C04_P03

Radiocarbon ages of annual tree rings collected in Korea (AD 900 - 2021, 81 - 168, 131 - 211)

Hong W¹, Park Y¹, Sung K¹, Park G¹, Sakamoto M², Hakozaki M², Park J¹

¹Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, South Korea, ²National Museum of Japanese History, Sakura City, Japan

Radiocarbon ages of annual tree rings collected in Korean Peninsula were measured using KIGAM 1MV AMS. All samples were treated by alpha cellulose extraction methods at KIGAM and NMJH. Reduction process of CO₂ to graphite was done using 24-line automatic reduction system at KIGAM. The radiocarbon ages from AD 1250 to 1850 were reported in 2013 (Hong et al.1, 2013 and Hong et al.2, 2013) with dendrochronological ages. After the reports, radiocarbon ages of tree rings from AD 1093 to 1162, AD 1188 to 1249, and AD 1851 to 1950 have been measured. The calendric ages of these samples were determined by dendrochronology or oxygen isotope patters. And recently, additional tree rings from AD 81 to 168 and from AD 131 to 211 collected from an archaeological site, Gochon-ri, were measured. The calendric ages of the samples were determined by oxygen isotope dendrochronology. Modern tree rings after AD 1950 collected from a mountain called Sogri-san, which is located in the center of South Korea, were also measured up to 2021. Those ages will be reported in this presentation and compared with IntCal13 and IntCal20 curves. Chronological variation of regional offsets in the radiocarbon ages of tree rings grown in East Asia from IntCal13 and IntCal20 will be discussed.