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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
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
2 mMatsubara, Akihiro; Fujita, Natsuko; Kimura, Kenji
Proceedings of the 8th East Asia Accelerator Mass Spectrometry Symposium and the 22nd Japan Accelerator Mass Spectrometry symposium (EA-AMS 8 & JAMS-22), p.57 - 59, 2020/00
no abstracts in English
C dating using EA-AGE3 at JAEA-AMS-TONOWatanabe, Takahiro; Kokubu, Yoko; Fujita, Natsuko; Ishizaka, Chika*; Nishio, Tomohiro; Matsubara, Akihiro; Miyake, Masayasu*; Isozaki, Nobuhiro*; Nishizawa, Akimitsu*
no journal, ,
Accelerator Mass Spectrometry is widely used for radiometric dating of geological samples. However, improvement in efficiency of sample preparation techniques and trace analysis are needed for high-time resolution dataset. To improve in efficiency of sample preparation techniques and trace analysis, the elemental analyzer and automated graphitization equipment 3 (EA-AGE3) were installed at the Tono Geoscience Center, JAEA. In this study, small amount graphitization of international standard reference materials for radiocarbon dating was tested by the EA-AGE3. For the trace analysis, radiocarbon measurements were performed by the AMS system. The radiocarbon concentrations of the standard materials were good agreement with the consensus values by the international radiocarbon conference within 
2
.
I measurement of CaCO
samples in JAEA-AMS-TONOMitsuguchi, Takehiro; Okabe, Nobuaki*; Miyake, Masayasu*; Matsubara, Akihiro; Fujita, Natsuko; Watanabe, Takahiro; Kokubu, Yoko
no journal, ,
A preliminary test for AMS I measurement of CaCO samples was performed using a tandem Pelletron AMS system at Tono Geoscience Center, Japan Atomic Energy Agency (JAEA-AMS-TONO). An annually-banded coral collected from Vietnam was used for this test. The procedure of the test was as follows: (1) an annual-band sample of AD 1946-47 from the coral was treated with 1% HCl for removal of its surface portion; (2) the treated sample was dissolved in HPO
solution; (3) an aliquot from the sample solution was used for 
I measurement by ICP-MS; (4) the Woodward iodine standard was added as a carrier to the sample solution; (5) iodine was extracted from the solution by solvent extraction and back-extraction, resulting in an aqueous phase with extracted iodine; (6) AgNO(aq) was added to the aqueous phase to obtain AgI precipitate; (7) the AgI precipitate was mixed with Nb and pressed into a copper cathode for I measurement by JAEA-AMS-TONO. A blank test of this procedure was also made to evaluate the background I effect in the sample preparation. Results we obtained were as follows: (1) the background I/I ratio was [4.3 0.1] 10
and (2) the background-corrected coral I/I ratio was [1.53 0.76] 10
. The coral I/I ratio is generally in agreement with previously-reported values of Chang et al. (2016), suggesting that AMS I measurement of CaCO samples has been generally established in JAEA-AMS-TONO.