Japan Geoscience Union Meeting 2014

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Symbol H (Human Geosciences) » H-TT Technology & Techniques

[H-TT35_1AM2] Developments and applications of AMS techniques for earth and human environmental research

Thu. May 1, 2014 11:00 AM - 12:45 PM 311 (3F)

Convener:*Toshio Nakamura(Center for Chronological Research, Nagoya University), Hiroyuki Matsuzaki(School of Engineering, The University of Tokyo), Kimikazu Sasa(Research Facility Center for Science and Technology, University of Tsukuba), Hisao Nagai(Faculty of humanities and Sciences, Nihon University), Masayo Minami(Center for Chronological Resarch, Nagoya University), Chair:Toshio Nakamura(Center for Chronological Research, Nagoya University)

Accelerator mass spectrometry (AMS) is a technique developed in 1977, to detect and count the small amount of nuclides in the environment, and to measure precisely the isotope ratios of the nuclides. In particular, by means of measuring rare radioisotopes in the environment, AMS techniques are applied for age measurement of samples from various application fields, such as geology, archeology and cultural properties. AMS can measure isotope ratios in the order of as low as 1.0E-10 to 1.0E-16, by the process of producing negative ions of specific nuclides by an ion source, accelerating the ions by a tandem accelerator, analyzing mass of the isotope ions by an analyzing magnet, and identifying the specific nuclides by an ionization detector. Thus AMS is used to measure isotope ratios of natural radionuclides of quite low natural abundances. AMS can be applied for studies of materials recycling and environmental science by using rare isotopes as a chemical tracer, and investigations of time sequence of tephra layers, land deposits, lacustrine and ocean sediments that are quite important for Quaternary research. This session offers a brief outlook of present status on technical progresses going on present days and interesting application programs, given by specific researchers and students engaged in AMS studies.

11:15 AM - 11:30 AM

[HTT35-09] 14C-based source apportionment of carbonaceous component in PM2.5 in Nagoya city

*Fumikazu IKEMORI1, Makiko YAMAGAMI2, Koji HONJYO3, Toshio NAKAMURA4 (1.Graduate School of Environmental Studies, Nagoya University, Nagoya City Institute for Environmental, 2.Nagoya University, Nagoya City Institute for Environmental, 3.Graduate School of Environmental Studies, Nagoya University, 4.Center for Chronological Research, Nagoya University)

12:00 PM - 12:15 PM

[HTT35-12] Cosmogenic 36Cl/10Be ratio in the Antarctic ice core during the last deglaciation and early Holocene

*Kimikazu SASA1, Kazuna KUROSUMI1, Keisuke SUEKI1, Tsutomu TAKAHASHI1, Yuki MATSUSHI2, Yuki TOSAKI3, Kazuho HORIUCHI4, Tomoko UCHIDA5, Hiroyuki MATSUZAKI6, Hideaki MOTOYAMA7 (1.University of Tsukuba, 2.Kyoto University, 3.National Institute of Advanced Industrial Science and Technology, 4.Hirosaki University, 5.Tohoku University, 6.The University of Tokyo, 7.National Institute of Polar Research)

12:30 PM - 12:45 PM

[HTT35-14] Distributions of radionuclides Cl-36 and I-129 in surface soils before Fukushima accident

*Keisuke SUEKI1, Jun-ichi KITAGAWA2, Kimikazu SASA1, Tsutomu TAKAHASHI1, Masumi MATSUKURA1, Norikazu KINOSHITA3, Yuki TOSAKI4, Yuki MATSUSHI5, Hiroyuki MATSUZAKI6 (1.University of Tsukuba, 2.High energy acclerator research organization, 3.Shimizu corporation, 4.The National Institute of Advanced Industrial Science and Technology, 5.Kyoto University, 6.The University of Tokyo)