JOPSS - Search Results

Journal Articles

Unusually kinetically inert monocationic neptunyl complex with a fluorescein-modified 1,10-phenanthroline-2,9-dicarboxylate ligand; Specific separation and detection in gel electrophoresis

Yamagata, Kazuhito*; Ouchi, Kazuki; Marumo, Kazuki*; Tasaki-Handa, Yuiko*; Haraga, Tomoko; Saito, Shingo*

Inorganic Chemistry, 62(2), p.730 - 738, 2023/01

https://doi.org/10.1021/acs.inorgchem.2c02908

Times Cited Count：2 Percentile：78.4(Chemistry, Inorganic & Nuclear)

The inert NpO $_{2}$ $^{+}$ complex with a fluorescein-modified phenanthroline-2,9-dicarboxylic acid was found by kinetic selection using polyacrylamide gel electrophoresis (PAGE) from a small chemical library. The small spontaneous dissociation rate constant of 810 $^{-6}$ s $^{-1}$ (the half-life of 23 hours) was determined. This is the singly-charged NpO $_{2}$ $^{+}$ complex exhibiting unusual kinetic inertness in aqueous solution, one million times slower than widely accepted fast kinetics of neptunyl complexes. Selective fluorescence detection of NpO $_{2}$ $^{+}$ was achieved in PAGE with a detection limit of 68 pmol dm $^{-3}$ (17 fg). This system was successfully applied to simulated spent nuclear fuel and high-level radioactive waste samples.

Journal Articles

Safe and rapid development of capillary electrophoresis for ultratrace uranyl ions in radioactive samples by way of fluorescent probe selection for actinide ions from a chemical library

Haraga, Tomoko; Ouchi, Kazuki; Sato, Yoshiyuki; Hoshino, Hitoshi*; Tanana, Rei*; Fujihara, Takashi*; Kurokawa, Hideki*; Shibukawa, Masami*; Ishimori, Kenichiro; Kameo, Yutaka; et al.

Analytica Chimica Acta, 1032, p.188 - 196, 2018/11

https://doi.org/10.1016/j.aca.2018.05.077

Times Cited Count：12 Percentile：45.99(Chemistry, Analytical)

The development of safe, rapid and highly sensitive analytical methods for radioactive samples, especially actinide (An) ions, represents an important challenge. Here we propose a methodology for selecting appropriate emissive probes for An ions with very low consumption and emission of radioactivity by capillary electrophoresis-laser-induced fluorescence detection (CE-LIF), using a small chemical library of probes with eight different chelating moieties. It was found that the emissive probe, which possesses the tetradentate chelating moiety, was suitable for detecting uranyl ions. The detection limit for the uranyl-probe complex using CE-LIF combined with dynamic ternary complexation and on-capillary concentration techniques was determined to be 0.7 ppt. This method was successfully applied to real radioactive liquid samples collected from nuclear facilities.

Journal Articles

Beam commissioning of the linac for iBNCT

Naito, Fujio*; Anami, Shozo*; Ikegami, Kiyoshi*; Uota, Masahiko*; Ouchi, Toshikatsu*; Onishi, Takahiro*; Oba, Toshiyuki*; Obina, Takashi*; Kawamura, Masato*; Kumada, Hiroaki*; et al.

Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1244 - 1246, 2016/11

http://www.pasj.jp/web_publish/pasj2016/proceedings/PDF/TUP1/TUP118.pdf

The proton linac installed in the Ibaraki Neutron Medical Research Center is used for production of the intense neutron flux for the Boron Neutron Capture Therapy (BNCT). The linac consists of the 3-MeV RFQ and the 8-MeV DTL. Design average beam current is 10mA. Target is made of Beryllium. First neutron production from the Beryllium target was observed at the end of 2015 with the low intensity beam as a demonstration. After the observation of neutron production, a lot of improvement s was carried out in order to increase the proton beam intensity for the real beam commissioning. The beam commissioning has been started on May 2016. The status of the commissioning is summarized in this report.

Journal Articles

Oxidation-Reduction Equilibrium of Fe3+/Fe2 in a Candidate Glass for Immobilization of High Level Nuclear Waste

Kawamura, Kazuhiro; Miyamoto, Yoichi; Ouchi, Jin

Glass Technology, 39(4), p.142 - 148, 2002/00

None

JAEA Reports

None

Ouchi, Jin; Nogami, Yoshitaka; Tobita, Noriyuki;

JNC TN8420 99-002, 52 Pages, 1999/01

JNC-TN8420-99-002.pdf:4.87MB

None

Journal Articles

None

Ouchi, Jin

Gekkan "Enerugi", 32(1), p.99 - 101, 1999/01

None

Journal Articles

Oxidation-reduction equilibrium of Fe $^{3+}$ /Fe $^{2+}$ in a candidate glass for immobilisation of high level nuclear waste

Iwase, Masanori*; Kawamura, Kazuhiro; Miyamoto, Yoichi; Ouchi, Jin

Glass Technology, 39(4), p.142 - 146, 1998/08

None

JAEA Reports

After-service inspection of HENDEL in-core structure test section T $_{2}$ ; 1, Inspection results at dismantlement

Fujisaki, Katsuo; Inagaki, Yoshiyuki; ; ; ; ; Sekita, Kenji; Morisaki, Norihiro; *; Iwatsuki, Jin*; et al.

JAERI-Tech 97-053, 57 Pages, 1997/10

JAERI-Tech-97-053.pdf:3.26MB

no abstracts in English

JAEA Reports

Measurement of glass transition temperature of waste glass by differential thermal analysis (DTA); Research report on solidification of high-level liquid waste

Ouchi, Jin; ; Kawamura, Kazuhiro; *; ; Sasage, Kenichi; Odakura, Makoto

PNC TN8410 97-044, 53 Pages, 1997/03

PNC-TN8410-97-044.pdf:1.36MB

The glass transition temperature of simulated waste glass was measured by DTA installed in CPF (Chemical Processing Facility) and HTS (High Level Waste Technology Section). This measurement was intended to confirm the agreement between hot and cold data as a part of characterization of high level waste glass. Glass transition temperature is an index of the temperature to keep thermal stability of high-level waste glass. Since devitrification deteriorates characteristics of waste glass above glass transition temperature, it is necessary to measure glass transition temperature and keep glass temperature below glass transition temperature. The conventional method to determine glass transition temperature is the measurement of thermal expansion, but DTA is adopted for radioactive sample because of easier preparation. We obtained following results by measuring glass transition temperature of simulated waste glasses after calibration with standard specimen : (1)The average glass transition temperature of TVF waste glass (P0798) measured by DTA in HTS and CPF was 494 $^{circ}$ C (standard deviation 3 : 8.2 $^{circ}$ C) and 495 $^{circ}$ C (3: 1.8 $^{circ}$ C), respectively. The difference between two analyzer was 1 $^{circ}$ C. It shows the good agreement between hot and cold DTA data. (2)Glass transition temperature of P0798 measured by thermal expansion method was 495 $^{circ}$ C(3: 8.1 $^{circ}$ C) and it agrees well with that measured by DTA. (3)The average glass transition temperature of simulated highly waste-loading glass (P1102) measured by DTA in HTS and CPF was 510.5 2.5 $^{circ}$ C.