Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Miura, Hikaru*; Kuribara, Yuichi; Yamamoto, Masayoshi*; Sakaguchi, Aya*; Yamaguchi, Noriko*; Sekizawa, Oki*; Nitta, Kiyofumi*; Higaki, Shogo*; Tsumune, Daisuke*; Itai, Takaaki*; et al.
Scientific Reports (Internet), 10, p.11421_1 - 11421_9, 2020/07
Times Cited Count：18 Percentile：68.95(Multidisciplinary Sciences)
pre-concentration of Sr from large volume of freshwater sample using Powdex resinTomita, Jumpei; Yamamoto, Masayoshi*; Nozaki, Teo; Tanimura, Yoshihiko*; Oishi, Tetsuya
Journal of Environmental Radioactivity, 146, p.88 - 93, 2015/08
Times Cited Count：12 Percentile：35.16(Environmental Sciences)Yamamoto, Masayoshi*; Tomita, Jumpei
Onsen Kagaku, 64(4), p.388 - 401, 2015/03
no abstracts in English
Yoshimura, Kazuya; Onda, Yuichi*; Sakaguchi, Aya*; Yamamoto, Masayoshi*; Matsuura, Yuki*
Journal of Environmental Radioactivity, 139, p.370 - 378, 2015/01
Times Cited Count：86 Percentile：92.19(Environmental Sciences)
Mn
)O
Shinoda, Ryoichi*; Ito, Masayoshi*; Sakurai, Yoshiharu*; Yamamoto, Hiroyuki; Hirao, Norie; Baba, Yuji; Iwase, Akihiro*; Matsui, Toshiyuki*
Journal of Applied Physics, 113(17), p.17E307_1 - 17E307_3, 2013/05
Times Cited Count：9 Percentile：37.98(Physics, Applied)We revealed that the Ba(CoMn)O (BCMO) ceramic samples exhibited ferromagnetic-dielectric behavior below the magnetic transition temperature of about 35 K. The origin of their magnetic ordering was expected to super-exchange coupling of Co
(
)-O
-Mn (
) with bonding angle of 180
. and/or Mn()-O-Mn () with bonding angle of 90. The magnetic spin momentum estimated by the magnetic Compton profiles (MCP) of the samples had similar temperature dependence as that determined by the SQUID measurement, which meant that the observed magnetic moments could be ascribed to the spin moment. The shapes of the MCPs of the samples were completely same regardless of the temperature measured. This result indicates that there are no changes of the momentum space distribution of spin density between ferromagnetic and paramagnetic states. So, this magnetic transition is simply caused by a thermal fluctuation of the spin.
Katagiri, Hiromi; Okuno, Hiroshi; Sawahata, Masayoshi; Ikeda, Takeshi; Sato, Sohei; Terakado, Naoya; Nagakura, Tomohiro; Nakanishi, Chika; Fukumoto, Masahiro; Yamamoto, Kazuya; et al.
JAEA-Review 2011-037, 66 Pages, 2011/12
JAEA-Review-2011-037.pdf:4.52MB
When a Nuclear emergency occurs, Nuclear Emergency Assistance & Training Center (NEAT) of JAEA gives technical advice and information, dispatch specialists as required, supplies emergency equipment and materials to the National Government and local governments. NEAT provides various lectures and training courses concerning nuclear disaster prevention for those personnel taking an active part in emergency response organizations at normal time. NEAT also researches on nuclear disaster prevention and cooperates with international organizations. Concerning about the assistance to the Accident of Fukushima No.1 Nuclear Power Station caused by the Great East Japan Earthquake at 11 March, 2011, JAEA assisted activities including environmental radiation monitoring, environmental radioactivity analyses, resident public consulting etc., with its full scale effort. NEAT served as the center of these supporting activities of JAEA.
Mikake, Shinichiro; Yamamoto, Masaru; Ikeda, Koki; Sugihara, Kozo; Takeuchi, Shinji; Hayano, Akira; Sato, Toshinori; Takeda, Shinichi; Ishii, Yoji; Ishida, Hideaki; et al.
JAEA-Technology 2010-026, 146 Pages, 2010/08
JAEA-Technology-2010-026.pdf:41.08MB
JAEA-Technology-2010-026-appendix(CD-ROM).zip:83.37MB
The Mizunami Underground Research Laboratory (MIU), one of the main facilities in Japan for research and development of the technology for high-level radioactive waste disposal, is under construction in Mizunami City. In planning the construction, it was necessary to get reliable information on the bedrock conditions, specifically the rock mass stability and hydrogeology. Therefore, borehole investigations were conducted before excavations started. The results indicated that large water inflow could be expected during the excavation around the Ventilation Shaft at GL-200m and GL-300m Access/Research Gallery. In order to reduce water inflow, pre-excavation grouting was conducted before excavation of shafts and research tunnels. Grouting is the injection of material such as cement into a rock mass to stabilize and seal the rock. This report describes the knowledge and lessons learned during the planning and conducting of pre-excavation grouting.
Endo, Satoru*; Tomita, Jumpei*; Tanaka, Kenichi*; Yamamoto, Masayoshi*; Fukutani, Satoshi*; Imanaka, Tetsuji*; Sakaguchi, Aya*; Amano, Hikaru; Kawamura, Hidehisa*; Kawamura, Hisao*; et al.
Radiation and Environmental Biophysics, 47(3), p.359 - 365, 2008/07
Times Cited Count：5 Percentile：21.04(Biology)Dolon village located about 60 km from the border of the Semipalatinsk Nuclear Test Site is known to be heavily contaminated by the first USSR atomic bomb test in August 1949. Soil samples around Dolon were taken in October 2005 in an attempt to evaluate internal thyroid dose arising from incorporation of radioiodine isotopes (mainly 
I). Iodine-129 in soil was measured by using the technique of Accelerator Mass Spectrometry. From the relationship between 
I and 
Cs (corrected for background and decay from 1949 to 2005) accumulated levels, the background level of I and the I/Cs ratio around Dolon were estimated to be (6.4 
0.4) 
10
atoms m
and 0.25 0.16, respectively. This I/Cs ratio is almost similar to the fission yield ratio for 
Pu fast fission (0.24).
Shima, Shigeki*; Gasa, Shinichi*; Amano, Hikaru; Nagao, Seiya*; Yamamoto, Masayoshi*; Momoshima, Noriyuki*; Furukawa, Masahide*; Kimura, Hideki*; Kawamura, Hisao*
JAEA-Conf 2008-003, p.28 - 31, 2008/04
Concentrations of I in surface seawater around Japan were approximately 210
atoms/L in literatures. However, the atomic ratio of iodine to cesium was ten times as high as that of the global fallout. The origin of I in the water columns seems to be difficult to be explained by only the global fallout. Discharge from European plants was one of the possible origins of iodine from the standpoint of air mass trajectory analysis. Concentration of I in rain water was 10 times higher than that in surface seawater. Anthropogenic inorganic iodine in surface seawater predominantly dissolves as an iodide ion (I
).
Wakai, Eiichi; Matsukawa, Shingo; Yamamoto, Toshio*; Kato, Yoshiaki; Takada, Fumiki; Sugimoto, Masayoshi; Jitsukawa, Shiro
Materials Transactions, 45(8), p.2641 - 2643, 2004/08
Times Cited Count：6 Percentile：41.12(Materials Science, Multidisciplinary)no abstracts in English
Iwamura, Takamichi; Okubo, Tsutomu; Akie, Hiroshi; Kugo, Teruhiko; Yonomoto, Taisuke; Kureta, Masatoshi; Ishikawa, Nobuyuki; Nagaya, Yasunobu; Araya, Fumimasa; Okajima, Shigeaki; et al.
JAERI-Research 2004-008, 383 Pages, 2004/06
JAERI-Research-2004-008.pdf:21.49MB
The present report contains the achievement of "Research and Development on Reduced-Moderation Light Water Reactor with Passive Safety Features", which was performed by Japan Atomic Energy Research Institute (JAERI), Hitachi Ltd., Japan Atomic Power Company and Tokyo Institute of Technology in FY2000-2002 as the innovative and viable nuclear energy technology (IVNET) development project operated by the Institute of Applied Energy (IAE). In the present project, the reduced-moderation water reactor (RMWR) has been developed to ensure sustainable energy supply and to solve the recent problems of nuclear power and nuclear fuel cycle, such as economical competitiveness, effective use of plutonium and reduction of spent fuel storage. The RMWR can attain the favorable characteristics such as high burnup, long operation cycle, multiple recycling of plutonium (Pu) and effective utilization of uranium resources based on accumulated LWR technologies.
Tsuzuki, Kazuhiro; Kimura, Haruyuki; Kawashima, Hisato; Sato, Masayasu; Kamiya, Kensaku; Shinohara, Koji; Ogawa, Hiroaki; Hoshino, Katsumichi; Bakhtiari, M.; Kasai, Satoshi; et al.
Nuclear Fusion, 43(10), p.1288 - 1293, 2003/10
Times Cited Count：39 Percentile：74.23(Physics, Fluids & Plasmas)no abstracts in English
Yamamoto, Takuya*; Shimo, Michito*; Fujiwara, Yasushi*; Hattori, Hiromichi*; Nago, Makito*; Tadokoro, Teruo*; Kuji, Masayoshi*
JNC TJ5420 2004-005, 855 Pages, 2003/03
JNC-TJ5420-2004-005.pdf:76.83MBJNC-TJ5420-2004-005(errata).pdf:0.08MB
Three 520m deep boreholes were drilled at Horonobe Town, Teshio District, Hokkaido in order to investigate the characteristics of deep sedimentary rock in the Horonobe Underground Research Program. The results of the investigations were applied to the model construction and to the numerical analysis. The model consists of geological, mechanical, hydrological and geo-chemical characteristics. This report summarizes the results of the boring and investigations of HDB-5 (Horonobe Deep Borehole #5).
Nagao, Seiya; Yanase, Nobuyuki; Yamamoto, Masayoshi*; Kofuji, H.*; Sorin, Yoshiki*; Amano, Hikaru
Journal of Radioanalytical and Nuclear Chemistry, 252(2), p.225 - 232, 2002/05
Times Cited Count：9 Percentile：51.46(Chemistry, Analytical)no abstracts in English
Shimomura, Yasuo; Tsunematsu, Toshihide; Yamamoto, Shin; Maruyama, So; Mizoguchi, Tadanori*; Takahashi, Yoshikazu; Yoshida, Kiyoshi; Kitamura, Kazunori*; Ioki, Kimihiro*; Inoue, Takashi; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 78(Suppl.), 224 Pages, 2002/01
no abstracts in English
Sakai, Akihiro; Yoshimori, Michiro; Okoshi, Minoru; Yamamoto, Tadatoshi; Abe, Masayoshi
JAERI-Tech 2001-018, 88 Pages, 2001/03
JAERI-Tech-2001-018.pdf:5.66MB
no abstracts in English
Ogawa, Toshihide; Ogawa, Hiroaki; Miura, Yukitoshi; Niimi, Hironobu*; Kimura, Haruyuki; Kashiwa, Yoshitoshi; Shibata, Takatoshi; Yamamoto, Masahiro; Fukumoto, Naoyuki*; Nagata, Masayoshi*; et al.
Journal of Nuclear Materials, 290-293, p.454 - 458, 2001/03
Times Cited Count：7 Percentile：48.68(Materials Science, Multidisciplinary)no abstracts in English
Suzaki, Takenori; Kurosawa, Masayoshi; Hirose, Hideyuki; Yamamoto, Toshihiro; Nakajima, Ken; ; *; *
ICNC 95: 5th Int. Conf. on Nuclear Criticality Safety, Vol. I, 0, p.1B.11 - 1B.18, 1995/00
no abstracts in English
Nakamura, Hiroo; Tobita, Kenji; Hirayama, Toshio; Koide, Yoshihiko; Arai, Takashi; Kuriyama, Masaaki; Kubo, Hirotaka; Kusama, Yoshinori; Sugie, Tatsuo; Sugihara, Masayoshi; et al.
Fusion Technology, 18, p.578 - 582, 1990/12
no abstracts in English
Hitoki, Shigehisa*; Sugihara, Masayoshi; Yamamoto, Shin
Japanese Journal of Applied Physics, 27(7), p.1291 - 1298, 1988/07
Times Cited Count：0 Percentile：0.01(Physics, Applied)no abstracts in English
