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JAEA Reports

Annual report for research on geosphere stability for long-term isolation of radioactive waste in fiscal year 2017

Ishimaru, Tsuneari; Ogata, Nobuhisa; Shimada, Akiomi; Asamori, Koichi; Kokubu, Yoko; Niwa, Masakazu; Watanabe, Takahiro; Saiga, Atsushi; Sueoka, Shigeru; Komatsu, Tetsuya; et al.

JAEA-Research 2018-015, 89 Pages, 2019/03

JAEA-Research-2018-015.pdf:14.43MB

This annual report documents the progress of research and development (R&D) in the 3rd fiscal year during the JAEA 3rd Mid- and Long-term Plan (fiscal years 2015-2021) to provide the scientific base for assessing geosphere stability for long-term isolation of the high-level radioactive waste. The planned framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques. In this report, the current status of R&D activities with previous scientific and technological progress is summarized.

Journal Articles

Provenance identification based on EPMA analyses of heavy minerals; Case study of the Toki Sand and Gravel Formation, central Japan

Shimizu, Mayuko; Sano, Naomi; Ueki, Tadamasa; Komatsu, Tetsuya; Yasue, Kenichi*; Niwa, Masakazu

Island Arc, 28(2), p.e12295_1 - e12295_13, 2019/03

 Percentile:100(Geosciences, Multidisciplinary)

no abstracts in English

JAEA Reports

Research plan on geosphere stability for long-term isolation of radioactive waste; Scientific Program for fiscal year 2018

Ishimaru, Tsuneari; Ogata, Nobuhisa; Shimada, Akiomi; Asamori, Koichi; Kokubu, Yoko; Niwa, Masakazu; Watanabe, Takahiro; Saiga, Atsushi; Sueoka, Shigeru; Komatsu, Tetsuya; et al.

JAEA-Review 2018-020, 46 Pages, 2019/01

JAEA-Review-2018-020.pdf:1.25MB

This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency, in fiscal year 2018. The objectives and contents in fiscal year 2018 are described in detail based on the outline of 7 years plan (fiscal years 2015-2021). Background of this research is clarified with the necessity and the significance for site investigation and safety assessment, and the past progress in this report. In addition, the plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.

JAEA Reports

Annual report for research on geosphere stability for long-term isolation of radioactive waste in fiscal year 2016

Ishimaru, Tsuneari; Yasue, Kenichi*; Asamori, Koichi; Kokubu, Yoko; Niwa, Masakazu; Watanabe, Takahiro; Yokoyama, Tatsunori; Fujita, Natsuko; Saiga, Atsushi; Shimizu, Mayuko; et al.

JAEA-Research 2018-008, 83 Pages, 2018/12

JAEA-Research-2018-008.pdf:11.43MB

This annual report documents the progress of research and development (R&D) in the 2nd fiscal year during the JAEA 3rd Mid- and Long-term Plan (fiscal years 2015-2021) to provide the scientific base for assessing geosphere stability for long-term isolation of the high-level radioactive waste. The planned framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques. In this paper, the current status of R&D activities with previous scientific and technological progress is summarized.

JAEA Reports

Quick examination of heavy mineral composition based on chemical analysis using electron probe microanalyzer in the Tono Geoscience Center

Yonaga, Yusuke; Shimizu, Mayuko; Sano, Naomi; Ueki, Tadamasa; Yoshikawa, Kiyotaka*; Niwa, Masakazu

JAEA-Testing 2018-001, 29 Pages, 2018/07

JAEA-Testing-2018-001.pdf:3.82MB
JAEA-Testing-2018-001-appendix(CD-ROM).zip:1.64MB

Study on the formation process of mountains provides important clues for evaluating the uplift and erosion related to long-term changes of geological environment for geological disposal. Provenance analysis of detrital sediments is often be effective to understand the process. In the Tono Geoscience Center, quick and efficient mineralogical and chemical analyses for heavy minerals in basement rocks and sediments have been developed using the electron probe microanalyzer (JEOL JXA-8530F EPMA), as one of the promising tool for provenance analysis. To contribute evaluation of the analyses, sample preparation and EPMA analyses of heavy minerals were shown in this paper.

JAEA Reports

Research plan on geosphere stability for long-term isolation of radioactive waste; Scientific programme for fiscal year 2017

Ishimaru, Tsuneari; Ogata, Nobuhisa; Shimada, Akiomi; Kokubu, Yoko; Asamori, Koichi; Niwa, Masakazu; Watanabe, Takahiro; Saiga, Atsushi; Sueoka, Shigeru; Yokoyama, Tatsunori; et al.

JAEA-Review 2017-022, 45 Pages, 2017/12

JAEA-Review-2017-022.pdf:1.42MB

This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency, in fiscal year 2017. The objectives and contents in fiscal year 2017 are described in detail based on the outline of 7 years plan (fiscal years 2015-2021). Background of this research is clarified with the necessity and the significance for site investigation and safety assessment, and the past progress in this report. In addition, the plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.

Journal Articles

CHIME monazite dating: Pb analysis on an R$$_{rm R}$$ =100 mm spectrometer and correction of interferences between Th, U, and Pb with natural monazite

Shimizu, Mayuko; Shibata, Kenji*; Suzuki, Kazuhiro; Sueoka, Shigeru; Niwa, Masakazu

Journal of Mineralogical and Petrological Sciences, 112(2), p.88 - 96, 2017/04

 Times Cited Count:2 Percentile:66.89(Mineralogy)

This paper outlines an advanced procedure involving the chemical Th-U-total Pb isochron method (CHIME) dating of monazite using a field-emission electron probe microanalyzer (FE-EPMA) equipped with spectrometers of 100 mm Rowland circle (R$$_{rm R}$$) radius. The higher count rate of R$$_{rm R}$$ = 100 mm wavelength dispersive spectrometer (WDS) compared to R$$_{rm R}$$ = 140 mm WDS enables measurements to be taken in a shorter time. CHIME dating using R$$_{rm R}$$ = 100 mm WDS had previously been difficult because of lower resolution compared to that of R$$_{rm R}$$ = 140 mm WDS. This problem has been overcome by a new interference correction method using natural monazites.

Journal Articles

Mineralogical analysis and dating using the JEOL JXA-8530F FE-EPMA at the JAEA Tono Geoscience Center

Shimizu, Mayuko; Sano, Naomi; Suzuki, Kazuhiro

Nagoya Daigaku Nendai Sokutei Kenkyu, 1, p.36 - 43, 2017/03

We established a CHIME monazite dating method using R$$_{rm R}$$ = 100 mm spectrometers and a provenance analysis method using heavy minerals for the dating and analysis of minerals. CHIME dating has traditionally been performed with conventional R$$_{rm R}$$ = 140 mm spectrometers for measurement of U, Th, and Pb. These spectrometers, however, have low count rates in measurements of Pb. We used a JEOL JXA-8530F FE-EPMA equipped with R$$_{rm R}$$ = 100 mm spectrometers, a system installed at Tono Geoscience Center in 2014, for the CHIME dating of monazite. We corrected the spectral interferences peculiar to R$$_{rm R}$$ = 100 mm spectrometers by the method of AA mli and Griffin (1975) for monazite analyses. We calculated the correction factors by a new interference correction method using natural monazites. We also established a quick quantitative analysis and identification method for heavy minerals using the EPMA.

JAEA Reports

Quantitative X-ray Fluorescence analysis of major and trace elements in rock samples at Tono Geoscience Center

Shimizu, Mayuko; Sano, Naomi; Shibata, Kenji*

JAEA-Testing 2016-004, 40 Pages, 2017/02

JAEA-Testing-2016-004.pdf:2.69MB

X-ray fluorescence analysis is one of the methods commonly used to reveal whole-rock chemical composition, which is basic information of rock samples. This report shows methods to prepare glass beads of fused samples and to use the X-ray fluorescence spectrometer (Rigaku ZSX Primus II) housed in Tono Geoscience Center, and the evaluation of precision and accuracy of the measurement.

JAEA Reports

Annual report for research on geosphere stability for long-term isolation of radioactive waste in fiscal year 2015

Ishimaru, Tsuneari; Umeda, Koji*; Yasue, Kenichi; Kokubu, Yoko; Niwa, Masakazu; Asamori, Koichi; Watanabe, Takahiro; Yokoyama, Tatsunori; Fujita, Natsuko; Shimizu, Mayuko; et al.

JAEA-Research 2016-023, 91 Pages, 2017/02

JAEA-Research-2016-023.pdf:13.33MB

This annual report documents the progress of research and development (R&D) in the 1st fiscal year during the JAEA 3rd Mid- and Long-term Plan (fiscal years 2015-2021) to provide the scientific base for assessing geosphere stability for long-term isolation of the high-level radioactive waste. The planned framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques. In this paper, the current status of R&D activities with previous scientific and technological progress is summarized.

JAEA Reports

Research plan on geosphere stability for long-term isolation of radioactive waste; Scientific programme for fiscal year 2016

Ishimaru, Tsuneari; Yasue, Kenichi; Kokubu, Yoko; Niwa, Masakazu; Asamori, Koichi; Watanabe, Takahiro; Yokoyama, Tatsunori; Fujita, Natsuko; Shimizu, Mayuko; Hama, Yuki

JAEA-Review 2016-016, 44 Pages, 2016/08

JAEA-Review-2016-016.pdf:2.28MB

This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in JAEA, in fiscal year 2016. The objectives and contents in fiscal year 2016 are described in detail based on the outline of 7 years plan (fiscal years 2015-2021). Background of this research is clarified with the necessity and the significance for site investigation and safety assessment, and the past progress in this report. In addition, the plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.

Journal Articles

JAEA Reports

Research plan on geosphere stability for long-term isolation of radioactive waste; Scientific programme for fiscal year 2015

Umeda, Koji; Yasue, Kenichi; Kokubu, Yoko; Niwa, Masakazu; Asamori, Koichi; Fujita, Natsuko; Shimizu, Mayuko; Matsubara, Akihiro; Tamura, Hajimu; Yokoyama, Tatsunori; et al.

JAEA-Review 2015-019, 42 Pages, 2015/09

JAEA-Review-2015-019.pdf:4.64MB

This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in JAEA, in fiscal year 2015. The objectives and contents in fiscal year 2015 are described in detail based on the outline of 7 years plan (fiscal years 2015-2021). Background of this research is clarified with the necessity and the significance for site investigation and safety assessment, and the past progress in this report. In addition, the plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.

JAEA Reports

Research on geosphere stability for long-term isolation of radioactive waste; Scientific programme for fiscal years 2015-2021

Umeda, Koji; Yasue, Kenichi; Kokubu, Yoko; Niwa, Masakazu; Asamori, Koichi; Fujita, Natsuko; Shimizu, Mayuko; Shimada, Akiomi; Matsubara, Akihiro; Tamura, Hajimu; et al.

JAEA-Review 2015-012, 43 Pages, 2015/08

JAEA-Review-2015-012.pdf:1.24MB

The concept of geological disposal of high-level radioactive waste (HLW) in Japan is based on a multibarrier system which combines a stable geological environment with an engineered barrier system. Potential geological host formations and their surroundings are chosen, in particular, for their long-term stability, taking into account the fact that Japan is located in tectonically active zone. This report is to outline 7 years plan (fiscal years 2015-2021) of research and development (R&D) for geosphere stability for long-term isolation of the HLW in JAEA. Background of this research is clarified with the necessity and the significance, and the past progress in this report. The objectives, outline, contents and schedule during the next 7 years are described in detail. In addition, the plan framework is structured into the following categories: (1) Development and Systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.

Journal Articles

CHIME dating of zircon using JEOL JXA-8530F FE-EPMA at JAEA Toki Research Institute of Isotope Geology and Geochronology

Shibata, Kenji; Shimizu, Mayuko; Suzuki, Kazuhiro

Nagoya Daigaku Kasokuki Shitsuryo Bunsekikei Gyoseki Hokokusho, 26, p.126 - 131, 2015/03

no abstracts in English

Oral presentation

Geophysical and geochemical signatures associated with mantle fluids beneath an active shear zone, southwest Japan

Shimizu, Mayuko; Umeda, Koji; Asamori, Koichi; Makuuchi, Ayumu; Sueoka, Shigeru; Tamura, Hajimu

no journal, , 

In 1997, the Kagoshima earthquake doublet, consisting of two closely associated Mw 6 strike-slip events, five km and 48 days apart, has occurred in southwest Japan. The location is where an E-W trending discontinuity along 32N latitude on southern Kyushu Island is clearly defined in GPS velocities, indicating the presence of a highly active left-lateral shear zone. However, there have not been any obvious indications of active faulting at the surface prior to the earthquake doublet, which could be associated with this shear zone. Three-dimensional inversion of magnetotelluric sounding data obtained in the source region of the earthquake doublet reveals a near-vertical conductive zone with a width of 20 km, extending down to the base of the crust and perhaps into the upper mantle toward the Okinawa trough. The prominent conductor corresponds to the western part of the active shear zone. Elevated $$^{3}$$He/$$^{4}$$He ratios in groundwaters sampled from hot spring and drinking water wells suggest the emission of mantle-derived helium from the seismic source region. The geophysical and geochemical observations are significant indications that the invasion of mantle fluids into the crust, driven by upwelling asthenosphere from the Okinawa trough, triggers the notable left-lateral shearing in the zone in the present-day subduction system. In addition, the existence of aqueous fluids in and below the seismogenic layer could change the strength of the zones, and alter the local stress regime, resulting in the occurrence of the 1997 earthquake doublet.

Oral presentation

Mechanical and hydrological properties of incoming sediments at the Japan Trench and the evolution of the weak decollement

Shimizu, Mayuko; Tanikawa, Wataru*; Hamada, Yohei*; Kameda, Jun*; Yamaguchi, Asuka*; Kimura, Gaku*

no journal, , 

no abstracts in English

Oral presentation

Chemical composition variation in fault rocks from Rokko fault and Gosukebashi fault

Shimizu, Mayuko; Niwa, Masakazu; Aoki, Kazuhiro; Kametaka, Masao*

no journal, , 

no abstracts in English

Oral presentation

CHIME monazite dating using FE-EPMA equipped with R=100 mm spectrometers

Shibata, Kenji; Shimizu, Mayuko; Suzuki, Kazuhiro; Sueoka, Shigeru; Niwa, Masakazu

no journal, , 

The CHIME (Chemical Th-U-total Pb isochron method) dating has been performed on JEOL JXA-8530F FE-EPMA introduced in Tono Geoscience Center of Japan Atomic Energy Agency. Analysis of Pb on conventional spectrometers have disadvantage in count rate. JXA-8530F equipped with three R=100 provides significant shortening in analyzing time. Spectral interferences peculiar to R=100 mm spectrometers are found to be collected on the monazite analyses. The intrinsic responses of the R=100 mm counting systems with a PET crystal and a sealed Xe detector for PbMb are around ten times higher than that of the JCXA-733 counting systems. The measurement time required for a spot is ca. 35 minutes. The advanced procedure carried out 425$$pm$$25 Ma for monazite from Cooma granite in southeastern Australia, which had dated by SHRIMP as 432.8$$pm$$3.5 Ma. The CHIME monazite age of the Kojaku granite in southwestern Japan is 68$$pm$$5 Ma that accords well with the LA-ICP-MS U-Pb zircon ages of 68.5$$pm$$0.7 Ma.

Oral presentation

CHIME monazite dating using FE-EPMA

Shibata, Kenji; Shimizu, Mayuko; Suzuki, Kazuhiro; Sueoka, Shigeru; Niwa, Masakazu

no journal, , 

The CHIME (Chemical Th-U-total Pb isochron method) dating has been performed on JEOL JXA-8530F FE-EPMA introduced in Tono Geoscience Center of Japan Atomic Energy Agency. Analysis of Pb on conventional spectrometers have disadvantage in count rate. JXA-8530F equipped with three R=100 provides significant shortening in analyzing time. Spectral interferences peculiar to R=100 mm spectrometers are found to be collected on the monazite analyses. The intrinsic responses of the R=100 mm counting systems with a PET crystal and a sealed Xe detector for PbM$$beta$$ are around ten times higher than that of the JCXA-733 counting systems. The measurement time required for a spot is ca. 35 minutes. The advanced procedure carried out 425$$pm$$25 Ma for monazite from Cooma granite in southeastern Australia, which had dated by SHRIMP as 432.8$$pm$$3.5 Ma. The CHIME monazite age of the Kojaku granite in southwestern Japan is 68$$pm$$5 Ma that accords well with the LA-ICP-MS U-Pb zircon ages of 68.5$$pm$$0.7 Ma.

37 (Records 1-20 displayed on this page)