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Collaborative Laboratories for Advanced Decommissioning Science; National Institutes of Natural Sciences*
JAEA-Review 2022-059, 34 Pages, 2023/01
JAEA-Review-2022-059.pdf:1.58MB
The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2021. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2021, this report summarizes the research results of the "Development of the continuous monitoring of tritium water by mid-infrared laser spectroscopy" conducted in FY2021. The present study aims to demonstrate the principle of short-time measurement of tritiated water at the "60 Bq/cc level" using a cavity ring-down measurement system with a mid-infrared laser. In order to achieve the above goal, (1) research on the cavity ring-down system and (2) evaluation of hydrogen isotope composition under environmental conditions and preparation of standard samples (subcontractor: Hirosaki University) were conducted this fiscal year. In (1), a mid-infrared cavity ring-down test was conducted. An optical bench (3 m 
1.2 m) was set up in the laboratory, …
Abe, Takeyasu; Kuribayashi, Takahiro*; Nakamura, Michihiko*
European Journal of Mineralogy, 29(6), p.949 - 957, 2017/12
Times Cited Count：2 Percentile：6.21(Mineralogy)Polarised infrared spectra of synthetic single crystals and radiation-damaged natural samples were collected to examine hydroxyl incorporation in monazite. The IR spectra of pure synthetic monazite contain two OH stretching bands at 3163 and 3335 cm
with contrasting bandwidths of 40 and 90 cm, respectively. The two OH bands show strong pleochroism and dominant infrared absorption in the Y direction. The IR spectra of natural monazite contains a weak pleochroic OH band centered around 3400 cm with a bandwidth of more than 200 cm. During step-heating experiments, this broad OH band split into several bands, and these bands differ from those observed in the spectra of synthetic samples. The OH stretching signals in the spectra of both natural and synthetic samples disappeared after heating at 1000
C. Based on these results, OH defects in natural monazite arise because of secondary hydration facilitated by radiation damage, as in the case of natural zircon and xenotime.
CNagano, Tetsushi; *; ; *;
Clays and Clay Minerals, 40(5), p.600 - 607, 1992/00
Times Cited Count：32 Percentile：74.64(Chemistry, Physical)no abstracts in English
; *; *
Geochemical Journal, 23, p.57 - 64, 1989/00
Times Cited Count：26 Percentile：59.44(Geochemistry & Geophysics)no abstracts in English
Nihon Denshi Nyusu, 27(1-2), p.12 - 17, 1987/02
no abstracts in English
