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Kagami, Saya; Yokoyama, Tatsunori; Umeda, Koji*
JAEA-Testing 2021-001, 49 Pages, 2021/08
JAEA-Testing-2021-001.pdf:3.86MB
To make a contribution to safety assessment for geological disposal of high level radioactive and/or TRU waste, we need to assess long-term stability of geological environment and predict long-term changes of geotectonic events that will occur in the future, especially for Quaternary period (
2.6 million years ago-present). In the most case, we investigate chronological data of geological events by radiometric dating. When some geological samples have no objects to which radiometric dating method can be applied (e.g., zircon, biotite, wood fragments and plant residues), we can use tephrochronology, which is geological dating method using each layer of tephra (erupted volcanic ash), for dating of geological layers. This chronological method is essential in Japan, where volcanism is very active. Tephra is usually characterized by petrographic characteristics and/or chemical composition (mainly major elements) of volcanic glasses and/or minerals in tephra. In Tono Geoscience Center (Japan Atomic Energy Agency), we develop an analytical technique of chemical composition including trace elements of volcanic glasses for detailed tephra identification. In this paper, we report a sample preparation procedure and analytical methods of chemical compositions of individual volcanic glass shards by using an electron probe microanalyzer and a laser ablation-inductively coupled plasma-mass spectrometer.
Matsunaga, Takeshi; Yanase, Nobuyuki; Hanzawa, Yukiko; Tsuzuki, Katsunori; Naganawa, Hirochika
Journal of Water and Environment Technology (Internet), 3(2), p.243 - 252, 2005/00
In a tributary watershed of the Kuji River of Japan, the hydrological components of runoff associated with a rain storm event were investigated using isotope tracers of hydrogen (
H) and oxygen (
O) in precipitations and stream water. The runoff was separated into either "old water" (pre-existing in the ground before the storm) and "new water"(from the storm precipitation). It was found that the discharge of several hazardous trace elements (Sb, Cu, Cr) was largely (24-54%) attributable to that of the new water in spite of its small contribution to the total water discharge. These investigations suggest that the new water may play an important role in the migration of atmospherically derived, hazardous trace elements to streams during rain storms.
Arakawa, Kazuo
Aisotopu, Hoshasen Riyo Foramu Koen Rombunshu, 5 Pages, 2003/00
no abstracts in English
Kamiya, Tomihiro
Radioisotopes, 50(8), p.42 - 48, 2001/08
no abstracts in English
Oshima, Masumi
Look Japan, 5, p.30 - 31, 2000/06
no abstracts in English
Yamasaki, Shinichi*
JNC TJ8430 2000-005, 159 Pages, 2000/03
JNC-TJ8430-2000-005.pdf:3.95MB
no abstracts in English
Hatsukawa, Yuichi; Oshima, Masumi; Hayakawa, Takehito; Toh, Yosuke; Shinohara, Nobuo
Hoshaka Bunseki, (10), p.19 - 20, 2000/03
no abstracts in English
; ; ; Terunuma, Kuzuo; *; *; *
Antei Doui Genso O Meguru Yume No Kiseki; The Story, p.37 - 60, 1997/00
no abstracts in English
Kamiya, Tomihiro
Radioisotopes, 44(8), p.570 - 590, 1995/08
no abstracts in English
Tsuji, Hirokazu; *; *; Nakajima, Hajime
Journal of Nuclear Science and Technology, 31(2), p.122 - 129, 1994/02
Times Cited Count：3 Percentile：35.79(Nuclear Science & Technology)no abstracts in English
Tanaka, Ryuichi; Kamiya, Tomihiro
Hoshasen, 20(3), p.21 - 32, 1994/00
no abstracts in English
Shin, Sumio*; Sato, Kiichi*; Nishida, Hiroshi*; Sakamoto, Shoichi*; Yamabayashi, Hisamichi; Motoki, Ryozo; Terunuma, Kusuo; Yamamoto, Takeo
Igaku No Ayumi, 140(1), p.51 - 52, 1987/01
Trace elements serve as key components of enzyme systems and have especially important correlation with fetal maturity.
Radioisotopes, 24(3), P. 103, 1975/03
no abstracts in English
; ; ; *
Bunseki Kagaku, 10(3), p.221 - 226, 1961/00
no abstracts in English
;
Bunseki Kagaku, 9(10), p.830 - 836, 1960/00
no abstracts in English
Takahashi, Hideyuki*; Asahina, Shunsuke*; Murano, Takanori*; Takakura, Yu*; Terauchi, Masami*; Koike, Masato; Imazono, Takashi; Koeda, Masaru*; Nagano, Tetsuya*; Sasai, Hiroyuki*; et al.
no journal, ,
We developed a soft X-ray emission spectrometer (SXES) with a detection range of 50-210 eV to be able to be installed in commercially available EMPAs and FE-SEMs. This SXES has the spectral resolution of 0.2 eV comparably high with X-ray photo emission spectrometers (XPSs) and electron energy-loss spectrometers (EELSs). In addition, it allows us to perform trace light element analysis with high sensitivity because of high peak-to-background ratio (P/B). Therefore, it is shown that the SXES installed in a FE-SEM can detect trace carbon in steel at the level of 100 ppm and below.
Sasaki, Takayuki*; Kokami, Takayuki*; Amamiya, Hiroki; Murakami, Hiroaki; Amano, Yuki; Iwatsuki, Teruki; Mizuno, Takashi; Kobayashi, Taishi*; Kirishima, Akira*
no journal, ,
For thermodynamic analysis of the trace metals in groundwater, concentrations of Th, U, and rare earth elements (REEs) were investigated at Horonobe Underground Research Laboratory. Groundwater was sampled in anaerobic condition directly from a packed section in the boreholes drilled to 140 m and 250 m depth in drift. The colloidal distribution was checked by an on-site batch ultrafiltration unit using 0.2 
m or 10 kDa membranes. As the result, both Th and U concentrations could be estimated by thermodynamic calculations, assuming that the soluble solid phases are restricted to ThO
(cr) and UO(cr), respectively. Meanwhile, the concentrations of REEs were also very low, and significant colloidal distribution for lighter REEs was observed. In the thermodynamic analysis where the lanthanide phosphate was assumed to be a solid phase, the experimental plots matched better with the calculated one, even though the changing trend differs from each other.
