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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 measurement of CaCO
samples and coral-based estimation of marine reservoir correction in the Ogasawara Islands, Northwestern Subtropical PacificKokubu, Yoko; Mitsuguchi, Takehiro*; Watanabe, Takahiro; Yamada, Tsutomu*; Asami, Ryuji*; Iryu, Yasufumi*
Radiocarbon, 61(5), p.1593 - 1601, 2019/10
Times Cited Count：3 Percentile：12.66(Geochemistry & Geophysics)We performed C measurements of two fossil and one modern corals using a combined system of an elemental analyzer and an automated graphitization equipment AGE3 (EA-AGE3 system) and JAEA-AMS-TONO. The C concentrations (pMC values) of mid-Holocene Okinawa corals obtained by our EA-AGE3 system appear to be slightly higher than those obtained by the conventional graphitization method using phosphoric acid. The pMC increase in our EA-AGE3 system may result in significant underestimation of C age especially for older samples (e.g., 10,000 BP); however, the pMC increase is negligible in C measurements of modern or recent samples. We applied the EA-AGE3 method to the pre- and post-bomb annual-band samples from the modern Ogasawara coral for C measurements. On the basis of the pre-bomb coral C data, we estimated marine reservoir correction (
R) around Ogasawara Islands and its stability between 
1900 and 1950 AD.
Gottdang, A.*; Klein, M.*; Mous, D. J. W.*; Kitamura, Toshikatsu; Mizutani, Yoshihiko*; Suzuki, Takashi; Aramaki, Takafumi; Togawa, Orihiko; Kabuto, Shoji*; Sudo, Kazuhiko*
AIP Conference Proceedings 576, p.403 - 406, 2001/00
no abstracts in English
Kojima, Takuji; Sunaga, Hiromi; Tachibana, Hiroyuki; Takizawa, Haruki; Tanaka, Ryuichi
IAEA-TECDOC-156, p.91 - 98, 2000/06
no abstracts in English
Matsubayashi, Masahito; ; J.T.Lindsay*
Nuclear Instruments and Methods in Physics Research A, 424(1), p.165 - 171, 1999/00
Times Cited Count：2 Percentile：27.25(Instruments & Instrumentation)no abstracts in English
;
IAEA-156, p.101 - 110, 1973/00
no abstracts in English
Nagai, Haruyasu; Koarashi, Jun; Atarashi-Andoh, Mariko
no journal, ,
The proposed project aims to understand processes driving carbon cycling in terrestrial ecosystems and their sensitivity to changes in environment, and to predict carbon cycle feedback to climate change. We focus on soil organic carbon (SOC) in the terrestrial ecosystems. There is growing concern that global warming can lead to accelerated microbial decomposition of SOC and enhance the release of CO
from the soil to the atmosphere. Therefore, understanding the response of SOC to global warming is the key to predicting future climate change. Predicting the response of SOC to global warming requires quantitative evaluation of the SOC decomposability. Our approach is the use of C analysis to quantify the decomposability of SOC as a complex of SOC pools characterized by their carbon stocks and specific mean residence times (MRTs). We also introduce a unique methodology using the nuclear test-derived C in the analysis. We aim to expand this study into global scale with the collaboration between FNCA member countries.
Matsubara, Akihiro; Fujita, Natsuko; Kimura, Kenji
no journal, ,
We numerically estimated the suppression efficiency of the surface stripper in the case of the grazing incidence of the 
CH with energy of tens of keV onto a single crystal surface in measurement of radiocarbon. The obtained survival probability of CH falls to below 10
at which the level is required for the practical use. This suggests the sufficient dissociation capability of the surface stripper.
