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JAEA Reports

Decommissioning report for Wastewater Treatment Facility (Part 2); Chapter on contamination inspection section

Yamamoto, Keisuke; Nakagawa, Takuya; Shimojo, Hiroto; Kijima, Jun; Miura, Daiya; Onose, Yoshihiko*; Namba, Koji*; Uchida, Hiroaki*; Sakamoto, Kazuhiko*; Ono, Chika*; et al.

JAEA-Technology 2024-019, 211 Pages, 2025/02

JAEA-Technology-2024-019.pdf:35.35MB

The uranium enrichment facilities at the Nuclear Fuel Cycle Engineering Laboratories of Japan Atomic Energy Agency (JAEA) were constructed sequentially to develop uranium enrichment technology with centrifugal separation method. The developed technologies were transferred to Japan Nuclear Fuel Limited until 2001. And the original purpose has been achieved. Wastewater Treatment Facility, one of the uranium enrichment facilities, was constructed in 1976 to treat radioactive liquid waste generated at the facilities, and it finished the role in 2008. In accordance with the Medium/Long-Term Management Plan of JAEA Facilities, interior equipment installed in this facility had been dismantled and removed since November 2021 to August 2023. This report summarizes the findings obtained through the work related to the contamination inspection methods cancellation the controlled area of Wastewater Treatment Facility from September 2023 to March 2024.

Journal Articles

Development of a large-area alpha imaging detector for hand and foot monitors

Morishita, Yuki; Higuchi, Mikio*; Kaneko, Junichi*; Kitagawa, Yuichi*; Akedo, Jun*; Soma, Mitsugu*; Matsui, Hiroaki*

Nuclear Instruments and Methods in Physics Research A, 1057, p.168702_1 - 168702_8, 2023/12

https://doi.org/10.1016/j.nima.2023.168702

Times Cited Count：2 Percentile：15.49(Instruments & Instrumentation)

This paper describes the development of a large-area imaging detector capable of measuring the detailed distribution of alpha particles on hands and feet for use in entry/exit control monitors in decommissioning sites such as the Fukushima Daiichi Nuclear Power Plant. The detector was developed using a commercially available ZnS(Ag) scintillator and an electron multiplying CCD camera. The effectiveness of the detector was evaluated by measuring several types of radiation sources, and the results showed that it was possible to detect the position of alpha particles in a very short time, and contamination levels of up to 11 Bq/cm $^{2}$ could be visualized. As a result of the minimal detectable surface activity concentration evaluations, 2.0 minutes or more is required to achieve 4 Bq/cm $^{2}$ , and 25.0 minutes or more is required to achieve 0.4 Bq/cm $^{2}$ . The field of view of the detector was also checked, and it was confirmed that the setup had a field of view that could cover most of the hand and the sole of the shoe. This detector is expected to be useful for preventing internal uptake and decontamination.

Journal Articles

Phase relations and crystal chemistry in the ternary UO $_{2}$ -PrO $_{1}$ $_{.}$ $_{5}$ -O $_{2}$ system

; Fujino, Takeo; Tagawa, Hiroaki

J. Nucl. Mater., 132, p.192 - 201, 1985/00

https://doi.org/10.1016/0022-3115(85)90414-3

Times Cited Count：21 Percentile：88.94(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Oxidation-reduction properties of mixed oxides in the cerium-uranium-oxygen system

Tagawa, Hiroaki; Fujino, Takeo; ; ;

Bulletin of the Chemical Society of Japan, 54(1), p.138 - 142, 1981/00

https://doi.org/10.1246/bcsj.54.138

Times Cited Count：17 Percentile：71.68(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Electrical conductivity anomaly in near-stoichiometric plutonium dioxide

; ; ; ; ; Tagawa, Hiroaki

J. Nucl. Mater., 95, p.181 - 184, 1980/00

https://doi.org/10.1016/0022-3115(80)90092-6

Times Cited Count：16 Percentile：80.88(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Determination of oxygen in ternary uranium oxides by a gravimetric alkaline earth addition method

Fujino, Takeo; Tagawa, Hiroaki

Analytica Chimica Acta, 107, p.365 - 371, 1979/00

https://doi.org/10.1016/S0003-2670(01)93228-3

Times Cited Count：3

no abstracts in English

Journal Articles

Lattice parameter of uranium mononitride

; Tagawa, Hiroaki

J. Nucl. Mater., 79(1), p.264 - 266, 1979/00

https://doi.org/10.1016/0022-3115(79)90457-4

Times Cited Count：32

no abstracts in English

Journal Articles

Formation of uranium mononitride by the reaction of uranium dioxide with carbon in ammonia and a mixture of hydrogen and nitrogen, 2; Reaction rates

; Tagawa, Hiroaki

J. Nucl. Mater., 80(2), p.330 - 338, 1979/00

https://doi.org/10.1016/0022-3115(79)90196-X

Times Cited Count：15

no abstracts in English

Journal Articles

Thermodynamics of Mg $_{y}$ U $_{1}$ $_{-}$ $_{y}$ O $_{2}$ $_{+}$ $_{x}$ by EMF measurements, 2; Properties at low magnesium concentrations

; Fujino, Takeo; Tagawa, Hiroaki

Journal of Solid State Chemistry, 30(3), p.265 - 273, 1979/00

https://doi.org/10.1016/0022-4596(79)90237-8

Times Cited Count：16

no abstracts in English

Journal Articles

A Gravimetric method for the determination of oxygen in uranium oxides and ternary uranium oxides by addition of alkaline earth compounds

Fujino, Takeo; Tagawa, Hiroaki; ;

Analytica Chimica Acta, 98(2), p.373 - 383, 1978/02

https://doi.org/10.1016/S0003-2670(01)84067-8

Times Cited Count：3

no abstracts in English

Journal Articles

Mechanism and kinetics for the formation of uranium mononitride by the reaction of uranium dioxide with carbon and nitrogen

; Tagawa, Hiroaki

J.Am.Ceram.Soc., 61(1-2), p.30 - 35, 1978/02

https://doi.org/10.1111/j.1151-2916.1978.tb09223.x

Times Cited Count：22

no abstracts in English

Journal Articles

Thermodynamics of Mg $_{y}$ U $_{1}$ $_{-}$ $_{y}$ O $_{2}$ $_{+}$ $_{x}$ by EMf measurements, 1; Properties at high magnesium concentrations

Fujino, Takeo; ; Tagawa, Hiroaki

Journal of Solid State Chemistry, 24(1), p.11 - 19, 1978/01

https://doi.org/10.1016/S0022-4596(78)90179-2

Times Cited Count：30

no abstracts in English

Journal Articles

Atomic energy; Present and future

Tagawa, Hiroaki

Kagaku Kogaku, 1978(1), p.117 - 119, 1978/01

no abstracts in English

Journal Articles

Phase transformation of strontium monouranate (VI)

Tagawa, Hiroaki; Fujino, Takeo

Journal of Inorganic and Nuclear Chemistry, 40(12), p.2033 - 2036, 1978/00

https://doi.org/10.1016/0022-1902(78)80197-3

Times Cited Count：12

no abstracts in English

Journal Articles

Formation and properties of strontium Uranates

Tagawa, Hiroaki; Fujino, Takeo;

Bulletin of the Chemical Society of Japan, 50(11), p.2940 - 2944, 1977/11

https://doi.org/10.1246/bcsj.50.2940

Times Cited Count：9

no abstracts in English

Journal Articles

Anomalous behavior in the to transition of SrUO $_{4}$

Tagawa, Hiroaki; Fujino, Takeo

Inorg.Nucl.Chem.Lett., 13(10), p.489 - 493, 1977/10

https://doi.org/10.1016/0020-1650(77)80017-2

Times Cited Count：5

no abstracts in English

Journal Articles

Atomic Energy and its use in chemical industries

Tagawa, Hiroaki

Kagaku Kogyo, 28(7), p.765 - 769, 1977/07

https://ci.nii.ac.jp/naid/40000412231

no abstracts in English

Journal Articles

Formation of uranium mononitride by the reaction of uranium dioxide with carbon in ammonia and a mixture of hydrogen and nitrogen, 1; Synthesis of high purity UN

; Tagawa, Hiroaki

J. Nucl. Mater., 71(1), p.65 - 72, 1977/01

https://doi.org/10.1016/0022-3115(77)90187-8

Times Cited Count：33

no abstracts in English

Journal Articles

The Crystal structures of and SrUO $_{4}$

Fujino, Takeo; Masaki, N.; Tagawa, Hiroaki

Z.Kristallogr., 145(3-4), p.299 - 309, 1977/00

no abstracts in English

JAEA Reports

Nonstoichiometry in uranium sesquinitride

Tagawa, Hiroaki

JAERI-M 6874, 22 Pages, 1976/12

JAERI-M-6874.pdf:0.58MB

no abstracts in English

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Decommissioning report for Wastewater Treatment Facility (Part 2); Chapter on contamination inspection section

Development of a large-area alpha imaging detector for hand and foot monitors

Phase relations and crystal chemistry in the ternary UO $_{2}$ -PrO $_{1}$ $_{.}$ $_{5}$ -O $_{2}$ system

Oxidation-reduction properties of mixed oxides in the cerium-uranium-oxygen system

Electrical conductivity anomaly in near-stoichiometric plutonium dioxide

Determination of oxygen in ternary uranium oxides by a gravimetric alkaline earth addition method

Lattice parameter of uranium mononitride

Formation of uranium mononitride by the reaction of uranium dioxide with carbon in ammonia and a mixture of hydrogen and nitrogen, 2; Reaction rates

Thermodynamics of Mg $_{y}$ U $_{1}$ $_{-}$ $_{y}$ O $_{2}$ $_{+}$ $_{x}$ by EMF measurements, 2; Properties at low magnesium concentrations

A Gravimetric method for the determination of oxygen in uranium oxides and ternary uranium oxides by addition of alkaline earth compounds

Mechanism and kinetics for the formation of uranium mononitride by the reaction of uranium dioxide with carbon and nitrogen

Thermodynamics of Mg $_{y}$ U $_{1}$ $_{-}$ $_{y}$ O $_{2}$ $_{+}$ $_{x}$ by EMf measurements, 1; Properties at high magnesium concentrations

Atomic energy; Present and future

Phase transformation of strontium monouranate (VI)

Formation and properties of strontium Uranates

Anomalous behavior in the to transition of SrUO $_{4}$

Atomic Energy and its use in chemical industries

Formation of uranium mononitride by the reaction of uranium dioxide with carbon in ammonia and a mixture of hydrogen and nitrogen, 1; Synthesis of high purity UN

The Crystal structures of and SrUO $_{4}$

Nonstoichiometry in uranium sesquinitride