Fusa MIYAKE

Associate Professor

Institute for Space-Earth Environmental Research, Nagoya University
Office for the Promotion of Transdisciplinary Network (OPTN) / Division for Cosmic-ray Research

cosmic ray physics, cosmogenic nuclide

We investigate past extreme solar events through high-temporal-resolution analyses of cosmogenic isotopes, such as carbon-14 in tree rings, and beryllium-10 and chlorine-36 in ice cores. We have identified signatures of these events, including the 774 CE and 993 CE events, as spikes in cosmogenic isotope data. Additionally, we explore on the application of these cosmogenic isotope spikes for achieving high-precision dating.

Masayo MINAMI

Office Manager・Professor

Institute for Space-Earth Environmental Research, Nagoya University
Office for the Promotion of Transdisciplinary Network (OPTN) / Division for Chronological Research / Center for International Collaborative Research / Office for the Development of Interdisciplinary Research Strategy

isotope geochemistry、carbon-14 dating

My research focuses on radioisotope-based geochronology and geochemistry, emphasizing the development of advanced sample preparation methods for precise and accurate carbon-14 dating of geological and archaeological samples. I also investigate paleoclimatic changes and environmental dynamics using stable isotopes as tracers. This includes creating isotopic geochemical maps for provenance studies and historical analyses. I aim to further promote collaboration with researchers from diverse fields, both domestically and internationally.

Minoru SAKAMOTO

Professor

National Museum of Japanese History / The Graduate University for Advanced Studies

Scientific research on cultural properties, radiocarbon dating

I am concerned with dating and interpreting historical and archaeological materials through radiocarbon. I am conducting radiocarbon dating of annual rings to refine a calibration curve based on Japanese trees while exploring techniques to enhance dating accuracy and precision. The current calibration curve, IntCal20, incorporates data collected by the National Museum of Japanese History, marking the first time that Japanese trees have been included.

Masataka HAKOZAKI

Associate Professor

National Institutes for the Humanities, National Museum of Japanese History

Environmental chronology, Dendrochronology, Carbon 14 dating, Cultural properties, Paleoecology, Archaeobotany

We are measuring annual ring width, oxygen isotope ratios, and carbon 14 with high precision on tree-rings of living trees, excavated woods from archaeological sites, old building materials, and naturally buried woods in Japan and other parts of the world to determine the ages of archaeological sites, old buildings, and natural disasters, reconstruct paleoenvironment, restore solar activity, and construct basic data for dating.

Fuyuki TOKANAI

Professor

Center for Accelerator Mass Spectrometry, Yamagata University

Astrophysics, Nuclear physics, Accelerator mass spectrometry, Carbon 14 dating

In 2009, Yamagata University (YU) installed a compact accelerator mass spectrometry (YU-AMS) system and an automated graphitization line dedicated to 14C measurement. Currently, we have been studying for in various fields, such as archaeology, environmental science, geology, and space and earth sciences using the YU-AMS system.