Departmental Bulletin Paper 平成27(2015)年度第28回宇地研年測シンポジウム開催の趣旨および経過

中村, 俊夫  ,  NAKAMURA, Toshio

27pp.3 - 10 , 2016-03 , 名古屋大学宇宙地球環境研究所年代測定研究部
The 28th symposium on age measurements with AMS (accelerator mass spectrometry) and EPMA (electron probe micro analyzer) systems, as well as their applications to geological and archeological samples, was opened on January 28th-29th, 2016, at Nagoya University. Symposium of this kind has been held every year generally as an opportunity for users' meeting to publicize their results obtained by utilizing the age-measurement facilities of the Division of Chronological Research, Institute for Space-Earth Environmental Research, Nagoya University. The institute was re-organized by merging three research divisions: (1) Solar Terrestrial Environmental Research; (2) Institute for Hydrospheric and Atmospheric Research; (3) Center for Chronological Research. This symposium has been organized by the previous Center for Chronological Research for 27 years. In this symposium, the status reports of the AMS and EPMA systems were delivered. In addition, a special lecture, and two state-of-art invited lectures as for the topics using the AMS as well as EPMA systems of our division were presented. A poster report was also presented as the results of the program of the innovation of new technology and research for young scientists. A special lecture, given by Prof. Toshio Nakamura, was entitled as "Recent development of techniques of accelerator mass spectrometry and its expanding applications". He summarized briefly the history of research on AMS in Japan lasting from 1979 to present and discussed future prospective of AMS techniques. Next, two invited lectures were presented at the symposium: the first talk was entitled "Possible early Archaean biosphere interpreted from ca. 3.8 Ga Isua rocks, West Greenland", presented by Dr. Yoko Ohtomo from Graduate School of Engineering, Hokkaido University. She visited the Isua province, Greenland, to look for graphite layer in the sedimentary rocks. The graphite should be a relic left by living things of 3.8 billion years ago. She successfully found the graphite and brought it to Japan, and investigated its origin by an optical microscope, an electric microscope and carbon isotope ratio analysis. The results will be summerized as a report in this proceeding book. The second talk entitled "Seasonal characteristics of aerosol PM2.5 collected in Noto Peninsula" was given by Professor Atsushi Matsuki, the Institute of Nature and Environmental Technology, Kanazawa University. He studies aerosol, a hazardous atmospheric particles to human bodies, collected at a local city, Wajima, far from big urban cities, in focusing on such elemental processes as: (1) continuous measurements of concentrations, and some other aspects of the PM2.5 particles; (2) evaluation of specific cloud formation character of aerosols; (3) investigation of origins of carbonaceous fractions of PM2.5. The detail results will be described in the manuscript in this proceedings book. Totally 21 oral reports and 7 poster reports were presented as contribution papers concerning the results on applications of the AMS as well as EPMA systems of the CCR. The fields of such applications are: study on solar activity based on 14C concentrations of tree rings; preparation water samples for 14C content measurements; 14C dating analysis of charcoal and bone samples from archeological and cultural property samples; 14C dating study of archeological bronze artifacts; geological applications of 14C dating, including cored samples from Hokkaido; 14C dating application to cultural properties such as old Japanese swords and mortal materials; studies on 14C calibration with Japanese wood; technical developments of sample preparation for 14C measurements; CHIME dating of monazite; technical study on CHIME dating for sub-micron sized samples. Finally, it should be noted that general participants who are not a specialist of age measurements or applications also joined the discussion and hopefully enjoyed it.

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