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Journal Articles

Summary results of subsidy program for the "Project of Decommissioning and Contaminated Water Management (Development of Analysis and Estimation Technology for Characterization of Fuel Debris (Development of Technologies for Enhanced Analysis Accuracy and Thermal Behavior Estimation of Fuel Debris))"

Koyama, Shinichi; Nakagiri, Toshio; Osaka, Masahiko; Yoshida, Hiroyuki; Kurata, Masaki; Ikeuchi, Hirotomo; Maeda, Koji; Sasaki, Shinji; Onishi, Takashi; Takano, Masahide; et al.

Hairo, Osensui Taisaku jigyo jimukyoku Homu Peji (Internet), 144 Pages, 2021/08

JAEA performed the subsidy program for the "Project of Decommissioning and Contaminated Water Management (Development of Analysis and Estimation Technology for Characterization of Fuel Debris (Development of Technologies for Enhanced Analysis Accuracy and Thermal Behavior Estimation of Fuel Debris))" in 2020JFY. This presentation summarized briefly the results of the project, which will be available shortly on the website of Management Office for the Project of Decommissioning and Contaminated Water Management.

Journal Articles

Manipulation of saturation magnetization and perpendicular magnetic anisotropy in epitaxial Co$$_{x}$$Mn$$_{4-x}$$N films with ferrimagnetic compensation

Ito, Keita*; Yasutomi, Yoko*; Zhu, S.*; Nurmamat, M.*; Tahara, Masaki*; Toko, Kaoru*; Akiyama, Ryota*; Takeda, Yukiharu; Saito, Yuji; Oguchi, Tamio*; et al.

Physical Review B, 101(10), p.104401_1 - 104401_8, 2020/03

 Times Cited Count:3 Percentile:44.66(Materials Science, Multidisciplinary)

JAEA Reports

Measurement and analysis of in-vessel component activation and gamma dose rate distribution in Joyo

Ito, Hideaki; Maeda, Shigetaka; Naito, Hiroyuki; Akiyama, Yoichi; Miyamoto, Kazuyuki; Ashida, Takashi; Noguchi, Koichi; Ito, Chikara; Aoyama, Takafumi

JAEA-Technology 2010-049, 129 Pages, 2011/03

JAEA-Technology-2010-049.pdf:6.99MB

The in-vessel gamma dose rate was measured in the experimental fast reactor Joyo to evaluate the activation of reactor structural components and the radiation exposure of the fiber scope used for in-vessel visual inspection. The measurement system, which requires a wide sensitivity range and high durability in a high-temperature environment, was specifically developed for use in the sodium cooled fast reactor. Using this system, the in-vessel gamma dose rate with cooling times of 450 and 720 days after reactor shutdown was measured in Joyo, which has been operated for 71,000 hours over approximately 30 years. The gamma dose rate was calculated using QAD-CGGP2 code with the gamma source intensity obtained by the ORIGEN2 code. The neutron flux used as input to the ORIGEN2 was evaluated by the Joyo dosimetry method. The ratio between the calculated and experimental values ranged from 1.1 to 2.4, confirming the accuracy of gamma dose rate and component activation calculation.

Journal Articles

Adsorption of Nb, Ta and Pa on anion-exchanger in HF and HF/HNO$$_{3}$$ solutions; Model experiments for the chemical study of Db

Kasamatsu, Yoshitaka; Toyoshima, Atsushi; Haba, Hiromitsu*; Tome, Hayato*; Tsukada, Kazuaki; Akiyama, Kazuhiko*; Yoshimura, Takashi*; Nagame, Yuichiro

Journal of Radioanalytical and Nuclear Chemistry, 279(2), p.371 - 376, 2009/02

 Times Cited Count:11 Percentile:63.13(Chemistry, Analytical)

Anion-exchange behavior of the group-5 elements Nb and Ta, and their pseudo homologue Pa in HF and HF/HNO$$_{3}$$ solutions was investigated by a batch method to find suitable conditions for the anion-exchange experiment of element 105 (Dubnium, Db). We determined distribution coefficients of those elements on the anion-exchange resin as a function of the F$$^{-}$$ and NO$$_{3}$$$$^{-}$$ concentrations. Clearly different anion-exchange behavior was observed among these elements. Based on the results, we discuss the fluoro-complex formation of each element and suggest experimental conditions for the study of fluoride complexation of Db.

Journal Articles

The H-Invitational Database (H-InvDB); A Comprehensive annotation resource for human genes and transcripts

Yamasaki, Chisato*; Murakami, Katsuhiko*; Fujii, Yasuyuki*; Sato, Yoshiharu*; Harada, Erimi*; Takeda, Junichi*; Taniya, Takayuki*; Sakate, Ryuichi*; Kikugawa, Shingo*; Shimada, Makoto*; et al.

Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01

 Times Cited Count:51 Percentile:74.53(Biochemistry & Molecular Biology)

Here we report the new features and improvements in our latest release of the H-Invitational Database, a comprehensive annotation resource for human genes and transcripts. H-InvDB, originally developed as an integrated database of the human transcriptome based on extensive annotation of large sets of fulllength cDNA (FLcDNA) clones, now provides annotation for 120 558 human mRNAs extracted from the International Nucleotide Sequence Databases (INSD), in addition to 54 978 human FLcDNAs, in the latest release H-InvDB. We mapped those human transcripts onto the human genome sequences (NCBI build 36.1) and determined 34 699 human gene clusters, which could define 34 057 protein-coding and 642 non-protein-coding loci; 858 transcribed loci overlapped with predicted pseudogenes.

Journal Articles

Startup of superheavy element chemistry at RIKEN

Haba, Hiromitsu*; Akiyama, Takahiro*; Kaji, Daiya*; Kikunaga, Hidetoshi*; Kuribayashi, Takahiro*; Morimoto, Koji*; Morita, Kosuke*; Oe, Kazuhiro*; Sato, Nozomi*; Shinohara, Atsushi*; et al.

European Physical Journal D, 45(1), p.81 - 86, 2007/10

 Times Cited Count:10 Percentile:48.86(Optics)

A review is given on the startup of the superheavy element (SHE) chemistry at RIKEN. A gas-jet transport system for the SHE chemistry has been coupled to the gas-filled recoil ion separator GARIS at the RIKEN Linear Accelerator. The performance of the system was appraised using $$^{206}$$Fr and $$^{245}$$Fm produced in the $$^{169}$$Tm($$^{40}$$Ar,3${it n}$)$$^{206}$$Fr and $$^{208}$$Pb($$^{40}$$Ar,3${it n}$)$$^{245}$$Fm reactions, respectively. The $$alpha$$ particles of $$^{206}$$Fr and $$^{245}$$Fm separated with GARIS and transported by the gas-jet were identified with a rotating wheel system for $$alpha$$ spectrometry under desired low background condition. The high gas-jet efficiencies over 80% were independent of the beam intensities up to 2 particle $$mu$$A. A gas-jet coupled target system for the production of SHEs was also installed on the beam line of the RIKEN K70 AVF cyclotron. The gas-jet transport of $$^{255}$$No and $$^{261}$$Rf produced in the $$^{238}$$U($$^{22}$$Ne,5${it n}$)$$^{255}$$No and $$^{248}$$Cm($$^{18}$$O,5${it n}$)$$^{261}$$Rf reactions, respectively, was conducted for the future chemical studies of $$^{265}$$Sg via the $$^{248}$$Cm($$^{22}$$Ne, 5${it n}$)$$^{265}$$Sg reaction.

Journal Articles

Studies of fast-ion transport induced by energetic particle modes using fast-particle diagnostics with high time resolution in CHS

Isobe, Mitsutaka*; Toi, Kazuo*; Matsushita, Hiroyuki*; Goto, Kazuyuki*; Suzuki, Chihiro*; Nagaoka, Kenichi*; Nakajima, Noriyoshi*; Yamamoto, Satoshi*; Murakami, Sadayoshi*; Shimizu, Akihiro*; et al.

Nuclear Fusion, 46(10), p.S918 - S925, 2006/10

 Times Cited Count:27 Percentile:69.39(Physics, Fluids & Plasmas)

no abstracts in English

JAEA Reports

Radiation control in Naka Fusion Research Establishment

Umehara, Takashi; Tayama, Toru; Akiyama, Isamu; Nagata, Yasushi*; Onodera, Satoru*

JAERI-Review 2004-019, 109 Pages, 2004/08

JAERI-Review-2004-019.pdf:10.84MB

This report has been written about the outline of the JT-60 related facility, the JT-60 gaseous waste treatment facility, radiation control equipments and a fundamental radiation control form, which are needed to carry out a radiation control by radiation control officer in Naka Fusion Research Establishment. Further, the following items has been arranged to tables; the low and in-house rules of a radiation protection to apply for the JT-60 facilities, specifications of the JT-60, main parameters and performance of the JT-60, a radiation generated by the JT-60 plasma discharge test, an permitted amount of radiation source and nuclear fuel, each performance of the radiation generators, specifications of the air exhaust facility and the radiation control facility. In addition, figures of the control area, system diagrams of the gaseous waste treatment facility and radiation control monitors are attached.

Journal Articles

Impurity desorption behavior from low activation ferritic steel installed in the JFT-2M tokamak

Tsuzuki, Kazuhiro; Sato, Masayasu; Kawashima, Hisato; Ogawa, Hiroaki; Kimura, Haruyuki; Okano, Fuminori; Suzuki, Sadaaki; Komata, Masao; Sawahata, Masayuki; Shinohara, Koji; et al.

Journal of Nuclear Materials, 313-316, p.177 - 181, 2003/03

 Times Cited Count:9 Percentile:55.15(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Testing for compatibility of reduced activation ferritic steel with plasma on JFT-2M; Partial coverage of the vacuum vessel with ferritic steel

Tsuzuki, Kazuhiro; Isei, Nobuaki; Kawashima, Hisato; Sato, Masayasu; Kimura, Haruyuki; Ogawa, Hiroaki; Miura, Yukitoshi; Ogawa, Toshihide; Shibata, Takatoshi; Akiyama, Takashi*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 78(5), p.455 - 461, 2002/05

no abstracts in English

Journal Articles

Advanced material tokamak experiment (AMTEX) on JFT-2M; Design, fabrication, installation and conditioning of inside ferritic steel wall

Shibata, Takatoshi; Akiyama, Takashi*; Isei, Nobuaki; Kawashima, Hisato; Kimura, Haruyuki; Miyachi, Kengo; Okano, Fuminori; Sato, Masayasu; Suzuki, Sadaaki; Tsuzuki, Kazuhiro; et al.

Proceedings of 19th IEEE/NPSS Symposium on Fusion Engineering (SOFE), p.360 - 363, 2002/00

no abstracts in English

Journal Articles

Progress of advanced material tokamak experiment (AMTEX) program on JFT-2M

Kimura, Haruyuki; Sato, Masayasu; Kawashima, Hisato; Isei, Nobuaki; Tsuzuki, Kazuhiro; Ogawa, Hiroaki; Ogawa, Toshihide; Miura, Yukitoshi; Yamamoto, Masahiro; Shibata, Takatoshi; et al.

Fusion Engineering and Design, 56-57, p.837 - 841, 2001/10

 Times Cited Count:14 Percentile:70.96(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Design and first experimental results of toroidal field ripple reduction using ferritic insertion in JFT-2M

Sato, Masayasu; Kawashima, Hisato; Miura, Yukitoshi; Tsuzuki, Kazuhiro; Kimura, Haruyuki; Uehara, Kazuya; Ogawa, Toshihide; Isei, Nobuaki; Tani, Takashi; Akiyama, Takashi*; et al.

Fusion Engineering and Design, 51-52(Part.B), p.1071 - 1076, 2000/11

 Times Cited Count:15 Percentile:70.2(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Ripple reduction and surface coating tests with ferritic steel on JFT-2M

Tsuzuki, Kazuhiro; Sato, Masayasu; Kawashima, Hisato; Miura, Yukitoshi; Kimura, Haruyuki; Abe, Tetsuya; Uehara, Kazuya; Ogawa, Toshihide; Akiyama, Takashi*; Shibata, Takatoshi; et al.

Journal of Nuclear Materials, 283-287, p.681 - 684, 2000/00

 Times Cited Count:12 Percentile:63.79(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

A Mechanical design for ferritic steels to reduce toroidal field ripple in the JFT-2M

Nakayama, Takeshi*; Yamamoto, Masahiro; Abe, Mitsushi*; Shibata, Takatoshi; Otsuka, Michio*; Akiyama, Takashi*; Sato, K.*; Kikuchi, Kazuo; Wada, Y.*; Koike, Tsuneyuki; et al.

Proceedings of the 18th IEEE/NPSS Symposium on Fusion Engineering (SOFE '99), p.227 - 230, 1999/10

no abstracts in English

Journal Articles

Advanced material tokamak experiment (AMTEX) program with ferritic steel for JFT-2M

Sato, Masayasu; Miura, Yukitoshi; Kimura, Haruyuki; Kawashima, Hisato; Sengoku, Seio; Yamamoto, Masahiro; ; Shibata, Takatoshi; Akiyama, Takashi*; Abe, Mitsushi*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 75(6), p.741 - 749, 1999/06

no abstracts in English

Journal Articles

Modifications and operational experience of JT-60 power supplies

; ; ; ; ; Yagyu, Junichi; ; Miyachi, Kengo; *; ; et al.

Fusion Technology 1988, p.1444 - 1448, 1989/00

no abstracts in English

Journal Articles

Modifications and operational experience of JT-60 power supplies

; ; ; ; ; Yagyu, Junichi; ; Miyachi, Kengo; *; ; et al.

Fusion Technology 1988, p.1444 - 1448, 1989/00

no abstracts in English

Oral presentation

Molecular microbiological approaches to understand biogeochemical processes in deep aquifers

Naganuma, Takashi; Iwatsuki, Teruki; Shimizu, Satoru*; Akiyama, Masaru*; Ishijima, Yoji*

no journal, , 

Microbial communities affect geochemical and hydrogeological processes in deep aquifers, and have been characterized mainly by genetic approaches as well as activity measurements. We have analyzed 16S rDNA assemblages from hydrologically isolated aquifers of porous-but-less-permeable strata in the northernmost part of Japan, and revealed distinctive microbial communities including methanogens and so-far-uncultured species. We have also collected 16S rDNA of the 0.2-micron m-passing-but-0.1-micron m-captured microorganisms from sedimentary and granite rock aquifers in a uranium deposit area of central Japan. In situ activities are characterized and measured by culture-based physiological approaches, which have many limitations and biases though. We have developed a quantification of mRNA for redox-responsive proteins of Fe(III)-reducing bacteria collected from a deep aquifer. This approach is applicable to other aquifer processes such as reduction of nitrate, sulfate, CO$$_{2}$$, etc.

Oral presentation

Study on optimization of protective clothing for radiation worker under high temperature and humidity circumstances to decrease body payload of radiation work

Unno, Motoyoshi; Ebashi, Tsutomu; Kawasaki, Takashi; Tomotsune, Yusuke; Akiyama, Kiyomitsu; Ejiri, Hideo; Kobayashi, Hirohide

no journal, , 

no abstracts in English

30 (Records 1-20 displayed on this page)