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Journal Articles

Solidification/stabilization of low-level radioactive wastes including hazardous substances from uranium fuel processing plants

Sato, Junya; Takahashi, Yuta; Sunahara, Jun*; Saito, Toshimitsu*; Yoshida, Yukihiko; Sone, Tomoyuki; Osugi, Takeshi

Progress in Nuclear Science and Technology (Internet), 8, p.307 - 312, 2025/09

https://doi.org/10.15669/pnst.8.307

JAEA Reports

Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY2020

Nakada, Akira; Nakano, Masanao; Kanai, Katsuta; Seya, Natsumi; Nishimura, Shusaku; Nemoto, Masashi; Tobita, Keiji; Futagawa, Kazuo; Yamada, Ryohei; Uchiyama, Rei; et al.

JAEA-Review 2021-062, 163 Pages, 2022/02

JAEA-Review-2021-062.pdf:2.87MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed by the Nuclear Fuel Cycle Engineering Laboratories, based on "Safety Regulations for the Reprocessing Plant of Japan Atomic Energy Agency, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitant due to the radioactivity discharged from the plant to the atmosphere and the sea during April 2020 to March 2021. In this report, some data include the influence of the accidental release from the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Co., Inc. (the trade name was changed to Tokyo Electric Power Company Holdings, Inc. on April 1, 2016) in March 2011. Appendices present comprehensive information, such as monitoring programs, monitoring methods, monitoring results and their trends, meteorological data and discharged radioactive wastes. In addition, the data which were influenced by the accidental release and exceeded the normal range of fluctuation in the monitoring, were evaluated.

JAEA Reports

Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY2019

Nakano, Masanao; Fujii, Tomoko; Nemoto, Masashi; Tobita, Keiji; Seya, Natsumi; Nishimura, Shusaku; Hosomi, Kenji; Nagaoka, Mika; Yokoyama, Hiroya; Matsubara, Natsumi; et al.

JAEA-Review 2020-069, 163 Pages, 2021/02

JAEA-Review-2020-069.pdf:4.78MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed by the Nuclear Fuel Cycle Engineering Laboratories, based on "Safety Regulations for the Reprocessing Plant of Japan Atomic Energy Agency, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitant due to the radioactivity discharged from the plant to the atmosphere and the sea during April 2019 to March 2020. In this report, some data include the influence of the accidental release from the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Co., Inc. (the trade name was changed to Tokyo Electric Power Company Holdings, Inc. on April 1, 2016) in March 2011. Appendices present comprehensive information, such as monitoring programs, monitoring methods, monitoring results and their trends, meteorological data and discharged radioactive wastes. In addition, the data which were influenced by the accidental release and exceeded the normal range of fluctuation in the monitoring, were evaluated.

JAEA Reports

Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY2018

Nakano, Masanao; Fujii, Tomoko; Nemoto, Masashi; Tobita, Keiji; Kono, Takahiko; Hosomi, Kenji; Nishimura, Shusaku; Matsubara, Natsumi; Maehara, Yushi; Narita, Ryosuke; et al.

JAEA-Review 2019-048, 165 Pages, 2020/03

JAEA-Review-2019-048.pdf:2.69MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed by the Nuclear Fuel Cycle Engineering Laboratories, based on "Safety Regulations for the Reprocessing Plant of Japan Atomic Energy Agency, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitant due to the radioactivity discharged from the plant to the atmosphere and the sea during April 2018 to March 2019. In this report, some data include the influence of the accidental release from the Fukushima Daiichi Nuclear Power Station of Tokyo Electric Power Co., Inc. (the trade name was changed to Tokyo Electric Power Company Holdings, Inc. on April 1, 2016) in March 2011. Appendices present comprehensive information, such as monitoring programs, monitoring methods, monitoring results and their trends, meteorological data and discharged radioactive wastes. In addition, the data which were influenced by the accidental release and exceeded the normal range of fluctuation in the monitoring, were evaluated.

JAEA Reports

Annual report on the environmental radiation monitoring around the Tokai Reprocessing Plant FY2017

Nakano, Masanao; Fujita, Hiroki; Mizutani, Tomoko; Nemoto, Masashi; Tobita, Keiji; Kono, Takahiko; Hosomi, Kenji; Hokama, Tomonori; Nishimura, Tomohiro; Matsubara, Natsumi; et al.

JAEA-Review 2018-025, 171 Pages, 2019/02

JAEA-Review-2018-025.pdf:3.81MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed by the Nuclear Fuel Cycle Engineering Laboratories, based on "Safety Regulations for the Reprocessing Plant of Japan Atomic Energy Agency, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitant due to the radioactivity discharged from the plant to the atmosphere and the sea during April 2016 to March 2017. In this report, some data include the influence of the accidental release from the Fukushima Daiichi Nuclear Power Station of Electric Power Company Holdings, Inc. in March 2011. Appendices present comprehensive information, such as monitoring programs, monitoring methods, monitoring results and their trends, meteorological data and discharged radioactive wastes. In addition, the data which were influenced by the accidental release and were exceeded the normal range of fluctuation in the monitoring, were evaluated.

Journal Articles

Angle-resolved photoemission analysis of electronic structures for thermoelectric properties of off-stoichiometric Fe$$_{2-x}$$V$$_{1+x}$$Al alloys

Soda, Kazuo*; Harada, Shota*; Hayashi, Toshimitsu*; Kato, Masahiko*; Ishikawa, Fumihiro*; Yamada, Yu*; Fujimori, Shinichi; Saito, Yuji

Materials Transactions, 57(7), p.1040 - 1044, 2016/06

https://doi.org/10.2320/matertrans.MF201603
 Times Cited Count：3 Percentile：14.96(Materials Science, Multidisciplinary)

Journal Articles

Growth of PrFeAsO$$_{1-y}$$ single crystals and its characterization

Ishikado, Motoyuki; Shamoto, Shinichi; Kito, Hijiri*; Iyo, Akira*; Eisaki, Hiroshi*; Ito, Toshimitsu*; Tomioka, Yasuhide*

Physica C, 470(Suppl.1), p.S322 - S323, 2010/12

https://doi.org/10.1016/j.physc.2009.11.165
 Times Cited Count：3 Percentile：15.84(Physics, Applied)

Single crystals of oxygen deficient oxypnictide superconductor PrFeAsO$$_{1-y}$$ have been grown by using belt-type anvil high pressure synthesis apparatus. Superconducting transition temperature ($textit{T$_c$}$) of the obtained single crystal is 45 K, and typical size is about 800 $$times$$ 1000 $$times$$ 30 $$mu m^3$$. In-plane electrical resistivity shows almost proportional to temperature as well as the copper oxide high temperature superconductors, suggesting the existence of effects of strong inelastic scattering like copper oxide high temperature superconductor. In addition, we obtained non-superconducting parent single crystal by annealing the as-grown single crystal under ambient pressure. Resistivity of parent single crystal is characterized by the kink near 150 K corresponding to the structural transition, and the structure near 12 K, which is thought to be originating from the magnetic order of Pr ion.

Journal Articles

Strong carrier-scattering in iron-pnictide superconductors ${it Ln}$FeAsO$$_{1-y}$$ (${it Ln}$ = La and Nd) obtained from charge transport experiments

Ishida, Shigeyuki*; Nakajima, Masamichi*; Tomioka, Yasuhide*; Ito, Toshimitsu*; Miyazawa, Kiichi*; Kito, Hijiri*; Lee, C.-H.*; Ishikado, Motoyuki; Shamoto, Shinichi; Iyo, Akira*; et al.

Physical Review B, 81(9), p.094515_1 - 094515_6, 2010/03

https://doi.org/10.1103/PhysRevB.81.094515
 Times Cited Count：22 Percentile：63.53(Materials Science, Multidisciplinary)

Characteristic normal-state charge transport is found in the oxygen-deficient iron-arsenides ${it Ln}$FeAsO$$_{1-y}$$ (${it Ln}$: La and Nd) with the highest ${it T}$ $$_{c}$$'s among known Fe-based superconductors. The effect of "doping" in this system is mainly on the carrier scattering, quite distinct from that in high-${it T}$ $$_{c}$$ cuprates. In the superconducting regime of the La system with maximum ${it T}$ $$_{c}$$ = 28 K, the low-temperature resistivity is dominated by a ${it T}$ $$^{2}$$ term. On the other hand, in the Nd system with ${it T}$ $$_{c}$$ higher than 40 K, the carriers are subject to stronger scattering showing ${it T}$ -linear resistivity and small magnetoresistance. Such strong scattering appears crucial for high-${it T}$ $$_{c}$$ superconductivity in the iron-based system.

Journal Articles

Muon spin rotation measurements of heterogeneous field response in overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$

MacDougall, G. J.*; Savici, A. T.*; Aczel, A. A.*; Birgeneau, R. J.*; Kim, H.*; Kim, S.-J.*; Ito, Toshimitsu*; Rodriguez, J. A.*; Russo, P. L.*; Uemura, Yasutomo*; et al.

Physical Review B, 81(1), p.014508_1 - 014508_7, 2010/01

https://doi.org/10.1103/PhysRevB.81.014508
 Times Cited Count：11 Percentile：43.77(Materials Science, Multidisciplinary)

Journal Articles

Growth of single crystal PrFeAsO$$_{1-y}$$ and its characterization

Ishikado, Motoyuki; Shamoto, Shinichi; Kito, Hijiri*; Iyo, Akira*; Eisaki, Hiroshi*; Ito, Toshimitsu*; Tomioka, Yasuhide*

Physica C, 469(15-20), p.901 - 904, 2009/10

https://doi.org/10.1016/j.physc.2009.05.094
 Times Cited Count：23 Percentile：64.33(Physics, Applied)

We have successfully grown single crystals of oxygen deficient oxypnictide superconductor PrFeAsO$$_{1-y}$$ by belt-type anvil apparatus using high pressure synthesis method.

Journal Articles

Observation of itinerant Ce 4$$f$$ electronic states in CeIrSi$$_3$$ studied by angle-resolved Ce 3$$drightarrow 4f$$ resonance photoemission spectroscopy

Okochi, Takuo*; Toshimitsu, Takafumi*; Yamagami, Hiroshi; Fujimori, Shinichi; Yasui, Akira; Takeda, Yukiharu; Okane, Tetsuo; Saito, Yuji; Fujimori, Atsushi; Miyauchi, Yuichiro*; et al.

Journal of the Physical Society of Japan, 78(8), p.084802_1 - 084802_6, 2009/08

https://doi.org/10.1143/JPSJ.78.084802
 Times Cited Count：10 Percentile：52.93(Physics, Multidisciplinary)

We have applied angle-resolved Ce 3$$d{rightarrow}$$4$$f$$ resonance photoemission spectroscopy to the non-centrosymmetric pressure-induced superconductor CeIrSi$$_3$$ and obtained the 4$$f$$ band-structure and Fermi surfaces. We have found that the Ce 4$$f$$ states are located mainly near the Fermi level and that the photoemission intensity derived from the dispersive conduction bands across the Fermi level shows considerable resonant enhancement. In addition, the band structure and Fermi surfaces of CeIrSi$$_3$$ are different from those of the non-$$f$$ reference compound, LaIrSi$$_3$$ and the difference is well explained by the band structure calculated within the local density approximation (LDA). These results strongly suggest that the Ce 4$$f$$ electrons in CeIrSi$$_3$$ are well hybridized with conduction bands and form itinerant electronic states.

Journal Articles

High-pressure synthesis and physical properties of new iron (nickel)-based superconductors

Shirage, P. M.*; Miyazawa, Kiichi*; Ishikado, Motoyuki; Kiho, Kunihiro*; Lee, C.-H.*; Takeshita, Nao*; Matsuhata, Hirofumi*; Kumai, Reiji*; Tomioka, Yasuhide*; Ito, Toshimitsu*; et al.

Physica C, 469(9-12), p.355 - 369, 2009/06

https://doi.org/10.1016/j.physc.2009.03.027
 Times Cited Count：42 Percentile：79.43(Physics, Applied)

We have utilized a high-pressure (HP) technique to synthesize a series of newly-discovered iron (nickel)-based superconductors. The effect of (O)-deficiency, variation of $$Ln$$ ions, and the external pressure on $$T$$$$_{rm c}$$ are examined. All the experimental data indicate strong correlation between the crystal structure and the superconductivity of the oxypnictide superconductors. Upper critical field measurement on single crystalline sample of PrFeAsO$$_{1-y}$$ shows the superconducting anisotropy of 5, which is smaller than cuprates. We also demonstrate that HP technique is applicable for the so-called "122" systems.

Journal Articles

Absence of broken time-reversal symmetry in the pseudogap state of the high temperature La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ superconductor from muon-spin-relaxation measurements

MacDougall, G. J.*; Aczel, A. A.*; Carlo, J. P.*; Ito, Toshimitsu*; Rodriguez, J.*; Russo, P. L.*; Uemura, Yasutomo*; Wakimoto, Shuichi; Luke, G. M.*

Physical Review Letters, 101(1), p.017001_1 - 017001_4, 2008/07

https://doi.org/10.1103/PhysRevLett.101.017001
 Times Cited Count：60 Percentile：87.24(Physics, Multidisciplinary)

We have performed zero-field muon spin rotation measurements on single crystals of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ to search for spontaneous currents in the pseudo-gap state. By comparing measurements on materials across the phase diagram, we put strict upper limits on any possible time-reversal symmetry breaking fields that could be associated with the pseudo-gap. Comparison between experimental limits and proposed circulating current states effectively eliminates the possibility that such states exist in this family of materials.

Journal Articles

Remote-welding technique for assembling In-Pile IASCC capsule in hot cell

Kawamata, Kazuo; Ishii, Toshimitsu; Kanazawa, Yoshiharu; Iwamatsu, Shigemi; Omi, Masao; Shimizu, Michio; Matsui, Yoshinori; Ugachi, Hirokazu; Kaji, Yoshiyuki; Tsukada, Takashi; et al.

JAEA-Conf 2006-003, p.115 - 125, 2006/05

https://jopss.jaea.go.jp/pdfdata/JAEA-Conf-2006-003.pdf

no abstracts in English

Journal Articles

Effects of hole doping on magnetic ground and excited states in the edge-sharing CuO$$_2$$ chains of Ca$$_{2+x}$$Y$$_{2-x}$$Cu$$_5$$O$$_{10}$$

Matsuda, Masaaki; Kakurai, Kazuhisa; Kurogi, Shogo*; Kudo, Kazutaka*; Koike, Yoji*; Yamaguchi, Hirotaka*; Ito, Toshimitsu*; Oka, Kunihiko*

Physical Review B, 71(10), p.104414_1 - 104414_8, 2005/03

https://doi.org/10.1103/PhysRevB.71.104414
 Times Cited Count：13 Percentile：48.42(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Polarized neutron scattering study of the CuO$$_{2}$$ chains in Ca$$_{2}$$Y$$_{2}$$Cu$$_{5}$$O$$_{10}$$

Matsuda, Masaaki; Nakamura, Mitsutaka; Takeda, Masayasu*; Kakurai, Kazuhisa; Yamaguchi, Hirotaka*; Ito, Toshimitsu*; Oka, Kunihiko*

Physica B; Condensed Matter, 329-333(1-4), p.711 - 712, 2003/05

https://doi.org/10.1016/S0921-4526(02)02020-3
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Detailed magnetic structure of the coupled edge-sharing CuO$$_{2}$$ chains in Ca$$_{2+x}$$Y$$_{2-x}$$Cu$$_{5}$$O$$_{10}$$

Matsuda, Masaaki; Kakurai, Kazuhisa; Yamaguchi, Hirotaka*; Ito, Toshimitsu*; Lee, C.-H.*; Oka, Kunihiko*

Applied Physics A, 74(Suppl.1), p.S637 - S639, 2002/12

https://doi.org/10.1007/s003390201569
 Times Cited Count：3 Percentile：15.61(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Development of a non-destructive testing technique using ultrasonic wave for evaluation of irradiation embrittlement in nuclear materials

Ishii, Toshimitsu; Ooka, Norikazu; Hoshiya, Taiji; Kobayashi, Hideo*; Saito, Junichi; Niimi, Motoji; Tsuji, Hirokazu

Journal of Nuclear Materials, 307-311(Part.1), p.240 - 244, 2002/12

https://doi.org/10.1016/S0022-3115(02)01035-8
 Times Cited Count：3 Percentile：22.28(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Development of a remote-controlled fatigue test machine using a laser extensometer in Hot Laboratory for study of irradiation effect on fatigue properties

Ishii, Toshimitsu; Yonekawa, Minoru; Omi, Masao; Takada, Fumiki; Saito, Junichi; Ioka, Ikuo; Miwa, Yukio

KAERI/GP-192/2002, p.157 - 166, 2002/00

no abstracts in English

Journal Articles

Current status and future prospects of JMTR Hot Laboratory

Saito, Junichi; Ishii, Toshimitsu; Omi, Masao; Fujiki, Kazuo; Ito, Haruhiko; Takahashi, Hidetake

KAERI/GP-192/2002, p.3 - 11, 2002/00

no abstracts in English

48 (Records 1-20 displayed on this page)