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Shiotsu, Hiroyuki; Ito, Hiroto*; Sugiyama, Tomoyuki; Maruyama, Yu
Annals of Nuclear Energy, 163, p.108587_1 - 108587_9, 2021/12
Times Cited Count：1 Percentile：12.48(Nuclear Science & Technology)
I in the terrestrial environment after the Fukushima Dai-ichi Nuclear Power Plant accidentHonda, Maki
Chikyu Kagaku, 55(4), p.176 - 192, 2021/12
Iodine 129 (I) is a radionuclide that decays to Xe with a half-life of 15.7 million years. The analysis of I in the environment has played an important role not only in the fields of planetary science and earth science, but also in the nuclear field in recent years. Particularly, in the case of the Fukushima Dai-ichi Nuclear Power Plant accident in March, 2011, the scientists estimated the distribution and soil deposition of 
I over a wide area, and contributed to the assessment of internal exposure doses in the early stage of the accident. This is one of the most significant achievements in recent I-related studies. Future studies are expected to be conducted to elucidate the transport mechanism of I from land to river and sea, and to investigate the possible accumulation of I in aquatic organisms. The mobility of I in the soil studied by the author during the 10-years since the accident has been mainly reviewed in this manuscript.
Kitamura, Akira
JAEA-Data/Code 2020-020, 164 Pages, 2021/03
JAEA-Data-Code-2020-020.pdf:3.11MB
JAEA-Data-Code-2020-020-appendix(DVD-ROM).zip:0.56MB
Part of JAEA's Thermodynamic Database (JAEA-TDB) for solubility and speciation of radionuclides (JAEA-TDB-RN) for performance assessment of geological disposal of high-level radioactive and TRU wastes has been updated with subsuming the database for geochemical calculations (JAEA-TDB-GC). This report has focused to update JAEA-TDB-RN after selecting change in standard Gibbs free energy of formation (
), change in standard enthalpy change of formation (
), standard molar entropy (
) and, heat capacity (
), change in standard Gibbs free energy of reaction (
), change in standard enthalpy change of reaction (
) and standard entropy change of reaction (
) as well as logarithm of equilibrium constant (log
) at standard state. The extent of selection of these thermodynamic data enables to evaluate solubility and speciation of radionuclides at temperatures other than 298.15 K. Furthermore, the latest thermodynamic data for iron which have been critically reviewed, selected and compiled by the Nuclear Energy Agency within Organisation for Economic Co-operation and Development (OECD/NEA) have been accepted. Most of previously selected log have been refined to confirm internal consistency with JAEA-TDB-GC. Text files of the updated JAEA-TDB have been provided for geochemical calculation programs of PHREEQC and Geochemist's Workbench.
Tamain, C.*; Bonato, L.*; Aupiais, J.*; Dumas, T.*; Guillaumont, D.*; Barkleit, A.*; Berthon, C.*; Solari, P. L.*; Ikeda, Atsushi; Guilbard, P.*; et al.
European Journal of Inorganic Chemistry, 2020(14), p.1331 - 1344, 2020/04
Times Cited Count：4 Percentile：27.33(Chemistry, Inorganic & Nuclear)The molecular characterization based on multi-technique approach has led to major highlights on revealing the coordination environment of americium (Am) surrounded by citric acid (H
CitH). The structure of the different complexes at pH 1 and 3 are described. These characterizations are made possible by the comparison of the americium-citric acid system with the americium-tricarballylic acid (one analogue of the citric acid without the alpha-hydroxo group).
Kitamura, Akira
Nihon Genshiryoku Gakkai-Shi ATOMO
, 62(1), p.23 - 28, 2020/01
Thermodynamic databases (TDBs) for performance assessment of geological disposal of high-level waste and TRU waste have been developed to predict solubility and speciation of radionuclides in groundwater in some countries including Japan. The present manuscript briefly describes current status of development of the TDB organized by the Nuclear Energy Agency within the Organisation of Economic Co-operation and Development (OECD/NEA) and the TDBs in some countries including Japan.
-Edge X-ray absorption near edge structure spectraOta, Atsuyuki*; Tanaka, Kazuya; Tsuno, Hiroshi*
Journal of Physical Chemistry A, 122(41), p.8152 - 8161, 2018/10
Times Cited Count：1 Percentile：3.03(Chemistry, Physical)We investigated the application of L-edge XANES spectra to the local structural analysis of lanthanoids in aqueous solution, iron hydroxide, manganese dioxide, and calcium carbonate. For each lanthanoid, the full width at half maximum (FWHM) values of lanthanoid compounds roughly decreased with increasing coordination numbers. However, they did not strictly reflect the local coordination sphere of the lanthanoid complex, but were rather sensitive to their chemical forms. The relationship between the magnitude of the FWHM values was determined by the crystal field splitting or degeneracy of 5d orbitals. The systematic variation of FWHM can be explained by the ligand strength of the ligand molecules (-H
O
, -O
, -OH, -CO
, -Cl, and -O) that cause the crystal field splitting. Therefore, the FWHM values of L-edge XANES of lanthanoid compounds may be more useful in speciation analysis rather than structural analysis such as EXAFS.
N and 
O induced in air by the operation of a high energy electron acceleratorEndo, Akira; J.Henshaw*; M.A.Mignanelli*
Health Physics, 74(4), p.456 - 464, 1998/04
Times Cited Count：2 Percentile：24.33(Environmental Sciences)no abstracts in English
G.Meinrath*; ; Kimura, Takaumi; Yoshida, Zenko
Radiochimica Acta, 75(3), p.159 - 167, 1996/00
no abstracts in English
Takeda, Seiji; ; Kimura, Hideo; Matsuzuru, Hideo
JAERI-Research 95-069, 47 Pages, 1995/11
JAERI-Research-95-069.pdf:1.65MB
no abstracts in English
S.I.Sinkov*; Kihara, Takehiro; Fujine, Sachio; Maeda, Mitsuru
JAERI-Tech 95-016, 48 Pages, 1995/03
no abstracts in English
Kimura, Takaumi; J.G.Serrano*; ; ; Takeishi, Hideyo
Radiochimica Acta, 58-59, p.173 - 178, 1992/00
no abstracts in English
Kihara, Takehiro; Fujine, Sachio; ; ; Maeda, Mitsuru;
Solvent Extraction 1990, Part A, p.497 - 502, 1992/00
no abstracts in English
; Kimura, Takaumi
Journal of Nuclear Science and Technology, 28(8), p.780 - 783, 1991/08
no abstracts in English
Kimura, Takaumi;
3rd Int. Symp. on Advanced Nuclear Energy Research; Global Environment and Nuclear Energy, 6 Pages, 1991/00
no abstracts in English
D.R.Champ*; J.O.Jirovec*; J.L.Young*; Kumata, Masahiro
Transport and Mass Exchange Processes in Sand and Gravel Aquifers; Field and Modelling Studies,Vol. 2, p.725 - 736, 1991/00
no abstracts in English
Nihon Genshiryoku Gakkai-Shi, 32(10), p.970 - 974, 1990/10
Times Cited Count：6 Percentile：57.11(Nuclear Science & Technology)no abstracts in English
