment we use four elements, i.e., Sr, Pd, Zr and Nd, as the typical fission products and a representative ion of An(III) and lanthanides, to confirm the extraction and the separation properties, these four elements are extractable by TDdDGA. After determination of the optimum condition on the extraction and separation of Nd from other elements by the calculation using D values, we perform the counter-current extraction using the mixer-settler equipment.
Sasaki, Yuji; Kitatsuji, Yoshihiro; Sugo, Yumi; Asakura, Toshihide; Kimura, Takaumi
Proceedings of International Conference on Advanced Nuclear Fuel Cycles and Systems (Global 2007) (CD-ROM), p.1117 - 1120, 2007/09
An innovative chemical separation process for the treatment of high level radioactive liquid waste (HLW) has been developed in our laboratory. There are two main stages in this process. The diglycolamide (DGA) compounds employed for TRU recovery have several advantages, (1) carbon, hydrogen, oxygen and nitrogen atoms in their structures and gasification by combustion, (2) easy synthesis, (3) neutral and tridentate ligands, and (4) strong extraction ability with An from HNO
). DGA compounds with the different structures can be obtained by attachment of the different alkyl groups to amidic N atoms, i.e., tetraoctyl-diglycolamide (TODGA), tetradodecyl-diglycolamide (TDdDGA), tetrametyl-diglycolamide (TMDGA) and tetraetyl-diglycolamide (TEDGA). The utility of DGA compounds, which shows the different characters, is revealed and the flow-sheet based on the salt-free concept is exhibited in this paper.
NbS
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
Times Cited Count：8 Percentile：31.28(Physics, Applied)Stereoatomscope was used to study the atomic arrangements of intercalation compound FeNbS. 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.
NbSSaito, 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
Times Cited Count：5 Percentile：27.35(Spectroscopy)no abstracts in English
Tsunematsu, Toshihide; Seki, Masahiro; Tsuji, Hiroshi; Okuno, Kiyoshi; Kato, Takashi; Shibanuma, Kiyoshi; Hanada, Masaya; Watanabe, Kazuhiro; Sakamoto, Keishi; Imai, Tsuyoshi; et al.
Fusion Science and Technology, 42(1), p.75 - 93, 2002/07
Times Cited Count：1 Percentile：10.15(Nuclear Science & Technology)Japanese contributions to ITER Engineering Design Activity are presented, together with an introduction of the objectives and design of the ITER whose program have been carried out through the international collaboration by EU, Japan, Russian Federation and the USA. New technologies have been produced through the development, fabrication and testing of scalable models in the fields of superconducting magnet, reactor structure with vacuum vessel, high-heat-flux plasma facing component, neutral beam injector, high-power mm-wave generator and so on. As major contributions from Japan, development and testing results of a 13-T, 640-MJ, NbSn pulsed magnet, a 18-degree sector of vacuum vessel with a height of 15 m and a width of 9 m, CFC armors to CuCrZr cooling tube that withstood 20 MW/m
, a 31 mA/cm negative ion beam source, a 1-MeV beam-accelerator, a 1-MW 170-GHz gyrotron were described.
Yamashita, Toshiyuki; ; Tsuji, Toshihide*; *
Journal of Alloys and Compounds, 271-273, p.404 - 407, 1998/00
Times Cited Count：9 Percentile：55.08(Chemistry, Physical)no abstracts in English
Yamashita, Toshiyuki; *; Tsuji, Toshihide*; Kato, Tetsuya*; *; Iwashita, Mitsushige*
Journal of Alloys and Compounds, 271-273, p.400 - 403, 1998/00
Times Cited Count：4 Percentile：39.22(Chemistry, Physical)no abstracts in English
and some other actinide dioxidesYamashita, Toshiyuki; Shirasu, Noriko; Tsuji, Toshihide*; *
Journal of Nuclear Materials, 245(1), p.72 - 78, 1997/00
Times Cited Count：104 Percentile：98.55(Materials Science, Multidisciplinary)no abstracts in English
Yamashita, Toshiyuki; Shirasu, Noriko; Tsuji, Toshihide*; Kato, Tetsuya*
Journal of Nuclear Materials, 247, p.90 - 93, 1997/00
Times Cited Count：51 Percentile：94.73(Materials Science, Multidisciplinary)no abstracts in English
Yamashita, Toshiyuki; ; Ouchi, Kinji; Muromura, Tadasumi; Tsuji, Toshihide*; *; Kato, Tetsuya*
Journal of Alloys and Compounds, 213-214, p.375 - 377, 1994/00
Times Cited Count：12 Percentile：66.82(Chemistry, Physical)no abstracts in English
Tsuji, Toshihide*; *; Yamashita, Toshiyuki; Fujino, Takeo*
Journal of Alloys and Compounds, 213-214, p.378 - 380, 1994/00
Times Cited Count：1 Percentile：25.3(Chemistry, Physical)no abstracts in English
; Tsuji, Toshihide*; *
Defect Diffus. Forum, 95-98, p.887 - 892, 1993/00
no abstracts in English
-iron telluride(Fe
Te) by Moessbauer spectroscopy and tracer method; Tsuji, Toshihide*; *
Journal of Nuclear Materials, 203, p.172 - 178, 1993/00
Times Cited Count：3 Percentile：38.1(Materials Science, Multidisciplinary)no abstracts in English
-iron telluride(Fe
Te) by Moessbauer spectroscopy; Tsuji, Toshihide*; *
Journal of Nuclear Materials, 203, p.179 - 185, 1993/00
Times Cited Count：3 Percentile：38.1(Materials Science, Multidisciplinary)no abstracts in English
at low oxygen partial pressuresFujino, Takeo*; Yamashita, Toshiyuki; Ouchi, Kinji; *; Tsuji, Toshihide*
Journal of Nuclear Materials, 202, p.154 - 162, 1993/00
Times Cited Count：11 Percentile：72.08(Materials Science, Multidisciplinary)no abstracts in English
; Tsuji, Toshihide*; *
Journal of Nuclear Science and Technology, 29(1), p.68 - 77, 1992/01
no abstracts in English
; Tsuji, Toshihide*; *
Journal of Nuclear Science and Technology, 28(8), p.721 - 731, 1991/08
no abstracts in English
P.E.Potter*; Nakamura, Akio; Tsuji, Toshihide*
Nihon Genshiryoku Gakkai-Shi, 31(3), p.347 - 349, 1989/03
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
Asakura, Toshihide; Imaizumi, Hirobumi; Sasaki, Yuji; Kitatsuji, Yoshihiro; Morita, Yasuji; Kimura, Takaumi
no journal, ,
Total TRU separation technology using diglycolamide as an extraction solvent has been developed to apply it to the MA separation process of the spent FBR fuel reprocessing, etc. Separation tests were performed using Mixer-settlers. 1 M (mol dm
) nitric acid solution containing Nd, Sr, Zr, Pd, HO and EDTA was used as the feed, and 0.1 M tetradodecyl diglycolamide / docecane was used as the extraction solvent. Only Nd was used to represent the trivalent cations such as Am, Cm and rare earthes. As the results, Nd was extracted from the feed and Sr was separated from Nd, highly effectively. Almost all of Zr and Pd were not extracted and transferred to raffinate, 3 % of Zr and 0.4 % of Pd, however, were transferred to the Nd product.
