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Journal Articles

Gamma-ray spectroscopy with a CeBr$$_3$$ scintillator under intense $$gamma$$-ray fields for nuclear decommissioning

Kaburagi, Masaaki; Shimazoe, Kenji*; Kato, Masahiro*; Kurosawa, Tadahiro*; Kamada, Kei*; Kim, K. J.*; Yoshino, Masao*; Shoji, Yasuhiro*; Yoshikawa, Akira*; Takahashi, Hiroyuki*; et al.

Nuclear Instruments and Methods in Physics Research A, 988, p.164900_1 - 164900_8, 2021/02

 Times Cited Count:3 Percentile:84.28(Instruments & Instrumentation)

An increasing number of nuclear facilities have been decommissioned worldwide following the 2011 accident of the TEPCO' Fukushima Daiichi Nuclear Power Station. During the decommissioning, radioactive materials have to be retrieved under proper management. In this study, a small cubic CeBr$$_3$$ spectrometer with dimensions of 5 mm $$times$$ 5 mm $$times$$ 5 mm was manufactured to perform $$gamma$$-ray spectroscopy under intense $$gamma$$-ray fields. Furthermore, thanks to a fast digital process unit and a customized photomultiplier, the device could perform $$gamma$$-ray spectroscopy at dose rates of over 1 Sv/h. The energy resolution (FWHM) at 662 keV ranged from 4.4% at 22 mSv/h to 5.2% at 1407 mSv/h for a $$^{137}$$Cs radiation field. Correspondingly, at 1333 keV, it ranged from 3.1% at 26 mSv/h to 4.2% at 2221 mSv/h for a $$^{60}$$Co radiation field, which suggested to realize $$gamma$$-ray assessment of $$^{134}$$Cs, $$^{137}$$Cs, $$^{60}$$Co, and $$^{154}$$Eu at dose rates of over 1 Sv/h.

Journal Articles

A Cubic CeBr$$_{3}$$ gamma-ray spectrometer suitable for the decommissioning of the Fukushima Daiichi Nuclear Power Station

Kaburagi, Masaaki; Shimazoe, Kenji*; Otaka, Yutaka*; Uenomachi, Mizuki*; Kamada, Kei*; Kim, K. J.*; Yoshino, Masao*; Shoji, Yasuhiro*; Yoshikawa, Akira*; Takahashi, Hiroyuki*; et al.

Nuclear Instruments and Methods in Physics Research A, 971, p.164118_1 - 164118_8, 2020/08

 Times Cited Count:4 Percentile:68.2(Instruments & Instrumentation)

Journal Articles

Synthesis and characterization of CeO$$_{2}$$-based simulated fuel containing CsI

Takamatsu, Yuki*; Ishii, Hiroto*; Oishi, Yuji*; Muta, Hiroaki*; Yamanaka, Shinsuke*; Suzuki, Eriko; Nakajima, Kunihisa; Miwa, Shuhei; Osaka, Masahiko; Kurosaki, Ken*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 17(3/4), p.106 - 110, 2018/12

In order to establish the synthesis method of simulated fuel contacting Cesium (Cs) which is required for the evaluation of physical/chemical characteristics in fuel and release behavior of Cs, sintering tests of the cerium dioxide (CeO$$_{2}$$) based simulated fuels containing Cesium iodide (CsI) are performed by using spark plasma sintering (SPS) method. The sintered CeO$$_{2}$$ pellets with homogeneous distribution of several micro meter of CsI spherical precipitates were successfully obtained by optimizing SPS conditions.

Journal Articles

Investigation of ligand immobilized nano-composite adsorbent for efficient cerium(III) detection and recovery

Awual, M. R.; Hasan, M. M.*; Shahat, A.*; Naushad, M.*; Shiwaku, Hideaki; Yaita, Tsuyoshi

Chemical Engineering Journal, 265, p.210 - 218, 2015/04

 Times Cited Count:195 Percentile:99.27(Engineering, Environmental)

JAEA Reports

Development and installation of thermal diffusivity measurement apparatus for minor actinide compounds (Contract research)

Nishi, Tsuyoshi; Takano, Masahide; Ito, Akinori; Akabori, Mitsuo; Minato, Kazuo; Kizaki, Minoru

JAERI-Tech 2005-051, 13 Pages, 2005/09

JAERI-Tech-2005-051.pdf:1.38MB

An apparatus has been developed to measure the thermal diffusivities of minor actinide (MA) compounds. By installing the laser flash apparatus in a glove box with highly purified inert gas atmosphere, the thermal diffusivities measurement of MA compounds of $$alpha$$-decay nuclides was enabled. A new sample holder has been also developed to measure the thermal diffusivities of very small samples. The performance of this new apparatus was confirmed by measuring the thermal diffusivities of small samples of tantalum, nickel and cerium oxides. The thermal diffusivity values obtained in this work agreed well with the literature values and the values measured by a conventional thermal diffusivities measurement apparatus. Accordingly, this apparatus was found to be useful for thermal diffusivities measurement of MA compounds.

JAEA Reports

Production of $$^{139}$$Ce by the $$^{139}$$La(p,n)$$^{139}$$Ce reaction

Ishioka, Noriko; Izumo, Mishiroku; Hashimoto, Kazuyuki; Kobayashi, Katsutoshi; Matsuoka, Hiromitsu; Sekine, Toshiaki

JAERI-Tech 2001-095, 23 Pages, 2002/01

JAERI-Tech-2001-095.pdf:1.1MB

no abstracts in English

Journal Articles

Measurement of hold-up times in a thermal ion source for metallic and monoxide ions of lanthanum and cerium

; Sekine, Toshiaki; ; Oshima, Masumi

Nuclear Instruments and Methods in Physics Research B, 70, p.156 - 159, 1992/00

 Times Cited Count:7 Percentile:61.39(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Chemical decontamination process with sulfuric acid-cerium(IV) for decommissioning; Decontamination of dismantled components

Suwa, Takeshi; *; *; Tachikawa, Enzo

Proc. of 1991 JAIF Int. Conf. on Water Chemistry in Nuclear Power Plants: Water Chemistry,91, p.737 - 742, 1991/00

no abstracts in English

Journal Articles

Dissolution behavior of nickel ferrite in sulfuric acid; Cerium(IV) solution

; ; Tachikawa, Enzo

Boshoku Gijutsu, 36(4), p.204 - 209, 1987/04

no abstracts in English

Journal Articles

Dissolution behavior of chromium-rich oxides in sulfuric acid-cerium(IV) solution

; ; Tachikawa, Enzo

Boshoku Gijutsu, 36(3), p.127 - 133, 1987/00

no abstracts in English

Journal Articles

Measurement of cerium(IV) concentration in sulfuric acid and nitric acid solutions by cyclic voltammetry

; ; ; Tachikawa, Enzo

Denki Kagaku, 54, p.974 - 976, 1986/00

no abstracts in English

Journal Articles

Development of chemical decontamination process with sulfuric acid-cerium(IV)for decommissioning; Single step process to dissolve chromium-rich oxides

; ; Tachikawa, Enzo

Journal of Nuclear Science and Technology, 23(7), p.622 - 632, 1986/00

 Times Cited Count:6 Percentile:59.54(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Electron Probe Micro-Analysis of Irradiated Triso-Coated UO$$_{2}$$ Particles,-(II)

Minato, Kazuo; ; ; Ikawa, Katsuichi; Iwamoto, K.

JAERI-M 84-002, 56 Pages, 1984/02

JAERI-M-84-002.pdf:3.1MB

no abstracts in English

JAEA Reports

Studies on Closed-Cycle for Hydrogen ProductionIII Progress Report for the F.Y.1977

; Ikezoe, Yasumasa; Shimizu, Saburo; Nakajima, Hayato;

JAERI-M 7927, 43 Pages, 1978/10

JAERI-M-7927.pdf:1.33MB

no abstracts in English

Oral presentation

Thermal conductivity of uranium-cerium mixed oxide

Hiroka, Shun; Nelson, A.*; White, J.*; Kato, Masato; McClellan, K.*

no journal, , 

Thermal diffusivity of (U$$_{0.7}$$Ce$$_{0.3}$$)O$$_{2}$$ and (U$$_{0.8}$$Ce$$_{0.2}$$)O$$_{2}$$ was measured by laser flash method as a function of oxygen-to-metal ratio over the temperature range of 373 K to 1473 K and the thermal conductivity was evaluated. Only stoichiometric data of thermal conductivity of (U,Ce)O$$_{2}$$ was reported and that was comparable with thermal conductivity obtained in this work. Thermal conductivity was highest at stoichiometry, and was not perfectly symmetric with respect to the stoichiometry but slightly lower for hyper-stoichiometric compositions. The thermal conductivity of (U,Ce)O$$_{2}$$ showed the trend with temperature to be comparable to that of (U,Pu)O$$_{2}$$. However, the thermal resistivity did not follow the linear function of temperature, A+BT, which is an unique characteristics in (U,Ce)O$$_{2}$$.

17 (Records 1-17 displayed on this page)
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