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Journal Articles

K-Ar ages of an andesitic parallel dike swarm in the Takane area, Takayama City, Gifu Prefecture, Central Japan

Niwa, Masakazu; Ueki, Tadamasa*; Hoshi, Hiroyuki*; Sugisaki, Yuichi*; Yagi, Koshi*; Tozawa, Terumasa

Chishitsugaku Zasshi, 126(9), p.543 - 548, 2020/09

A large number of paleomagnetic and chronological studies have contributed to the elucidation of the early Miocene clockwise rotation of Southwest Japan associated with the major opening of back-arc basins of the Japan Sea. Paleomagnetic data from an andesitic parallel dike swarm in the Takane area, Takayama City, Gifu Prefecture, Central Japan, were previously reported, showing the easterly deflection of the observed magnetization direction compared to an early Miocene expected paleomagnetic direction. This must represent the clockwise rotation during the opening of the Japan Sea, if the dike swarm was intruded before the opening event. Here, we report new K-Ar hornblende ages from an andesite dike of the dike swarm. These ages are statistically indistinguishable, indicating emplacement of the dike swarm before the clockwise rotation.

JAEA Reports

Study on sample description, composition, and preparation for dating of altered volcanic rocks

Niwa, Masakazu; Ueki, Tadamasa*; Hoshi, Hiroyuki*; Sugisaki, Yuichi*

JAEA-Research 2020-003, 33 Pages, 2020/07

JAEA-Research-2020-003.pdf:5.69MB

Ages of volcanic rocks are helpful information to understand the impact of volcanism concerning a site characterization and a safety assessment for geological disposal. In this study, mineralogical and geochemical data of altered volcanic rocks were collected using a polarizing microscope, X-ray diffractometer, X-ray fluorescence spectrometer, X-ray analytical microscope, and electron probe microanalyzer, to select targets suitable for reliable K-Ar dating. In addition, sample preparation procedures such as freeze-thawing and HCl treatment were examined to concentrate unaltered plagioclase which is one of major phenocrysts in volcanic rocks. These data and procedures were compiled in this report.

JAEA Reports

Analysis of the radioactivity concentrations in low-level radioactive waste generated from JPDR facilities, 4

Omori, Hiroyuki; Nebashi, Koji; Shimada, Asako; Tanaka, Kiwamu; Yasuda, Mari; Hoshi, Akiko; Tsuji, Tomoyuki; Ishimori, Kenichiro; Kameo, Yutaka

JAEA-Data/Code 2014-029, 31 Pages, 2015/03

JAEA-Data-Code-2014-029.pdf:1.51MB

Simple and rapid methods to evaluate the radioactivity concentrations are required for the radioactive waste generated from research facilities in the Japan Atomic Energy Agency to dispose of in a near-surface repository. In order to establish the methods to evaluate the radioactivity concentrations of miscellaneous solid waste generated from research and testing reactors, we collected and analyzed samples from miscellaneous solid waste generated by the decommissioning of JPDR (Japan Power Demonstration Reactor). In this report, we reported the analytical data determined in fiscal 2014 ($$^{137}$$Cs and $$^{93}$$Mo) and summarized them with the radioactivity concentrations obtained in the past as basic data to consider the evaluation method of radioactivity concentrations in the stored waste taken from JPDR.

Journal Articles

Assembly study for JT-60SA tokamak

Shibanuma, Kiyoshi; Arai, Takashi; Hasegawa, Koichi; Hoshi, Ryo; Kamiya, Koji; Kawashima, Hisato; Kubo, Hirotaka; Masaki, Kei; Saeki, Hisashi; Sakurai, Shinji; et al.

Fusion Engineering and Design, 88(6-8), p.705 - 710, 2013/10

 Times Cited Count:8 Percentile:59.34(Nuclear Science & Technology)

Journal Articles

Thermal analysis and Ohmic loss estimation of polarizer for ITER ECCD system

Saigusa, Mikio*; Takahashi, Koji; Kashiwa, Yoshinori*; Oishi, Shimpei*; Hoshi, Yuki*; Nakahata, Hiroyuki*; Kasugai, Atsushi; Sakamoto, Keishi; Imai, Tsuyoshi*

Fusion Engineering and Design, 74(1-4), p.473 - 478, 2005/11

 Times Cited Count:4 Percentile:25.79(Nuclear Science & Technology)

The specification of an electron cyclotron current driving (ECCD) system in International Thermonuclear Experimental Reactor (ITER) demands severe operational conditions for transmission lines and polarizers. For evaluating Ohmic loss of a miter bend type polarizer, the six polarizers were made of chromium copper alloy, installed in miter bends and tested at a frequency of 170GHz, rf power of 441kW and pulse duration of 0.1-6 seconds. The increase in temperature on the back of the grooved mirrors has been measured with thermo couplers during high power rf pulses. The Ohmic loss of grooved mirrors strongly depends on the rotation angle of the polarization plane of the incident waves and the mirror rotation in high power experiments, for example the Ohmic loss distributed from 0.2% to1.6%. The thermal analysis of grooved mirror has been performed with the 3D FEM code: FEVA. The all strange behavior of Ohmic loss of polarizers could be explained, theoretically.

Journal Articles

Prompt gamma-ray analysis using cold and thermal guided neutron beams at JAERI

Yonezawa, Chushiro; ; ; Hoshi, Michio; Sawahata, Hiroyuki*; Ito, Yasuo*

Proc. of 9th Int. Symp. on Capture Gamma-ray Spectroscopy and Related Topics, 0, p.705 - 712, 1997/00

no abstracts in English

Journal Articles

Application of neutron-induced prompt gamma-ray analysis for determination of B-10 in BNCT

Yonezawa, Chushiro; ; Sawahata, Hiroyuki*; *; Hoshi, Michio; Ito, Yasuo*

Cancer Neutron Capture Therapy, 0, p.221 - 225, 1996/00

no abstracts in English

Journal Articles

Application of neutron-induced prompt gamma-ray analysis for determination of $$^{10}$$B in BNCT

Yonezawa, Chushiro; ; Sawahata, Hiroyuki*; *; Hoshi, Michio; Ito, Yasuo*

KURRI-TR-413, 0, p.21 - 27, 1995/00

no abstracts in English

JAEA Reports

None

; ; ; Hoshi, Takashi*; Kusunoki, Hiroyuki*; Hamada, Masao*

PNC TY9471 94-002, 48 Pages, 1994/03

PNC-TY9471-94-002.pdf:2.34MB

None

JAEA Reports

None

; ; ; Hoshi, Takashi*; Kusunoki, Hiroyuki*; Hamada, Masao*

PNC TY9471 94-001, 539 Pages, 1994/03

PNC-TY9471-94-001.pdf:21.45MB

None

Oral presentation

Effect of ion beam irradiation on character in lily

Kondo, Masayoshi*; Koike, Yosuke*; Okuhara, Hiroyuki*; Kobayashi, Hitoshi*; Hoshi, Yosuke*; Nomizu, Toshikazu*; Yoshihara, Ryohei; Hase, Yoshihiro

no journal, , 

no abstracts in English

Oral presentation

Study of JT-60SA assembly procedure

Arai, Takashi; Hasegawa, Koichi; Hoshi, Ryo; Kawashima, Hisato; Kubo, Hirotaka; Masaki, Kei; Sawai, Hiroaki; Shibanuma, Kiyoshi; Tsukao, Naohiro; Yagyu, Junichi; et al.

no journal, , 

In a JT-60SA project, JT-60U is repaired to superconductivity tokamak JT-60 SA as a satellite tokamak plan by "broad approach (BA) activities towards realization of the early stage of nuclear fusion energy" who carries out by Japan-Europe cooperation. JT-60SA is built in the torus hall of a JT-60 experiment building main part after demolition of JT-60U equipment. In JT-60 SA, arrangement examination and an interference check are performed about the apparatus of the structure which becomes intricate intricately using a 3D-CAD model. A plan for the three-dimensional measuring instrument (laser tracker) which is leading-edge technology to perform position measurement is carried out. The laser tracker is highly precise as compared with the usual measuring instrument, and can make a fabrication error small as much as possible. A lecture describes position measurement together with an assembly procedure.

Oral presentation

Radiometric ages and petrographic properties of the Oroshi volcanic ash in the lower Tokai Group

Hoshi, Hiroyuki*; Tamura, Itoko; Komatsu, Tetsuya

no journal, , 

no abstracts in English

Oral presentation

Eye lens dosimetry for workers at Fukushima Daiichi Nuclear Power Station, 1; Outline of the research and results of dose measurement for the workers

Yokoyama, Sumi*; Ezaki, Iwao*; Aoki, Katsunori; Tatsuzaki, Hideo*; Hirao, Kazushige*; Tachiki, Shuichi*; Yoshitomi, Hiroshi; Hoshi, Katsuya; Tanimura, Yoshihiko; Oguchi, Hiroyuki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Eye lens dosimetry for workers at Fukushima Daiichi Nuclear Power Station, 2; Summary of personal dose measurement and dosimeter comparison

Ezaki, Iwao*; Aoki, Katsunori; Tatsuzaki, Hideo*; Tachiki, Shuichi*; Hirao, Kazushige*; Yoshitomi, Hiroshi; Hoshi, Katsuya; Tanimura, Yoshihiko; Oguchi, Hiroyuki*; Tsujimura, Norio; et al.

no journal, , 

no abstracts in English

15 (Records 1-15 displayed on this page)
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