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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
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
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：15 Percentile：74.91(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 
C- and 
Be-AMS. At present, the development of 
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.
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 (Be, C, and Al) to apply geochronological dating methods. In this article we will report the current status of the JAEA-AMS-TONO.
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.
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：4 Percentile：31.96(Instruments & Instrumentation)The Tono Geoscience center of JAEA installed the JAEA-AMS-TONO system at 1997. Since 1998, the system has routinely used for 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, 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 B efficiently. Test measurement by using several standard samples supplied from University of California, Berkeley was performed. Ratios of Be/
Be were comparable to the certified values, indicating that our system has sufficient ability to be useful to Be-AMS.
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 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 C-AMS and Be-AMS in the JAEA-AMS-TONO are described.
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
Matsubara, Akihiro; Nishizawa, Akimitsu*; Suzuki, Mototaka*; Owaki, Yoshio*; Nishio, Tomohiro*; Kokubu, Yoko; Ishimaru, Tsuneari
Dai-23-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.53 - 56, 2010/11
no abstracts in English
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
Kokubu, Yoko; Ishimaru, Tsuneari; Nishizawa, Akimitsu*; Suzuki, Mototaka*; Owaki, Yoshio*; Nishio, Tomohiro*; Kitazawa, Toshiyuki*
Dai-12-Kai AMS Shimpojiumu Hokokushu, p.5 - 8, 2010/05
no abstracts in English
C measurement with JAEA-AMS-TONO and the common-use facility programKokubu, Yoko; Suzuki, Mototaka; Ishimaru, Tsuneari; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*
JAEA-Conf 2010-001, p.84 - 87, 2010/03
no abstracts in English
Kokubu, Yoko; Suzuki, Mototaka; Ishimaru, Tsuneari; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*
Dai-22-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.42 - 45, 2010/02
A Tandem Accelerator Mass Spectrometry system (JAEA-AMS-TONO) was installed at the Tono Geoscience Center, JAEA in 1997 for measurement isotopes in environmental samples. The main activity is radiocarbon dating for geoscience. The system has offered services for the facility utilization for scientists who work in external institutions since 2006. In this presentation, we report to annual operation status and improvements in the system at the fiscal year of 2008. Measured samples and time have reached 879 and 1102 h in the fiscal year. In order to stabilize an ion beam, we rearranged an injection beam line, adjusted the temperature on a Cs oven of an ion source and improved a rotating shaft of an index wheel and a corona probe.
Suzuki, Mototaka; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*; Saito, Tatsuo; Sasao, Eiji
JAEA-Conf 2008-005, p.34 - 37, 2008/03
no abstracts in English
Ishimaru, Tsuneari; Kokubu, Yoko; Matsubara, Akihiro; Yasue, Kenichi; Doke, Ryosuke; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*
no journal, ,
The Japan Atomic Energy Agency (JAEA) installed the JAEA-AMS-TONO system in 1997 at Tono Geoscience Center. The system has routinely been used for C-AMS and has been developed for use in Be-AMS. Under the common-use facility program of JAEA, the system has also been available and used by researchers from universities and other institutes. In this presentation, we report current status of the system and the application studies. In fiscal year 2010, machine time for the Be-AMS was increased because we kicked into gear to technology development of the Be-AMS. For the C-AMS, 520 samples were measured and 87 of the samples were measured upon requests of 4 studies under the common-use facility program. The JAEA applied this C-AMS to geochronological studies such as estimation of sedimentation rate of soil and of retention time of ground water for research and development related to the geological disposal of high-level radioactive waste.
Kokubu, Yoko; Matsubara, Akihiro; Fujita, Natsuko; Watanabe, Takahiro; Umeda, Koji; Miyake, Masayasu*; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*; Sanada, Katsuki*; et al.
no journal, ,
The JAEA-AMS-TONO facility at the Tono Geosciences Center, Japan Atomic Energy Agency has an AMS system. Since November 2014, the Toki Research Institute of Isotope Geology and Geochronology has been established at the Center, developing multiple radiometric dating of geological samples and the JAEA-AMS-TONO is the main facility in the institute. The facility has routinely analyzed C and Be for investigations into deep underground environments and has performed test measurement of Al. In this presentation, we report our present status.
Suzuki, Mototaka; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*; Saito, Tatsuo; Sasao, Eiji
no journal, ,
This paper reports the situation of JAEA-AMS-TONO operation and maintenance of this year.
Suzuki, Mototaka; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*; Saito, Tatsuo; Ishimaru, Tsuneari
no journal, ,
JAEA-AMS-TONO, tandem AMS(NEC 15SDH-2 PELLETRON) was introduced for analization of natural samples of rocks or underwaters. We report present status of the JAEA-AMS-TONO, maintenance and inprovement since last July.
Kokubu, Yoko; Nishizawa, Akimitsu*; Suzuki, Mototaka*; Owaki, Yoshio*; Nishio, Tomohiro*; Matsubara, Akihiro; Ishimaru, Tsuneari
no journal, ,
no abstracts in English
Be with JAEA-AMS-TONOKokubu, Yoko; Matsubara, Akihiro; Nishizawa, Akimitsu*; Owaki, Yoshio*; Nishio, Tomohiro*; Ishimaru, Tsuneari; Matsuzaki, Hiroyuki*
no journal, ,
no abstracts in English
