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Aramaki, Takafumi*; Togawa, Orihiko; Otosaka, Shigeyoshi
JAEA-Conf 2010-001, p.39 - 43, 2010/03
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
C signaturesOtosaka, Shigeyoshi; Tanaka, Takayuki; Minakawa, Masayuki*
JAEA-Conf 2010-001, p.113 - 117, 2010/03
Transport processes of particulate materials were discussed from elemental and isotopic proxies of seabed sediment, suspended particles and sinking particles collected from northeastern region of the Japan Sea. Isotopic ratios of radiocarbon in suspended/sedimentary organic matter decreased with a horizontal distance from the shelf edge. Assuming that the decrease of the isotopic ratio is due to the radioactive decay of radiocarbon, the authors estimated that suspended particles were transported horizontally through the benthic layer at a speed of 200 m/year.
I in soil using accelerator mass spectrometryKokubun, Yuji; Nakano, Masanao; Sumiya, Shuichi
JAEA-Conf 2010-001, p.26 - 29, 2010/03
no abstracts in English
C measurement at JAEA-AMS-MUTSU; Attempt on a small quantity of sampleTanaka, Takayuki; Kabuto, Shoji; Kinoshita, Naoki; Yamamoto, Nobuo
JAEA-Conf 2010-001, p.122 - 125, 2010/03
In the investigations on substance dynamics using the molecular weight and chemical fractionation, the utilization of C measurement by an accelerator mass spectrometry (AMS) have started. As a result of the fractionation, sample contents required for AMS measurement have been downsized. We expect that this trend toward a small quantity of sample will be steadily accelerated in the future. As C measurement by AMS established at Mutsu office require about 2 mg of sample content at present, our AMS lags behind the others in the trend. We try to downsize the needed sample content for C measurement by our AMS. In this study, we modified the shape of the target-piece in which the sample is packed and which is regularly needed to radiocarbon measurement by our AMS. Moreover, we improved on the apparatus needed to pack the sample. As a result of the improvement, we revealed that it is possible to measure the C using our AMS even by the amount of the sample of about 0.5 mg.
Atarashi-Andoh, Mariko; Koarashi, Jun; Ishizuka, Shigehiro*; Hirai, Keizo*
JAEA-Conf 2010-001, p.80 - 83, 2010/03
no abstracts in English
ISuzuki, Takashi; Minakawa, Masayuki*; Togawa, Orihiko
JAEA-Conf 2010-001, p.15 - 18, 2010/03
no abstracts in English
Yamamoto, Nobuo; Kinoshita, Naoki; Kabuto, Shoji; Tanaka, Takayuki
JAEA-Conf 2010-001, p.88 - 91, 2010/03
Tandetron Accelerator Mass Spectrometer in the Japan Atomic Energy Agency Mutsu office (JAEA AMS Mutsu: High Voltage Engineering Europa product, Model 4130-AMS) consists of 3MV tandem type accelerator and the 2 beam lines for measurement of isotope ratio for carbon and iodine. Steady operation of carbon beam line was started in December, 1999 and that of iodine beam line was started in May, 2003. This facility was initially used for studies on transport processes of radionuclides in marine environment. From the fiscal year 2006, this facility became a shared facility to provide data for various projects at JAEA and others. This report describes the status of recent utilization of JAEA AMS MUTSU and the revision of the charge from fiscal year 2010.
Kabuto, Shoji; Kinoshita, Naoki; Tanaka, Takayuki; Yamamoto, Nobuo
JAEA-Conf 2010-001, p.126 - 129, 2010/03
A Tandetron Accelerator Mass Spectrometer (AMS) manufactured by High Voltage Engineering Europa in Netherlands had been set up at the Mutsu office of Aomori Research and Development Center, Japan Atomic Energy Agency (JAEA) in 1997. This AMS features 3MV Tandetron accelerator and two independence beamlines for C and I measurement. This AMS has measured both internal and external JAEA researcher's samples based on an open door policy since April 2006. Furthermore, the total operation time of this AMS from the routine operation started exceeds more than 20,000 hours in this year. In this report, we describe not only the summary of the current status and troubles from the previous symposium but also the upgrading of the operation system in this AMS which is carried out from June to July in 2009.
Kuwabara, Jun
JAEA-Conf 2010-001, p.118 - 121, 2010/03
In pretreatment of environmental samples such as food for measurement of I-129, dry ashing method with electric furnace is often used. On the dry ashing method, suspicious case to certify the homogeneity of iodine from both sample and carrier may occur due to low iodine recovery depending on the sample type. In this study, wet ashing with silver-mediated electrochemical method was applied to pretreatment of environmental sample analysis. Dried Laminariaceae (Konbu) sample was tried to digest using electrolysis device with nitric acid and silver nitrate. At the condition of 1g sample, 
10V and 2A, fibrous suspended matter disappeared in about 24 hours.
Nishizawa, Masato; Suzuki, Takashi; Nagai, Haruyasu; Togawa, Orihiko
JAEA-Conf 2010-001, p.105 - 108, 2010/03
no abstracts in English
C concentration in tree rings of beech trees living near CO
vents in the Hakkoda Cardera, Aomori, JapanHoriuchi, Kazuho*; Chiba, Takuji*; Hoshino, Yasuharu*; Oyama, Motonari*; Tanaka, Takayuki; Amano, Hikaru*
JAEA-Conf 2010-001, p.71 - 74, 2010/03
We investigated how volcanic CO emission affects the C concentrations in tree rings of beech trees in the Hakkoda Caldera in Aomori, which is one of high emission regions of volcanic CO in the world. There was a tendency that the obtained C concentrations were, surprisingly, quite near to the values of the concurrent atmospheric CO and decreased from 1991 to 2001. The C concentrations in caldera are lower than those of the control samples taken from a beech living outside of the caldera. We revealed the possibility that we can solve the local dynamics of fossil CO emission using C in tree rings. However, the maximum difference of C between inside and outside of the caldera was 14 permil. This result showed that the volcanic CO mixed with atmospheric CO by 4.4 ppm or less. As the trunk absorbing CO exist in height that is several meters higher than the volcanic CO vents, the low mixing may occur.
