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Nagai, Takayuki; Okamoto, Yoshihiro; Shiwaku, Hideaki; Inose, Takehiko*; Sato, Seiichi*; Hatakeyama, Kiyoshi*; Hirono, Kazuya*; Homma, Masanobu*; Kobayashi, Hiromi*; Takahashi, Tomoe*; et al.
JAEA-Research 2018-007, 87 Pages, 2018/11
JAEA-Research-2018-007.pdf:61.21MB
To select the chemical composition of a glass frit which can increase the waste content, the simulated waste glass samples prepared from a borosilicate glass frit including vanadium (V) were investigated by using Laser Ablation (LA) ICP-AES analysis, Raman spectrometry, and synchrotron XAFS measurement in this study on foundation business of the Agency for Natural Resources and Energy.
Nagai, Takayuki; Akiyama, Daisuke*; Sato, Nobuaki*
Busshitsu, Debaisu Ryoiki Kyodo Kenkyu Kyoten Kenkyu Seika Hokokusho (Heisei-29-Nendo) (CD-ROM), 1 Pages, 2018/04
no abstracts in English
, and NaCO solutionsUehara, Akihiro*; Fujii, Toshiyuki*; Yamana, Hajimu*; Okamoto, Yoshihiro
Radiochimica Acta, 104(1), p.1 - 9, 2016/01
Times Cited Count：7 Percentile：54.81(Chemistry, Inorganic & Nuclear)The spectroelectrochemical cell was fabricated for in-situ X-ray absorption fine structure (XAFS) measurement. The XAFS spectra of U L-edge were monitored in electrolyte solutions during the electrochemical reduction. Tetravalent uranium was electrochemically prepared from hexavalent uranium and the extended X-ray absorption fine structure (EXAFS) was analyzed. The U
formed in 0.1M HNO was partially re-oxidized to UO
by NO
in the solution. The UO
carbonates were prepared during electrolysis.
Nagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Uehara, Akihiro*; Fujii, Toshiyuki*
Photon Factory Activity Report 2015, Part B, 2 Pages, 2016/00
To investigate the characterization damage of a borosilicate glass by a neutron irradiation, the glass sample after neutron irradiation was estimated by using the Raman spectrophotometry and the synchrotron XAFS measurement. As a result, we confirmed that the Si-O bridge structure of a borosilicate glass and the containing element valence in the glass were changed by the neutron irradiation.
Nagai, Takayuki; Nishizawa, Daiji*; Watanabe, So; Okamoto, Yoshihiro; Seki, Katsumi*; Homma, Masanobu*; Ayame, Yasuo
no journal, ,
no abstracts in English
Nagai, Takayuki; Kobayashi, Hidekazu; Hatakeyama, Kiyoshi*; Sato, Seiichi*; Okamoto, Yoshihiro
no journal, ,
no abstracts in English
generation by reaction with Ru-La-Na mix nitrates and raw materials for vitrificationNagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Sato, Nobuaki*; Inose, Takehiko*; Sato, Seiichi*; Hatakeyama, Kiyoshi*; Seki, Katsumi*
no journal, ,
It is thought that a generated ruthenium compound grows from a high level radioactive liquid waste into RuO crystal by reacting to raw materials for the vitrification process. In this study, the generation reaction to RuO was confirmed by heating Ru-La-Na mix nitrates and the raw materials.
Nagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Seki, Katsumi*; Kobayashi, Hiromi*; Homma, Masanobu*; Hatakeyama, Kiyoshi*
no journal, ,
It is expected by bubbling operation of molten glass that glass composition becomes uniform. Air or Ar gas was purged into the molten simulated waste glass, and the drained glass was investigated by Raman spectrophotometry and synchrotron XAFS measurement. As a result, the Si-O bridging structure with a small number of non-bridging oxygen increases by Ar gas purging into the molten glass and also valence of Ce included in the simulated waste glass reduces.
Nagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Uehara, Akihiro*; Fujii, Toshiyuki*
no journal, ,
To investigate the characterization damage of a borosilicate glass by a neutron irradiation, the glass sample after neutron irradiation was estimated by using the Raman spectrophotometry and the synchrotron XAFS measurement. As a result, we confirmed that the Si-O bridge structure of a borosilicate glass and the valence of containing cerium in the glass were changed by the neutron irradiation.
Okamoto, Yoshihiro; Shiwaku, Hideaki; Nagai, Takayuki; Kobayashi, Hidekazu; Sasage, Kenichi; Hatakeyama, Kiyoshi*
no journal, ,
The local structure and chemical state of fission product elements in the iron phosphate glass containing simulated high-level liquid waste were investigated by using synchrotron radiation based XAFS technique. According to the XAFS analyses, changes of the local structure around zirconium, molybdenum and ruthenium elements in the simulated glass evaluated by varying chemical composition of frit glass and content of the simulated liquid waste. It is assumed from the EXAFS result that ruthenium element was partially dissolved in the glass phase.
meltNagai, Takayuki; Okamoto, Yoshihiro; Inose, Takehiko*; Akiyama, Daisuke*; Sato, Nobuaki*
no journal, ,
A supplied high level liquid waste into the glass melter is formed to the mixed nitrate salt after the dehydration. In this study, NaNO which is a main ingredient in the waste was selected by the solvent, and NaNO sample including Ru was prepared, and the redox behavior of Ru in NaNO melt was measured by the Cyclic Voltammetry. And valence of Ru included in solidified salt was estimated by the synchrotron XAFS measurement.
) solution-NaNO-Glass frit by XAFS measurementNagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Akiyama, Daisuke*; Sato, Nobuaki*
no journal, ,
no abstracts in English
Nagai, Takayuki; Okamoto, Yoshihiro; Akiyama, Daisuke*; Sato, Nobuaki*
no journal, ,
no abstracts in English
