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Journal Articles

Numerical analysis for FP speciation in VERDON-2 experiment; Chemical re-vaporization of iodine in air ingress condition

Shiotsu, Hiroyuki; Ito, Hiroto*; Sugiyama, Tomoyuki; Maruyama, Yu

Annals of Nuclear Energy, 163, p.108587_1 - 108587_9, 2021/12

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

JAEA Reports

JAEA-TDB-RN in 2020; Update of JAEA's thermodynamic database for solubility and speciation of radionuclides for performance assessment of geological disposal of high-level and TRU wastes

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 ($$Delta_{rm f}$$$$G^{circ}_{rm m}$$), change in standard enthalpy change of formation ($$Delta$$$$H$$$$^{circ}$$$$_{rm m}$$), standard molar entropy ($$S^{circ}$$$$_{rm m}$$) and, heat capacity ($$C^{circ}_{rm p}$$), change in standard Gibbs free energy of reaction ($$Delta_{rm r}G^{circ}$$$$_{rm m}$$), change in standard enthalpy change of reaction ($$Delta$$$$_{rm r}$$$$H$$$$^{circ}$$$$_{rm m}$$) and standard entropy change of reaction ($$Delta_{rm r}S^{circ}_{rm m}$$) as well as logarithm of equilibrium constant (log$$_{10}$$$$K^{circ}$$) 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$$_{10}$$$$K^{circ}$$ 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.

Journal Articles

Role of the hydroxo group in the coordination of citric acid to trivalent americium

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:0 Percentile:0.01(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$$_{3}$$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).

Journal Articles

Development of thermodynamic database for performance assessment of geological disposal of high-level radioactive waste and TRU waste

Kitamura, Akira

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 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.

Journal Articles

Preliminary evaluation of local structure and speciation of lanthanoids in aqueous solution, iron hydroxide, manganese dioxide, and calcite using the L$$_{3}$$-Edge X-ray absorption near edge structure spectra

Ota, Atsuyuki*; Tanaka, Kazuya; Tsuno, Hiroshi*

Journal of Physical Chemistry A, 122(41), p.8152 - 8161, 2018/10

 Times Cited Count:1 Percentile:5.88(Chemistry, Physical)

We investigated the application of L$$_{3}$$-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$$_{2}$$O$$^{0}$$, -O$$^{-}$$, -OH$$^{-}$$, -CO$$_{3}$$$$^{2-}$$, -Cl$$^{-}$$, and -O$$^{2-}$$) that cause the crystal field splitting. Therefore, the FWHM values of L$$_{3}$$-edge XANES of lanthanoid compounds may be more useful in speciation analysis rather than structural analysis such as EXAFS.

Journal Articles

Time-dependent chemical compositions of $$^{13}$$N and $$^{15}$$O induced in air by the operation of a high energy electron accelerator

Endo, Akira; J.Henshaw*; M.A.Mignanelli*

Health Physics, 74(4), p.456 - 464, 1998/04

 Times Cited Count:2 Percentile:25.2(Environmental Sciences)

no abstracts in English

Journal Articles

Solid-aqueous phase equilibria of uranium(VI) under ambient conditions

G.Meinrath*; ; Kimura, Takaumi; Yoshida, Zenko

Radiochimica Acta, 75(3), p.159 - 167, 1996/00

no abstracts in English

JAEA Reports

The Aqueous solubility and speciation analysis for uranium, neptunium and selenium by the geochemical code (EQ3/6)

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

JAEA Reports

Study on the photoacoustic spectroscopy capabilities with remote detection for monitoring of actinide species in nuclear fuel reprocessing solutions

S.I.Sinkov*; Kihara, Takehiro; Fujine, Sachio; Maeda, Mitsuru

JAERI-Tech 95-016, 48 Pages, 1995/03

JAERI-Tech-95-016.pdf:1.7MB

no abstracts in English

Journal Articles

Speciation of uranium in aqueous solutions and in precipitates by photoacoustic spectroscopy

Kimura, Takaumi; J.G.Serrano*; ; *; Takeishi, Hideyo

Radiochimica Acta, 58-59, p.173 - 178, 1992/00

no abstracts in English

Journal Articles

Application of laser induced photoacoustic spectroscopy system to the determination of transuranic elements

Kihara, Takehiro; Fujine, Sachio; *; *; Maeda, Mitsuru; *

Solvent Extraction 1990, Part A, p.497 - 502, 1992/00

no abstracts in English

Journal Articles

Applications of photoacoustic spectroscopy to speciation of lanthanide elements in aqueous solutions and of solid phase

; Kimura, Takaumi

Journal of Nuclear Science and Technology, 28(8), p.780 - 783, 1991/08

no abstracts in English

Journal Articles

Development of photoacoustic spectroscopy for speciation of actinide elements in aqueous solution and in solid phase

Kimura, Takaumi;

3rd Int. Symp. on Advanced Nuclear Energy Research; Global Environment and Nuclear Energy, 6 Pages, 1991/00

no abstracts in English

Journal Articles

Long-lived radionuclide transport; An In-situ field column study

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

Journal Articles

Chemical behavior of neptunium in groundwater

Nihon Genshiryoku Gakkai-Shi, 32(10), p.970 - 974, 1990/10

 Times Cited Count:6 Percentile:58.26(Nuclear Science & Technology)

no abstracts in English

15 (Records 1-15 displayed on this page)
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