Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 62

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Synchronized gravitational slope deformation and active faulting; A Case study on and around the Neodani fault, central Japan

Komura, Keitaro*; Kaneda, Heitaro*; Tanaka, Tomoki*; Kojima, Satoru*; Inoue, Tsutomu*; Nishio, Tomohiro

Geomorphology, 365, p.107214_1 - 107214_22, 2020/09

 Times Cited Count:0 Percentile:100(Geography, Physical)

On the basis of pit excavations and sediment cores at an off-fault deep-seated gravitational slope deformation (DGSD) site and a trench excavation across the active Neodani fault at a nearby site, we examined the records of DGSD and surface-rupturing paleoearthquakes of the Neodani fault. We found the four most recent DGSD events and the four most recent surface-rupturing earthquakes, respectively and conclude that the ages of events are overlapped each other. We infer that static crustal strain from repeated seismogenic faulting plays an important role in the occurrence of DGSD events, at least in the immediate vicinity of active faults, although coseismic severe shaking would have at least some effect on them. Our case study suggests that off-fault DGSDs can be used to reconstruct or refine the paleoseismic history of a nearby active fault.

Journal Articles

Radiocarbon dating of a shrine pavilion and offerings at Abushina shrine in Gifu prefecture, Japan

Kokubu, Yoko; Nishio, Tomohiro; Fujita, Natsuko; Matsubara, Akihiro

Proceedings of the 8th East Asia Accelerator Mass Spectrometry Symposium and the 22nd Japan Accelerator Mass Spectrometry symposium (EA-AMS 8 & JAMS-22), p.91 - 93, 2020/00

no abstracts in English

Journal Articles

Present status of the JAEA-AMS-TONO in 2019

Fujita, Natsuko; Matsubara, Akihiro; Miyake, Masayasu*; Watanabe, Takahiro; Kokubu, Yoko; Kato, Motohisa*; Okabe, Nobuaki*; Isozaki, Nobuhiro*; Ishizaka, Chika*; Nishio, Tomohiro; et al.

Proceedings of the 8th East Asia Accelerator Mass Spectrometry Symposium and the 22nd Japan Accelerator Mass Spectrometry symposium (EA-AMS 8 & JAMS-22), p.34 - 36, 2020/00

no abstracts in English

Journal Articles

Current status of JAEA-AMS-TONO in the 20th year

Kokubu, Yoko; Fujita, Natsuko; Miyake, Masayasu; Watanabe, Takahiro; Ishizaka, Chika; Okabe, Nobuaki; Ishimaru, Tsuneari; Matsubara, Akihiro*; Nishizawa, Akimitsu*; Nishio, Tomohiro*; et al.

Nuclear Instruments and Methods in Physics Research B, 456, p.271 - 275, 2019/10

 Times Cited Count:0 Percentile:100(Instruments & Instrumentation)

JAEA-AMS-TONO has been in operation at the Tono Geoscience Center, Japan Atomic Energy Agency since 1998 and 20 years have passed from the beginning of its utilization. The AMS system is a versatile system based on a 5 MV tandem Pelletron type accelerator. The system has been used to measure carbon-14 ($$^{14}$$C), beryllium-10 ($$^{10}$$Be) and aluminium-26 ($$^{26}$$Al). In addition, the development of measurement of iodine-129 ($$^{129}$$I) has been started. The main use is measurement of $$^{14}$$C in geological samples for dating studies in neotectonics and hydrogeology. In order to increase the speed of sample preparation, we introduced the automated graphitization equipment and made a gas-strip line to collect dissolved inorganic carbon in groundwater samples. Measurement of $$^{10}$$Be and $$^{26}$$Al has been used for geoscience studies and the detection limit in the measurement of $$^{10}$$Be was improved by $$^{7}$$Be-counting suppression. Recently tuning of measurement condition of $$^{129}$$I has been progressed.

Journal Articles

The present status of the AGE3 automated graphitization equipment for radiocarbon dating at the JAEA-AMS-TONO

Watanabe, Takahiro; Kokubu, Yoko; Fujita, Natsuko; Ishizaka, Chika*; Nishio, Tomohiro; Matsubara, Akihiro*; Miyake, Masayasu; Kato, Motohisa*; Isozaki, Nobuhiro*; Torazawa, Hitoshi*; et al.

JAEA-Conf 2018-002, p.116 - 119, 2019/02

AMS is widely used for radiocarbon dating of geological samples. However, improvement in efficiency of sample preparation techniques are needed for high-time resolution dataset. In 2016, automated graphitization equipment (AGE3, IonPlus AG) has been installed in Toki Research Institute of Isotope Geology and Geochronology, Tono Geoscience Center, JAEA. Background values and carbon recovery rates during preparation process of AGE3 should be estimated before application in radiocarbon dating. In this study, the AGE3 system was evaluated using the international standard materials (IAEA-C1, C4, C5, C6, C7, C9 and NIST-SRM4990C) at JAEA-AMS-TONO. Graphite samples was prepared by the AGE3 system and radiocarbon concentration of these standards was measured by AMS. The results were agreement with the consensus values. Background values were 0.15$$pm$$0.01 pMC (IAEA-C1) using the AGE3 system. Therefore, we concluded that the system can be adapted for radiocarbon dating of geological samples.

Journal Articles

Improvement of methods for measurement of $$^{129}$$I/$$^{127}$$I ratio at JAEA-AMS-TONO

Okabe, Nobuaki; Fujita, Natsuko; Matsubara, Akihiro*; Miyake, Masayasu; Nishio, Tomohiro*; Nishizawa, Akimitsu*; Isozaki, Nobuhiro*; Watanabe, Takahiro; Kokubu, Yoko

JAEA-Conf 2018-002, p.51 - 54, 2019/02

no abstracts in English

Journal Articles

The Twenty years of JAEA-AMS-TONO

Kokubu, Yoko; Fujita, Natsuko; Matsubara, Akihiro*; Nishizawa, Akimitsu*; Nishio, Tomohiro; Miyake, Masayasu; Ishimaru, Tsuneari; Watanabe, Takahiro; Ogata, Nobuhisa; Shimada, Akiomi; et al.

JAEA-Conf 2018-002, p.5 - 8, 2019/02

no abstracts in English

Journal Articles

Present status of the accelerator facility at the JAEA-AMS-TONO; 2016

Fujita, Natsuko; Miyake, Masayasu; Watanabe, Takahiro; Kokubu, Yoko; Ishimaru, Tsuneari; Matsubara, Akihiro*; Nishio, Tomohiro*; Kato, Motohisa*; Isozaki, Nobuhiro*; Torazawa, Hitoshi*; et al.

JAEA-Conf 2018-013, p.96 - 99, 2019/02

no abstracts in English

Journal Articles

Present status of the accelerator facility at the JAEA-AMS-TONO; 2017

Fujita, Natsuko; Miyake, Masayasu; Watanabe, Takahiro; Kokubu, Yoko; Matsubara, Akihiro*; Kato, Motohisa*; Okabe, Nobuaki; Isozaki, Nobuhiro*; Ishizaka, Chika*; Torazawa, Hitoshi*; et al.

Dai-31-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.92 - 95, 2018/12

no abstracts in English

JAEA Reports

Gas-strip methods of dissolved inorganic carbon in groundwater for radiocarbon analysis

Kato, Toshihiro; Iwatsuki, Teruki; Nishio, Tomohiro*

JAEA-Technology 2017-009, 30 Pages, 2017/06

JAEA-Technology-2017-009.pdf:2.6MB

Groundwater age is an important information to infer the groundwater flow. The radiocarbon ($$^{14}$$C) dating of the groundwater is primary method for the evaluation of groundwater flow. The carbon in the groundwater generally exist as a dissolved inorganic carbon (DIC). Though DIC in groundwater samples is usually collected by chemical precipitation method, the method requires lots of preparation to sample the carbon. Furthermore there are problems with the reproducibility on precipitation and measurement value. This study newly examined the application of gas-strip method to collect DIC in groundwater sample by using JAEA-made gas-strip system. The performance of the CO$$_{2}$$ gas-stripping from groundwater and the influence of sulfide are investigated. Based on these results, the operation procedures of gas-strip system and preparation method for the groundwater samples were summarized in this report.

Journal Articles

Present status of the JAEA-AMS-TONO; 2016

Fujita, Natsuko; Miyake, Masayasu; Watanabe, Takahiro; Kokubu, Yoko; Ishimaru, Tsuneari; Matsubara, Akihiro*; Isozaki, Nobuhiro*; Nishio, Tomohiro*; Kato, Motohisa*; Torazawa, Hitoshi*; et al.

Dai-19-Kai AMS Shimpojiumu, 2016-Nendo "Jumoku Nenrin" Kenkyukai Kyodo Kaisai Shimpojiumu Hokokushu, p.68 - 71, 2017/06

no abstracts in English

Journal Articles

Present status of the tandem accelerator at the JAEA-AMS-TONO; 2015

Fujita, Natsuko; Matsubara, Akihiro*; Watanabe, Takahiro; Kokubu, Yoko; Umeda, Koji*; Ishimaru, Tsuneari; Nishizawa, Akimitsu*; Miyake, Masayasu; Owaki, Yoshio*; Nishio, Tomohiro*; et al.

Dai-29-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.39 - 42, 2017/03

no abstracts in English

Journal Articles

Present status of the JAEA-AMS-TONO; 2015

Fujita, Natsuko; Matsubara, Akihiro; Watanabe, Takahiro; Kokubu, Yoko; Umeda, Koji; Nishizawa, Akimitsu*; Miyake, Masayasu*; Owaki, Yoshio*; Nishio, Tomohiro*; Kato, Motohisa*

Dai-18-Kai AMS Shimpojiumu Hokokushu, p.85 - 90, 2016/12

no abstracts in English

Journal Articles

Progress on multi-nuclide AMS of JAEA-AMS-TONO

Kokubu, Yoko; Matsubara, Akihiro; Miyake, Masayasu*; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*; Sanada, Katsuki*; Hanaki, Tatsumi

Nuclear Instruments and Methods in Physics Research B, 361, p.48 - 53, 2015/10

 Times Cited Count:11 Percentile:18.6(Instruments & Instrumentation)

The JAEA-AMS-TONO facility was established in 1997 at the Tono Geoscience Center, Japan Atomic Energy Agency. Our AMS system has been made available for $$^{14}$$C- and $$^{10}$$Be-AMS. At present, the development of $$^{26}$$Al-AMS has been conducted to enhance the capability for multi-nuclide AMS. In this presentation, we report the progress on multi nuclide AMS in addition to the status of our facility.

Journal Articles

Present status of the JAEA-AMS-TONO; FY2013

Matsubara, Akihiro; Fujita, Natsuko; Nishizawa, Akimitsu*; Miyake, Masayasu*; Nishio, Tomohiro*; Owaki, Yoshio*; Sanada, Katsuki*; Kokubu, Yoko; Ishimaru, Tsuneari

Dai-27-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.47 - 51, 2015/03

Steady progress has been made in the development of a multi-nuclide AMS system for measurement of rare radionuclides ($$^{10}$$Be, $$^{14}$$C, and $$^{26}$$Al) to apply geochronological dating methods. In this article we will report the current status of the JAEA-AMS-TONO.

Journal Articles

Radiocarbon dating of seeds and a wood excavateed at Emon site

Kokubu, Yoko; Matsubara, Akihiro; Ishimaru, Tsuneari; Miyake, Masayasu*; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*

Heisei-24-Nendo Tokishi Shinai Iseki Hakkutsu Chosa Hokokusho, p.28 - 30, 2014/03

Radiocarbon dating using accelerator mass spectrometry (AMS) was performed on Gramineae spp. seeds and a wood trunk collected from layers of IVb and Vb at the trench 1 of Emon site. After counting of number of tree rings of the trunk, 5 rings containing the outermost layer and the innermost one were cut to obtain wiggle-matched calibrated ages. In JAEA-AMS-TONO, graphite were made from the seeds and the rings and then their carbon isotope ratios were measured by AMS to obtain radiocarbon date. Calendar ages were calculated from the radiocarbon dates. Calendar ages of two seeds collected from the IVb layer were ranged between century of 15 and 17. That of the outermost layer of the trunk was about 1300 calAD, which was older than those of the seeds. On the other hand, those of the seeds collected from the Vb layer were 14 century.

Journal Articles

Current status of the AMS facility at the Tono Geoscience Center of the Japan Atomic Energy Agency

Kokubu, Yoko; Nishizawa, Akimitsu*; Suzuki, Mototaka*; Owaki, Yoshio*; Nishio, Tomohiro*; Matsubara, Akihiro; Saito, Tatsuo; Ishimaru, Tsuneari; Umeda, Koji; Hanaki, Tatsumi

Nuclear Instruments and Methods in Physics Research B, 294, p.43 - 45, 2013/01

 Times Cited Count:3 Percentile:68.05(Instruments & Instrumentation)

The Tono Geoscience center of JAEA installed the JAEA-AMS-TONO system at 1997. Since 1998, the system has routinely used for $$^{14}$$C-AMS. Recently, about 800 samples/y have been measured mainly for studies of neotectonics and hydrogeology in relation to research of geosphere stability for long-term Isolation of high-level radioactive waste. Under the common-use facility program, the system has also been used by researchers of universities and other institutes. In addition, $$^{10}$$Be-AMS has been developed for geochronological study. A gas ionisation detector was exchanged. As the detector has a gas absorber cell which has larger volume than the previous one, it is possible to remove $$^{10}$$B efficiently. Test measurement by using several standard samples supplied from University of California, Berkeley was performed. Ratios of $$^{10}$$Be/$$^{9}$$Be were comparable to the certified values, indicating that our system has sufficient ability to be useful to $$^{10}$$Be-AMS.

Journal Articles

Current status of JAEA-AMS-TONO, the Japan Atomic Energy Agency

Matsubara, Akihiro; Kokubu, Yoko; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*; Ishimaru, Tsuneari; Hanaki, Tatsumi

Proceedings of 4th East Asian Symposium on Accelerator Mass Spectrometry (EA-AMS-4), p.147 - 150, 2011/12

The JAEA-AMS-TONO at Tono Geoscience Center, Japan Atomic Energy Agency has provided rare isotope concentrations in sample materials for studies of geological environments of deep underground for development of the geological disposal of high-level radioactive waste. The core facility is a versatile AMS system based on National Electrostatics Corporation Moldel 15SDH-2 (5 MV) Pelletron Accelerator installed in 1997. This system was designed for the determination of the isotopic ratios of beryllium, carbon, aluminium, chlorine, etc. We have also developed $$^{10}$$Be-AMS in order to further expand the system utilization for applications such as estimation of the exposure age of basement rocks and the sedimentation rates. In this article, the current status of $$^{14}$$C-AMS and $$^{10}$$Be-AMS in the JAEA-AMS-TONO are described.

Journal Articles

Present status of the JAEA-AMS-TONO; 2010

Ishimaru, Tsuneari; Kokubu, Yoko; Matsubara, Akihiro; Hanaki, Tatsumi; Yasue, Kenichi; Nishizawa, Akimitsu*; Suzuki, Mototaka*; Owaki, Yoshio*; Nishio, Tomohiro*

Dai-13-Kai AMS Shimpojiumu Hokokusho, p.11 - 14, 2011/01

no abstracts in English

Journal Articles

Present status of the JAEA-AMS-TONO; FY2009

Kokubu, Yoko; Nishizawa, Akimitsu*; Suzuki, Mototaka*; Owaki, Yoshio*; Nishio, Tomohiro*; Matsubara, Akihiro; Ishimaru, Tsuneari

Dai-23-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.45 - 48, 2010/11

no abstracts in English

62 (Records 1-20 displayed on this page)