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Mukai, Hiroki*; Hirose, Atsushi*; Motai, Satoko*; Kikuchi, Ryosuke*; Tanoi, Keitaro*; Nakanishi, Tomoko*; Yaita, Tsuyoshi; Kogure, Toshihiro*
Scientific Reports (Internet), 6, p.21543_1 - 21543_7, 2016/02
Times Cited Count：133 Percentile：96.62(Multidisciplinary Sciences)Mukai, Hiroki*; Hatta, Tamao*; Kitazawa, Hideaki*; Yamada, Hirohisa*; Yaita, Tsuyoshi; Kogure, Toshihiro*
Environmental Science & Technology, 48(22), p.13053 - 13059, 2014/12
Times Cited Count：112 Percentile：94.42(Engineering, Environmental)no abstracts in English
Murakami, Takashi*; Isobe, Hiroshi; Sato, Tsutomu; Onuki, Toshihiko
Clays and Clay Minerals, 44(2), p.244 - 256, 1996/00
Times Cited Count：55 Percentile：84.43(Chemistry, Physical)no abstracts in English
*; Isobe, Hiroshi; *; *
Annual Report of the Institute of Geoscience,Univ. of Tsukuba,No. 21, p.9 - 13, 1995/12
no abstracts in English
Onuki, Toshihiko
Kobutsugaku Zasshi, 24(1), p.23 - 27, 1995/01
no abstracts in English
Yanase, Nobuyuki; T.E.Payne*; Sekine, Keiichi
Geochemical Journal, 29, p.31 - 54, 1995/00
Times Cited Count：23 Percentile：46.66(Geochemistry & Geophysics)no abstracts in English
Yanase, Nobuyuki; T.E.Payne*; Sekine, Keiichi
Geochemical Journal, 29, p.1 - 29, 1995/00
Times Cited Count：25 Percentile：49.47(Geochemistry & Geophysics)no abstracts in English
Isobe, Hiroshi; Onuki, Toshihiko; Murakami, Takashi*; F.G.Lafaye*
Materials Research Society Symposium Proceedings, Vol.353, 0, p.1211 - 1218, 1995/00
no abstracts in English
Isobe, Hiroshi; R.C.Ewing*; Murakami, Takashi*
Mater. Res. Soc. Symp. Proc. Vol. 333, 0, p.653 - 660, 1994/00
no abstracts in English
Tanaka, Tadao; K.Sriyotha*; Kamiyama, Hideo
JAERI-M 93-109, 16 Pages, 1993/05
no abstracts in English
Yusa, Yasuhisa; ; Arai, Takashi
PNC TN8410 91-007, 18 Pages, 1990/12
This paper contains an overview of analogue studies for the assessment of long-term durability of engineered barrier materials at PNC Tokai. Materials of young age and with simple history are the most suitable for study as: (1)properties of the materials tend to deteriorate over longer historical time intervals; and (2) detailed quantitative data on time intervals and environmental conditions are more likely to be available. The following materials and their alteration phenomena were selected: (1)weathering alteration of basaltic glass (as vitrified waste form), (2)corrosion of iron in soil (as overpack), (3)illitization of smectite associated with contact metamorphism (as buffer material), (4)alteration of cement (as buffer or backfill material). (1)Weathering alteration of basaltic glass: Basaltic g1asses, from the Fuji and the Izu-Ohshima pyroclastic fall deposits were studied. The observations were made: (a)Climatological conditions have not varied significantly during the last three thousand years. Therefore, values for temperature, amount, and chemistry of ground water are quantified. (b)The cases studied could be regarded as leaching experiments in groundwater, using mass balances in water-g1ass interaction. (c)Although the groundwater is of Ca(Mg)-HCO
type in the Fuji area and of Na-Cl type in the Izu-Ohshima, similar alteration ratios (2
3
m/1000yr) were obtained. (2)Corrosion of iron in soil: Industrial materials, such as gas/water service pipes of carbon steel or cast iron embedded in soil for 20 110 years, were selected for an analogue study of corrosion of iron in bentonite. The maximum corrosion rates obtained so far fall in the range of 0.040.09 mm/yr. (3)Illitization of smectite associated with contact metamorphism: In the Murakami bentonite deposit in central Japan, lateral variation of smectite to smectite/illite mixed-layer minerals are found in the aureole of the rhyolite intrusion body. Conversion of smectite to the
Okumura, Masahiko; Nakamura, Hiroki; Machida, Masahiko
no journal, ,
no abstracts in English
Suzuki, Seiya; Yano, Kimihiko; Watanabe, Masayuki; Koizumi, Kenji
no journal, ,
no abstracts in English
Yoshigoe, Akitaka
no journal, ,
A synchrotron radiation photoemission electron microscope (SR-PEEM) probing photoelectrons emitted from samples is an useful microscope with surface sensitive and nanoscale spatial resolution. The electron lens-system facilitates the enlargement and reduction of the sample image, and enables pinpoint chemical analysis by high energy resolution X-ray absorption spectroscopy (XAS). It has many advantages over scanning and transmission microscopes because it can observe samples without any preparations such as reduction of the sample thickness. In this talk, an application of SR-PEEM for elucidation of the adsorption states of radioactive Cs in clay minerals due to 1F accident will be shown. To overcome insulating properties of clay, an thin film was deposited on the sample surface. After this treatment. clear Cs map and pinpoint XAS spectra for Cs M-edge XAS for weathered biotite clay minerals with Cs were obtained to giving important findings on Cs adsorption mechanism. This method is expected to be applicable for not only the nuclear power researches, but also studies on nanotechnologies.
Tsuji, Takuya; Matsumura, Daiju; Kobayashi, Toru; Suzuki, Shinichi
no journal, ,
We observed adsorption structure of cesium in weathered biotite, illite and pyrophyllite by using XAFS technique. In case of weathered biotite and illite which incorporate cesium ions into interlayer site, the interatomic distances of second coordination are decrease at low concentration samples. On the other hand, pyrophyllite which doesn't incorporate cesium ions into interlayer site, has no concentration dependence of the interatomic distance of second coordination.
Iwamori, Akiyuki*; Ogita, Yasuhiro; Shimada, Koji; Tateishi, Ryo*; Takagi, Hideo*; Ota, Toru*; Kanno, Mizuho*; Wada, Shinya*; Ono, Akihiro*; Otsuka, Yoshiharu*
no journal, ,
We investigated the W value, which is an index showing the progress of weathering, for the fault rocks in the Kojak granite distributed in the eastern Wakasa area. The W value represents the contribution due to weathering calculated from the chemical composition, and along with the M value (contribution of the mafic component) and F value (contribution of the felsic component), a triangular diagram of M + F + W = 100% showing trends from protolith to fault rocks (cataclasite or fault gouge) can be drown. We also investigated on the fault at the geological boundary between the Kojaku granite and the Mino-Tamba metabasalt, and on the difference in characteristics from the fault rock in the Kojaku granite. Granite protolith has an F value of 94.2% and W value of 4.9%, and the fault rock sample has an M value of about 3% regardless of whether it is an active fault or an inactive fault. As weathering progresses, the F value decreases and the W value increases. Metabasalt has an M value of 88.2% and a W value of 6.6%, and the cataclasite has an almost constant F value. As weathering progresses, the M value decreases and the W value increases. Some of the F value increases with the increase of the W value, which is consistent with the contamination of granite-origin quartz fragments found in the basaltic fault gouge. As a result of examination, it was confirmed that Na
O and CaO have a great influence on the increase and decrease of the W value.
