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Journal Articles

Visualization of the boron distribution in core material melting and relocation specimen by neutron energy resolving method

Abe, Yuta; Tsuchikawa, Yusuke; Kai, Tetsuya; Matsumoto, Yoshihiro*; Parker, J. D.*; Shinohara, Takenao; Oishi, Yuji*; Kamiyama, Takashi*; Nagae, Yuji; Sato, Ikken

JPS Conference Proceedings (Internet), 33, p.011075_1 - 011075_6, 2021/03

Journal Articles

Feasibility study of PGAA for boride identification in simulated melted core materials

Tsuchikawa, Yusuke; Abe, Yuta; Oishi, Yuji*; Kai, Tetsuya; Toh, Yosuke; Segawa, Mariko; Maeda, Makoto; Kimura, Atsushi; Nakamura, Shoji; Harada, Masahide; et al.

JPS Conference Proceedings (Internet), 33, p.011074_1 - 011074_6, 2021/03

In the decommissioning of the Fukushima-Daiichi (1F) Nuclear Power Plant, it is essential to understand characteristics of the melted core materials. The estimation of boride in the real debris is of great importance to develop safe debris removal plans. Hence, it is required to investigate the amount of boron in the melted core materials with nondestructive methods. Prompt gamma-ray activation analysis (PGAA) is one of the useful techniques to determine the amount of borides by means of the 478 keV prompt gamma-ray from neutron absorption reaction of boron. Moreover, it is well known that the width of the 478 keV gamma-ray peak is typically broadened due to the Doppler effect. The degree of the broadening is affected by coexisting materials, and can be recognized by the width of the prompt gamma-ray peak. As a feasibility study, the prompt gamma-ray from boride samples were measured using the ANNRI, NOBORU, and RADEN beamlines at the Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Complex (J-PARC).

Journal Articles

Measurement of Doppler broadening of prompt gamma-rays from various zirconium- and ferro-borons

Tsuchikawa, Yusuke; Kai, Tetsuya; Abe, Yuta; Oishi, Yuji*; Sun, Y.*; Oikawa, Kenichi; Nakatani, Takeshi; Sato, Ikken

Nuclear Instruments and Methods in Physics Research A, 991, p.164964_1 - 164964_5, 2021/03

 Times Cited Count:0 Percentile:0.03(Instruments & Instrumentation)

Peak shape analysis was performed for the energy spectra of Doppler-broadened prompt $$gamma$$-rays generated by neutron capture reactions with various boride or boron samples. Significant differences were observed between nonmetallic and metallic borides. Minor differences between the peak shapes of prompt $$gamma$$-rays from zirconium- and ferro-borons were evaluated by a peak fitting method. The identification of zirconium- and ferro-borons and other types of borides was estimated.

Journal Articles

Development of three-dimensional distribution visualization technology for boron using energy resolved neutron-imaging system (RADEN)

Abe, Yuta; Tsuchikawa, Yusuke; Kai, Tetsuya; Matsumoto, Yoshihiro*; Parker, J. D.*; Shinohara, Takenao; Oishi, Yuji*; Kamiyama, Takashi*; Nagae, Yuji; Sato, Ikken

Proceedings of 2020 International Conference on Nuclear Engineering (ICONE 2020) (Internet), 6 Pages, 2020/08

Journal Articles

Measurement of neutron scattering cross section of nano-diamond with particle diameter of approximately 5 nm in energy range of 0.2 meV to 100 meV

Teshigawara, Makoto; Tsuchikawa, Yusuke*; Ichikawa, Go*; Takata, Shinichi; Mishima, Kenji*; Harada, Masahide; Oi, Motoki; Kawamura, Yukihiko*; Kai, Tetsuya; Kawamura, Seiko; et al.

Nuclear Instruments and Methods in Physics Research A, 929, p.113 - 120, 2019/06

 Times Cited Count:7 Percentile:75.46(Instruments & Instrumentation)

A nano-diamond is an attractive neutron reflection material below cold neutron energy. The total neutron cross section of a nano-diamond was derived from a neutron transmission measurement over the neutron energy range of 0.2 meV to 100 meV because total neutron cross section data were not available. The total cross section of a nano-diamond with particle size of approximately 5 nm increased with a decrease in neutron energy to 0.2 meV. It was approximately two orders of magnitude larger than that of graphite at 0.2 meV. The contribution of inelastic scattering to the total cross section was to be shown negligible small at neutron energies of 1.2, 1.5, 1.9, 2.6, and 5.9 meV in the inelastic neutron scattering measurement. Moreover, small-angle neutron scattering measurements of the nano-diamond showed a large scattering cross section in the forward direction for low neutron energies.

Oral presentation

Fast neutron imaging capability at NOBORU and RADEN of J-PARC

Tsuchikawa, Yusuke; Kai, Tetsuya; Shinohara, Takenao; Parker, J. D.*; Oikawa, Kenichi

no journal, , 

The characteristics of NOBORU and RADEN are discussed from a viewpoint of neutron imaging with higher energy neutrons. Then some results of imaging with neutrons between 0.5 eV and $$sim$$MeV are presented. The authors also introduce an activity of developing a neutron imaging detector based on a lithium glass scintillator and a multi-anode photomultiplier tube to obtain a high efficiency at higher energies.

Oral presentation

Boron imaging with prompt gamma-ray activation analysis

Tsuchikawa, Yusuke; Abe, Yuta; Oishi, Yuji*; Kai, Tetsuya; Harada, Masahide; Oikawa, Kenichi; Matsumoto, Yoshihiro*; Parker, J. D.*; Shinohara, Takenao; Nagae, Yuji; et al.

no journal, , 

In the decommissioning of the Fukushima-Daiichi (1F) Nuclear Power Plant, it is essential to understand characteristics of the melted core materials. The estimation of boride in the real debris is of great importance to develop safe debris removal plans. Hence, it is required to investigate the amount of boron in the melted core materials with nondestructive methods. Prompt gamma-ray activation analysis (PGAA) is one of the useful techniques to determine the amount of borides by means of the 478 keV prompt gamma-ray from neutron absorption reaction of boron. Moreover, it is well known that the width of the 478 keV gamma-ray peak is typically broadened due to the Doppler effect. The degree of the broadening is affected by coexisting materials, and can be recognized by the width of the prompt gamma-ray peak. As a feasibility study, the prompt gamma-ray from boride samples were measured using the NOBORU, and RADEN beamlines at the Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Complex (J-PARC).

Oral presentation

Development of visualization technology for boron using energy resolved neutron imaging

Abe, Yuta; Kai, Tetsuya; Tsuchikawa, Yusuke; Matsumoto, Yoshihiro*; Parker, J. D.*; Shinohara, Takenao; Oishi, Yuji*; Kamiyama, Takashi*; Nagae, Yuji; Sato, Ikken

no journal, , 

福島第一原子力発電所事故Fukushima Daiichi Nuclear Power Station Accident

Oral presentation

Development of Three-Dimensional Distribution Visualization Technology for Boron using Energy Resolved Neutron-Imaging System (RADEN)

Abe, Yuta; Kai, Tetsuya; Tsuchikawa, Yusuke; Matsumoto, Yoshihiro*; Parker, J. D.*; Shinohara, Takenao; Kamiyama, Takashi*; Oishi, Yuji*; Nagae, Yuji; Sato, Ikken

no journal, , 

no abstracts in English

Oral presentation

Quantitative measurement of boron and boride identification using neutron beam

Tsuchikawa, Yusuke; Kai, Tetsuya; Abe, Yuta; Oishi, Yuji*; Sun, Y.*; Oikawa, Kenichi; Nakatani, Takeshi; Sato, Ikken; Joseph, P.*; Matsumoto, Yoshihiro*

no journal, , 

In the decommissioning of the Fukushima Daiichi Nuclear Power Plant (NPP), the quantitative analysis of residual boron and borides in the reactor core and the identification of boron compound states are one of the important issues to be investigated. In this presentation, we report on the neutron energy-resolved analysis of boron samples irradiated with neutrons at J-PARC/MLF. We also investigated the possibility of identifying the compounds using peak broadening of the prompt gamma rays for each boride. The prompt gamma-ray peak-widths of metallic and non-metallic borides were significantly different from each other, while those of zirconium boride and iron boride were slightly different. The differences between these metal borides were measured and evaluated in detail by gamma-ray energy spectrum analysis. Finally, we will briefly introduce the current experiments and analysis results of our efforts toward two- and three-dimensional quantitative measurements using energy-analyzed two-dimensional detectors.

Oral presentation

Visualization of adsorption and elution behavior inside the column by neutron resonance absorption imaging

Miyazaki, Yasunori; Sato, Daisuke; Watanabe, So; Nakamura, Masahiro; Shibata, Atsuhiro; Nomura, Kazunori; Kai, Tetsuya; Tsuchikawa, Yusuke; Parker, J. D.*

no journal, , 

no abstracts in English

Oral presentation

Development of boron-distribution visualization technique with neutron energy analysis

Tsuchikawa, Yusuke; Kai, Tetsuya; Shinohara, Takenao; Oikawa, Kenichi; Abe, Yuta; Oishi, Yuji*; Parker, J. D.*; Matsumoto, Yoshihiro*; Nagae, Yuji; Sato, Ikken

no journal, , 

no abstracts in English

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