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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., 名古屋大学宇宙地球環境研究所年代測定研究部シンポジウム報告

The 27th 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 27th-28th, 2015, at Nagoya University. Symposium of this kind is held every year generally as an opportunity for users' meeting to publicize their results in utilizing the age-measurement facilities of the Center for Chronological Research (CCR), Nagoya University. In the symposium, the status reports of the AMS and EPMA systems were delivered firstly. Then, two reports were presented as the results of the program of the innovation of new technology and research for young scientists. Two special lectures were presented at the symposium: the first talk was entitled "Iron manufacture and circulation of iron products in ancient period on Japanese archipelago", given by Dr. Ryuhei Maruyama who retired from Faculty of Literature, Nagoya Women's University in 2009. He described a brief history on Japanese iron manufacturing and utilizing iron products in ancient period, and estimated that the first iron manufacture was conducted in the end of 6 century. The second talk entitled "The emplacement age of the Hikami granite, 440 Ma or 350 Ma? - A way to interpret incompatible age data" was given by Emeritus Professor Kazuhiro Suzuki who has retired from the Center for Chronological Research in 2012. He reviewed age data measured by K-Ar, CHIME, SHRIMP, Rb-Sr whole-rock isochron and LA-ICPMS U-Pb methods, and concluded that the southern Kitakami terrain is a Jurassic melange with granite, Silurian sediment and Devonian sediment as exotic blocks. This new concept will be submitted to the report in 2015 after further verification. Totally 22 oral reports and 3 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 application are: study on solar activity based on 14C concentrations of tree rings; environmental applications, including human tooth analysis with 14C tracer; 14C dating analysis of charcoal and bone samples from archeological and cultural property samples; 14C dating study of paper documents; geological applications of 14C dating, including cored samples from Hokkaido; 14C dating application to cultural properties and archeological samples; 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 specialist of age measurements also joined the discussion and hopefully enjoyed it.

We have organized the 26th 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, on January 28th-29th, 2014, at Nagoya University. Symposium of this kind is held every year generally as an opportunity for users' meeting to publicize their results in utilizing the age-measurement facilities of the Center for Chronological Research (CCR), Nagoya University. In the symposium, the status reports of the AMS and EPMA systems were delivered firstly. Then, three reports were presented as the results of the program of the innovation of new technology and research for young scientists. Four special lectures were presented at the symposium: the first talk was entitled "A survey aimed for preservation of El-Zayyan Temple site in Kharga Oasis, Western Desert of Egypt", given by Mr. Toshio Tukamoto of Gangoji Institute for Cultural Properties, about an environmental and cultural investigation of flourishing days of Kharga Oasis in the Roman period. Refinements of buildings at El-Zayyan Temple have been performed several times in the past days. In order to trace the refinements in the past, he surveyed the area around the Temple by three-dimensional digital measurements, the area of the half broken buildings and geographical mapping of the surrounding areas. The Kharga Oasis had been a farm belt and produced a plenty of wine in Roman period. It is interesting to study how environmental change has occurred from the flourishing Roan period to the present-day dry weather of poor vegetation. He is continuing investigation of the present weather condition by using modern compact thermometers and humidity sensors. He has presented us a lot of experience during the survey. The second was a talk given by Mr. Iwao Nishida of the Saga-City board of Education, entitled "Environment and culture at early Jomon period -the real situation of Jomon culture revealed from the complete investigations of Higashimyo archeological site". He first described the natural history of the site, staring from around 8000 cal BP and ending at around 7800 cal BP, lasting for about 200 years, in the period just before maximum sea level. During the excavations of shell middens, a lot of remains of shell, plants, nuts, bones were detected. Also, many man-made tools, such as basket, oar, pottery, stone tools, wooden comb, etc., were excavated. He showed us how the life of Jamon people were rich in their daily lives as old as 8000 years ago. The third was a talk about the geology of Antarctica given by Professor Tomokazu Hokada of National Institute of Polar Research. So far, he has measured ages of a lot of rocks and minerals from Antarctica, by using a high-resolution mass spectrometer called SHRIMP, and established a detailed chronology of Antarctic rocks. He explained us chronological frameworks of Antarctic continent based on his chronological investigations. The fourth was a keynote lecture of the special session concerning chronological study of ancient documents based on 14C dating, given by the president of Aichi Bunkyo University. He is a top-level researcher on ancient documents and he sometimes encounters the case of the real or fake decision of ancient documents. Some researchers do not rely on 14C dating at all, but the President Masuda considers it necessary to do collaboration between relevant techniques of natural and social sciences, in particular, AMS 14C dating as a natural science. He reviewed his more than 20 years experience of collaboration with natural science in the study of ancient documents. Totally 34 oral reports and 8 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 application are: study on solar activity based on 14C concentrations of tree rings; environmental applications of 14C tracer; 14C dating analysis of stalactite from a limestone cave near Lake Hamana in Shizuoka prefecture; geological applications of 14C dating; 14C dating application to cultural properties and archeological samples; studies on 14C calibration with Japanese wood; technical developments of sample preparation for 14C measurements; measurements of U-Th-Pb ages for monazite from geological rock samples; technical study on CHIME dating for sub-micron sized samples. Finally, it should be noted that general participants who are not specialist of age measurements also joined the discussion and hopefully enjoyed it.

We have organized the 24th 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, on January 16thー17th, 2013, at Nagoya University. Symposium of this kind is held every year generally as an opportunity for users' meeting to publicize their results in utilizing the age-measurement facilities of the Center for Chronological Research (CCR), Nagoya University. In the symposium，the status reports of the AMS and EPMA systems were delivered firstly. Then, three reports were presented as the results of the program of the innovation of new technology and research for young scientists. Four special lectures were presented at the symposium: the first talk was entitled “ 14C age calibration and varve sediments from Lake Suigetsu", about a refinement of 14C age calibration data sets by using a new relationship between varve chronology and 14C age chronology established by using the Lake Suigetsu varve sediments, given by Prof. Hiroyuki Kitagawa, Graduate School of Environmental Studies, Nagoya University. He has started his work on 14C dating of varve sediments from Lake Suigetsu since 1991. He has already published his work on the relation between 14C and varve chronologies in the journal “ Science". However, he was not certain that he had counted varve numbers correctly in the sediments. He explained the difference in varve counting between his own data and newly published data by Bronk Ramsey et al. (2013). His talk was quite suggestive in understanding 14C age calibration to obtain unbiased age from biased 14C ages. The second was a talk given by Prof. Kimiaki Masuda of Solar Terrestrial Laboratory, Nagoya University, entitled “ 14C production rate modulated by cosmic rays: abrupt increase of 14C concentration of tree rings in Nara period". His group has measured 14C concentrations of individual annual rings of trees grown from AD 1st century to recent year, and a sudden increase of 14C concentration was detected in the year of 774. This phenomenon can be related to a supernova explosion or gigantic solar flare activities. The study was reported in the journal “'Nature" (Miyake et al. 2013). The third was talk about the underwater excavation at Takashima, Nagasaki prefecture, a site famous for Mongol Inversion in 1274 and 1281, by Mr. Atsuyuki Tanaka of the education board of Matsuura city, Nagasaki prefecture. He explained a lot of archeologica1 remains excavate at the site，and gave us information that the Takashima and Kanzaki areas have been designated to historical site by the Japanese Government in 2012. The fourth was a talk of the study on formation and development of rice farming technologies in East Asia area by using a special technique based on plant opal identification. He has done extensively filed researches on rice farming ruins in China and Japan. He explained present understandings about formation and development of rice farming from the area of Yangtze River to east of China, Korean peninsula and finally to Japanese islands. Totally 29 oral reports and 8 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 application are: study on solar activity based on 14C concentrations of tree rings; environmental applications of 14C tracer; geochemical analysis of deep sea water samples surrounding calcium carbonate rocks; geological applications of 14C dating; 14C dating application to cultural properties and archeological samples; studies on 14C calibration with Japanese wood; technical developments of sample preparation for 14C measurements; measurements of U-Th-Pb ages for monazite from geological rock samples in India; technical study on CHIME dating for sub-micron sized samples. Finally, it should be noted that general participants who are not specialist of age measurements a1so joined the discussion and hopefully enjoyed it., 名古屋大学年代測定総合研究センターシンポジウム報告

We have organized the 24th 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, on January 13th-14th, 2012, at Nagoya University. Symposium of this kind is held every year generally as an opportunity for users' meeting to report their results in utilizing the age-measurement facilities of the Center for Chronological Research (CCR), Nagoya University. In the symposium, the status reports of the AMS and EPMA systems were delivered firstly. Then, two reports were presented as the results of the program of the innovation of new technology and research fur young scientists. Three special lectures were presented at the symposium: the first was a memorial talk on the CHIME dating method established by a geology group at Nagoya University, given by Prof. Kazuhiro Suzuki of the CCR, Nagoya University. The second was a lecture given by Prof. Mineo Imamura, an Emeritus Professor of National Museum of Japanese History, entitled "High precision dating method applied in archeology and its prospects". The third was a talk about the excavation program conducted at the graveyard sites in Lebanon, entitled "The conservation project of underground tomb with wall painting in Burj al Shamali, Tyre, Lebanon", by Prof. Yoichi Nishiyama of Nara University. The lectures were quite impressive and contained important applications concerned with age measurements, and were quite suggestive in developing new applications in this area. Totally 26 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 application are: study on solar activity based on l4C concentrations of tree rings; environmental applications of 14C tracer; geochemical analysis of deep sea water samples surrounding calcium carbonate rocks; geological applications of 14C dating; l4C dating application to cultural properties and archeological samples; studies on 14C calibration with Japanese wood; technical developments of sample preparation for l4C measurements; study on the source of Pb contained in the aerosol preserved in the lake sediment; measurements of U-Th-Pb ages for monazite from geological rock samples in the Himalaya Mountains and near-by regions; technical study on CHIME dating for sub-micron sized samples. Finally, it should be noted that general attendants who are not specialist of age measurements also participated in the discussion and hopefully enjoyed it.

We have organized the 23rd 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, on January 13th-14th, 2011, at Nagoya University. Symposium of this kind is held every year generally as an opportunity for users' meeting to report their results in utilizing the age-measurement facilities of the Center for Chronological Research (CCR), Nagoya University. In the symposium, the status reports of the AMS and EPMA systems were delivered firstly. Then, two reports were presented as the results of the program of the innovation of new technology and research for young scientists. Three special lectures were presented at the symposium: the first was a memorial talk on the early stage of 14C-AMS studies at Nagoya University, given by Prof. Toshio Nakamura of Nagoya University. The second was a lecture given by Prof. Shiji Aoki of Tohoku University, entitled as "Analysis of stratospheric air collected with balloon-borne cryogenic-air-sampling system: Latest results". The third was a talk about his 45-year relations to 14C dating, entitled "Geochronology of glacial geomorphology in Antarctica and coral reef geomorphology of Nansei Islands, SW Japan: Results of 14C dating for 45 years since 1966". The lectures are quite impressive and important applications concerned with age measurements, and quite suggestive in developing new application fields in this area. Totally 21 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 application are: study on solar activity based on 14C concentrations of tree rings; environmental applications of 14C tracer; geological applications of 14C dating; 14C dating application to cultural properties and archeological samples; investigation on removal of PEG reagent from wooden materials with conservation treatment by PEG; 14C analysis of aerosol materials collected in Nagoya city, to estimate the contribution from fossil fuel; U-Th-Pb ages of monazite from metamorphic rocks in the Himalaya Mountains, Nepal. Finally, it should be noted that general attendants who are not specialist of age measurements also participated in the discussion and hopefully enjoyed it., 第23回名古屋大学年代測定総合研究センターシンポジウム平成22(2010)年度報告

We have organized the 22^nd 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, On January 14^th, 2010, at Nagoya University. Symposium of this kind is held every year generally as an opportunity for users' meeting to report their results in utilizing the age-measurement facilities of the Center for Chronological Research (CCR), Nagoya University. In the symposium, the status reports of the AMS and EPMA systems were delivered firstly. Then, two reports were presented as the results of the program of the innovation of new technology and research for young scientists. Two special lectures were delivered at the symposium; one was about investigations on the early stage of pasturage, farming and civilization at the archeological sites in Syria and Iran, given by Prof. Akira Tsuneki from University of Tsukuba. The other was a lecture given by Prof. Tsuyoshi Tanaka of Nagoya University, on the research about extra-terrestrial materials on earth, which were produced before the formation of the earth. Both lectures are important applications concerned with age measurements, and quite suggestive in developing new application fields in this area. Totally 16 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 application are: study on in situ production of ^C atom in quartz crystal by cosmic rays; environmental applications of ^C tracer; geological applications of ^C dating; ^C dating application to bone age analyses, to analysis on production ages of historical kilns for ceramics, to chronological analysis of wooden circular structures at the Mawaki site, Ishikawa prefecture; insects assemblage analysis for the sediments and archeological remains from the historical sites; U-Pb ages of zircon crystals from metamorphic rocks in the Himalaya Mountains, Nepal. Finally, it should be noted that general attendants who are not specialist of age measurements also participated in the discussion and enjoyed it., 第22回名古屋大学年代測定総合研究センターシンポジウム平成21(2009)年度報告