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Journal Articles

Using CO$$_{2}$$ Reactions to Achieve Mass-spectrometric Discrimination in Simultaneous Plutonium-isotope Speciation with Inductively Coupled Plasma-Tandem Mass Spectrometry

Matsueda, Makoto; Kawakami, Tomohiko*; Koarai, Kazuma; Terashima, Motoki; Fujiwara, Kenso; Iijima, Kazuki; Furukawa, Makoto*; Takagai, Yoshitaka*

Chemistry Letters, 51(7), p.678 - 682, 2022/07

 Times Cited Count:2 Percentile:63.98(Chemistry, Multidisciplinary)

New methodology for a simultaneous isotope speciation of various Pu isotopes without complicated isobaric interferences is developed by using inductively coupled plasma-mass spectrometry (ICP-MS). In analyzing ICP tandem MS (ICP-MS/MS), CO$$_{2}$$ gas reactions in a dynamic reaction cell (DRC) almost eliminated the background noise intensity produced by isobaric interference from isotopes originating from actinides such as Am, Cm, and U at the locations (m/z) of significant Pu isotopes ($$^{239}$$Pu, $$^{240}$$Pu, $$^{241}$$Pu, $$^{242}$$Pu, $$^{244}$$Pu).

Journal Articles

Sodium-cooled Fast Reactors

Ohshima, Hiroyuki; Morishita, Masaki*; Aizawa, Kosuke; Ando, Masanori; Ashida, Takashi; Chikazawa, Yoshitaka; Doda, Norihiro; Enuma, Yasuhiro; Ezure, Toshiki; Fukano, Yoshitaka; et al.

Sodium-cooled Fast Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.3, 631 Pages, 2022/07

This book is a collection of the past experience of design, construction, and operation of two reactors, the latest knowledge and technology for SFR designs, and the future prospects of SFR development in Japan. It is intended to provide the perspective and the relevant knowledge to enable readers to become more familiar with SFR technology.

Journal Articles

A New measuring method for elemental ratio and Vickers hardness of metal-oxide-boride materials based on Laser-Induced Breakdown Spectroscopy (LIBS)

Abe, Yuta; Otaka, Masahiko; Okazaki, Kodai*; Kawakami, Tomohiko*; Nakagiri, Toshio

Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 7 Pages, 2019/05

Since the hardness of fuel debris containing boride from B$$_{4}$$C pellet in control rod is estimated to be two times higher as that of oxide, such as UO$$_{2}$$ and ZrO$$_{2}$$, it is necessary to select the efficient and appropriate operation for removal of fuel debris formed in the severe accident of nuclear power plants. We focused on the characteristics of LIBS, an innovative rapid chemical in-situ analysis technology that enables simultaneous detection of B, O, and other metal elements in fuel debris. Simulated solidified melt specimens were obtained in the plasma heating tests (CMMR-0/-2, performed by JAEA) of simulated fuel assembly (ZrO$$_{2}$$ is used to simulated UO$$_{2}$$ pellet, other materials such as stainless steel, B$$_{4}$$C are same as fuel assembly). The LIBS signals of (B/O)/Zr ratio showed good linear relationship with Vickers hardness. This technique can be also applied as in-situ assessment tool for elemental composition and Vickers hardness of metal-oxide-boride materials.

Oral presentation

LIBS technique for test piece of high radioactive oxide contaminants

Kawakami, Tomohiko*; Nakano, Natsuko*; Takagi, Kazunari*; Spaziani, F.*; Hanamoto, Yukio*; Abe, Yuta

no journal, , 

no abstracts in English

Oral presentation

Consideration of material analysis using simulated fuel assembly heating test, 2; Study of the evaluation method by LIBS

Kawakami, Tomohiko*; Abe, Yuta; Spaziani, F.*; Nakano, Natsuko*; Nakagiri, Toshio

no journal, , 

no abstracts in English

Oral presentation

Evaluation method using material analysis of specimen in plasma heating experiment, 2; Application possibility of materials analysis and LIBS using the plasma basics heating experiment

Kawakami, Tomohiko*; Abe, Yuta; Spaziani, F.*; Nakano, Natsuko*; Nakagiri, Toshio

no journal, , 

no abstracts in English

Oral presentation

Establishment of evaluation method using material analysis of simulated fuel assembly heating test, 1; Outline of simulated fuel assembly heating test using non-transfer type plasma heating

Abe, Yuta; Nakagiri, Toshio; Yamashita, Takuya; Noro, Junji*; Matsushima, Tomohiro*; Kawakami, Tomohiko*

no journal, , 

no abstracts in English

Oral presentation

Establishment of evaluation method using material analysis of simulated fuel assembly heating test, 3; Evaluation method of oxygen and boron using LIBS

Okazaki, Kodai*; Abe, Yuta; Spaziani, F.*; Nakano, Natsuko*; Kawakami, Tomohiko*

no journal, , 

no abstracts in English

Oral presentation

Examination of measurement method of the hardness by Laser Induced Breakdown Spectroscopy (LIBS)

Okazaki, Kodai*; Kawakami, Tomohiko*; Abe, Yuta; Otaka, Masahiko; Sato, Ikken

no journal, , 

no abstracts in English

Oral presentation

Examination of stabilization treatment method of radioactive aluminum waste

Seki, Misaki; Ishikawa, Koji*; Nagata, Hiroshi; Otsuka, Kaoru; Omori, Takazumi; Suzuki, Yumi*; Tanaka, Atsushi*; Kawakami, Tomohiko*; Ide, Hiroshi; Tsuchiya, Kunihiko

no journal, , 

no abstracts in English

Oral presentation

Study on measurement technique for ZrBx composition and hardness based on Laser Induced Breakdown Spectroscopy (LIBS), 1; Preliminary consideration of measuring conditions

Abe, Yuta; Otaka, Masahiko; Okazaki, Kodai*; Kawakami, Tomohiko*; Oishi, Yuji*

no journal, , 

no abstracts in English

Oral presentation

Study on measurement technique for ZrBx composition and hardness based on Laser Induced Breakdown Spectroscopy (LIBS), 2; Measurement characteristic on different composite specimens

Okazaki, Kodai*; Kawakami, Tomohiko*; Abe, Yuta; Otaka, Masahiko; Oishi, Yuji*

no journal, , 

no abstracts in English

Oral presentation

Applicability of metal boride hardness measurement using Laser-Induced Breakdown Spectroscopy (LIBS), 1; Simultaneous measuring of elemental composition information and hardness

Makuuchi, Etsuyo*; Nagayama, Sakiko*; Abe, Yuta; Okazaki, Kodai*; Kawakami, Tomohiko*; Oishi, Yuji*; Otaka, Masahiko

no journal, , 

no abstracts in English

Oral presentation

Applicability of metal boride hardness measurement using Laser-Induced Breakdown Spectroscopy (LIBS), 2; Element distribution of metal boride specimens with complicated composition

Okazaki, Kodai*; Kawakami, Tomohiko*; Nagayama, Sakiko*; Abe, Yuta; Otaka, Masahiko; Makuuchi, Etsuyo*; Oishi, Yuji*; Takagai, Yoshitaka*

no journal, , 

no abstracts in English

Oral presentation

Development of material hardness evaluation method by simultaneous multi-spectrum measurement of Laser Induced Breakdown Spectroscopy (LIBS), 1; Examination of in-situ hardness measurement method for metal boride

Abe, Yuta; Makuuchi, Etsuyo*; Nagayama, Sakiko*; Okazaki, Kodai*; Kawakami, Tomohiko*; Sun, Y.*; Oishi, Yuji*; Otaka, Masahiko

no journal, , 

no abstracts in English

Oral presentation

Development of material hardness evaluation method by simultaneous multi-spectrum measurement of Laser Induced Breakdown Spectroscopy (LIBS), 2; Examination of composition distribution method using multivariate analysis

Nagayama, Sakiko*; Okazaki, Kodai*; Kawakami, Tomohiko*; Abe, Yuta; Makuuchi, Etsuyo*; Otaka, Masahiko

no journal, , 

no abstracts in English

Oral presentation

Using CO$$_{2}$$ reaction to achieve mass-spectrometric discrimination for Pu isotopic analysis with inductively coupled plasma-mass spectrometry

Matsueda, Makoto; Kawakami, Tomohiko*; Koarai, Kazuma; Terashima, Motoki; Fujiwara, Kenso; Iijima, Kazuki; Furukawa, Makoto*; Takagai, Yoshitaka*

no journal, , 

Inductively coupled plasma tandem mass spectrometry with CO$$_{2}$$ gas reactions in a dynamic reaction cell almost eliminated the background noise intensity produced by isobaric interference from isotopes originating from actinides such as Am, Cm, and U at the locations (m/z) of significant Pu isotopes ($$^{239}$$Pu, $$^{240}$$Pu, $$^{241}$$Pu, $$^{242}$$Pu, and $$^{244}$$Pu).

Oral presentation

Examination of measurement method of the hardness by Laser Induced Breakdown Spectroscopy (LIBS) and multivariate analysis

Okazaki, Kodai*; Kawakami, Tomohiko*; Nagayama, Sakiko*; Abe, Yuta; Makuuchi, Etsuyo*; Otaka, Masahiko; Oishi, Yuji*

no journal, , 

no abstracts in English

28 (Records 1-20 displayed on this page)