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Tc separation/concentration technology from 
Mo by (n, 
) methodFujita, Yoshitaka; Hu, X.*; Takeuchi, Tomoaki; Takeda, Ryoma; Fujihara, Yasuyuki*; Yoshinaga, Hisao*; Hori, Junichi*; Suzuki, Tatsuya*; Suematsu, Hisayuki*; Ide, Hiroshi
KURNS Progress Report 2022, P. 110, 2023/07
no abstracts in English
Sun, Haomin; Porcheron, E.*; Magne, S.*; Leroy, M.*; Dhote, J.*; Ruffien Ciszak, A.*; Bentaib, A.*
Proceedings of OECD/NEA Specialist Workshop on Advanced Measurement Method and Instrumentation for enhancing Severe Accident Management in an NPP addressing Emergency, Stabilization and Long-term Recovery Phases (SAMMI 2020) (Internet), 10 Pages, 2020/12
Bentaib, A.*; Janin, T.*; Porcheron, E.*; Magne, S.*; Leroy, M.*; Dhote, J.*; Ruffien Ciszak, A.*; Sun, Haomin
Proceedings of OECD/NEA Specialist Workshop on Advanced Measurement Method and Instrumentation for enhancing Severe Accident Management in an NPP addressing Emergency, Stabilization and Long-term Recovery Phases (SAMMI 2020) (Internet), 6 Pages, 2020/12
-polarization Raman microscopySaito, Yuika*; Tokiwa, Kenshiro*; Kondo, Takahiro*; Bao, J.*; Terasawa, Tomoo; Norimatsu, Wataru*; Kusunoki, Michiko*
AIP Advances (Internet), 9(6), p.065314_1 - 065314_6, 2019/06
Times Cited Count：4 Percentile：21.5(Nanoscience & Nanotechnology)Yomogida, Takumi; Esaka, Fumitaka; Magara, Masaaki
Analytical Methods, 9(44), p.6261 - 6266, 2017/11
Times Cited Count：9 Percentile：55.41(Chemistry, Analytical)A combination of micro-sampling, micro-Raman spectroscopy (MRS), and secondary ion mass spectrometry (SIMS) was applied to the characterization of individual uranium particles. Reference particles with U
O
(NBL CRM U010) and UO
were identified by scanning electron microscopy combined with energy dispersive X-ray detection (SEM-EDX) and transferred onto grassy carbon substrates by micro-sampling. The crystalline phases of the reference particles with diameters ranging from 1 
m to 5 m were determined non-destructively by using MRS thanks to the optimization of laser power at the measurement. Isotope ratios were also determined with SIMS after the MRS analysis and were consistent with values in the literature. These results indicate that chemical forms and isotope ratios of individual uranium particles as small as 1 m can be analyzed efficiently by using the proposed method.
and NpO in highly concentrated chloride solutionsFujii, Toshiyuki*; Uehara, Akihiro*; Kitatsuji, Yoshihiro; Yamana, Hajimu*
Journal of Radioanalytical and Nuclear Chemistry, 303(1), p.1015 - 1020, 2015/01
Times Cited Count：6 Percentile：45.66(Chemistry, Analytical)The 
symmetric vibrational frequency of UO in chloride solutions was studied by Raman spectrometry and ab initio calculations. The frequency experimentally obtained decreased with the increase of concentration of Cl in solvent chlorides. This is attributable to that hydration water molecules in the equatorial plane of UO are substituted by Cl
ions, which was consistent with the calculation results. The theoretical part was expanded to aqua- and chloro- Np(VI) complexes. The frequencies of neptunyl species computed were acceptable compared with the reported Raman shifts.
thin filmsNarumi, Kazumasa; Xu, Y.; Miyashita, Kiyoshi*; Naramoto, Hiroshi
European Physical Journal D, 24(1-3), p.385 - 388, 2003/06
Times Cited Count：4 Percentile：22.96(Optics)The structural changes have been investigated in C thin films irradiated with 7-MeV 
C ions using Raman spectroscopy. First, irradiated C thin films show resistance to photopolymerization. The extent of the resistance increases with increasing fluence of ion irradiation. The effect is qualitatively explained by the fact that the photochemical reaction is suppressed by destructive collisions of the C molecules with the energetic ions followed by lattice damage. Secondly, no intermediate fragments of a C molecule generated by ion impact are observed, 
, each C molecule completely decomposes into its constituent atoms in a single catastrophic event upon energetic-ion impact. An effective cross section for decomposition of the C molecule is derived from dependence of the peak-intensity ratio of 
(2) as 
= 5.1
10
cm
.
Iwai, Yasunori; Yamanishi, Toshihiko; Ohira, Shigeru; Suzuki, Takumi; Shu, Wataru; Nishi, Masataka
Fusion Engineering and Design, 61-62, p.553 - 560, 2002/11
Times Cited Count：15 Percentile：65.5(Nuclear Science & Technology)no abstracts in English
Ohira, Shigeru; Hayashi, Takumi; Nakamura, Hirofumi; Kobayashi, Kazuhiro; Tadokoro, Takahiro*; Nakamura, H.*; Ito, Takeshi*; Yamanishi, Toshihiko; Kawamura, Yoshinori; Iwai, Yasunori; et al.
Nuclear Fusion, 40(3Y), p.519 - 525, 2000/03
Times Cited Count：24 Percentile：58.99(Physics, Fluids & Plasmas)no abstracts in English
Ohira, Shigeru; Hayashi, Takumi; Nakamura, Hirofumi; Kobayashi, Kazuhiro; Tadokoro, Takahiro*; Nakamura, H.*; Ito, Takeshi*; Yamanishi, Toshihiko; Kawamura, Yoshinori; Iwai, Yasunori; et al.
Fusion Energy 1998, 3, p.1069 - 1072, 1998/10
no abstracts in English
-CO systemOhira, Shigeru; Nakamura, Hirofumi; Okuno, Kenji; Taylor, D. J.*; Sherman, R. H.*
Fusion Technology, 28(3), p.1239 - 1243, 1995/10
no abstracts in English
Noda, Kenji; ; Ishii, Yoshinobu; Fukai, Katsumaro; *; D.Vollath*; *
Mater. Trans. JIM, 34(11), p.1150 - 1154, 1993/11
Times Cited Count：12 Percentile：69.33(Materials Science, Multidisciplinary)no abstracts in English
Hayashi, Takumi; Nakamura, Hirofumi; Konishi, Satoshi; Yamanishi, Toshihiko; Inoue, Masahiko*; Hirata, Kazuhiro*; Okuno, Kenji; Naruse, Yuji; Anderson, J. L.*; Barnes, J. W.*; et al.
JAERI-M 93-081, 35 Pages, 1993/03
no abstracts in English
glassesOno, Hideo; Nagasaki, Takanori; Igawa, Naoki; Kawamura, Hiroshi
Journal of Nuclear Materials, 179-181, p.473 - 476, 1991/00
Times Cited Count：8 Percentile：66.02(Materials Science, Multidisciplinary)no abstracts in English
; Ogawa, Toru; Fukuda, Kosaku
Journal of Nuclear Materials, 175, p.266 - 269, 1990/00
Times Cited Count：15 Percentile：88.65(Materials Science, Multidisciplinary)no abstracts in English
Yomogida, Takumi; Esaka, Fumitaka; Magara, Masaaki
no journal, ,
Chemical forms of particles in environmental samples give important information on the history of particles. In particular, we can detect the nuclear activities such as refining, conversion and enrichment process by determination of the chemical form of uranium particles. In this study, we developed a micro-Raman spectroscopy technique combined with particle detection by scanning electron microscope (SEM) and micro manipulation to identify chemical forms of standard uranium particles. The characteristic Raman bands which derive from UO structures were observed in the Raman spectra of a standard uranium particle with a diameter of 2 m.
Yomogida, Takumi; Esaka, Fumitaka; Magara, Masaaki
no journal, ,
In this study, we developed a micro-Raman spectroscopy technique combined with alpha track-detection to identify chemical forms of uranium particles. UO and UO particles were used as samples. Films containing uranium-bearing particles were exposed to alpha track detectors (TNF-1) for a few months. The location of uranium particles in the films were identified by observing alpha tracks which caused by spontaneous fission of uranium. The characteristic Raman bands which derive from UO and UO structures were observed in the Raman spectra of uranium particles.
Watanabe, Masashi; Kato, Masato; Sunaoshi, Takeo*; Yato, Tadao*; Konashi, Kenji*
no journal, ,
Raman spectroscopy has been used to detect the oxygen vacancies and proven to be a very powerful characterization technique. Recently, Raman spectra were measured for UO
, but the Raman spectral data of hypo-stoichiometric actinide oxides are limited. The present work demonstrated that the Raman microscopy could successfully be used to detect the Raman spectra of non-stoichiometric (U, Ce)O.
Yomogida, Takumi; Esaka, Fumitaka; Magara, Masaaki
no journal, ,
Analysis of individual uranium particles in environmental samples from nuclear facilities is useful for detecting nuclear activity. Uranium isotope ratios in the samples are measured to detect nuclear activities related to production of nuclear weapons. We can detect the nuclear activities such as refining, conversion and enrichment process by determination of the chemical form of uranium particles. In this study, we developed a secondary ion mass spectrometry combined with micro-Raman spectroscopy for isotopic and chemical analysis of individual uranium particles. The developed methods have been applied to the analysis of reference uranium materials. As a result, the isotope ratios and the chemical form of individual uranium particle can be analyzed with the proposed method.
Yomogida, Takumi; Esaka, Fumitaka; Magara, Masaaki
no journal, ,
Recently, we are applying micro-Raman spectroscopy to the identification of the chemical forms of individual uranium particles for nuclear safeguards. In this study, a micro-Raman spectroscopy technique combined with particle detection by scanning electron microscope and micro manipulation was developed to identify chemical forms of uranium particles. The characteristic Raman bands at 445 and 1160 cm
assigned to UO structures were observed in the Raman spectrum of a uranium particle with a diameter of 1 m. The particle shape was preserved after the Raman measurement, which indicated the particle was not burned by the laser beam. In conclusion, the chemical forms of individual uranium particles with micro-meter size can be analyzed with the proposed method without damaging the particles.
