Calibration of 14C ages to calendar years according to annual-year-based 14C data and its application to wiggle matching

2016 Fiscal Year Final Research Report

• Project/Area Number: 26284120
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Archaeology
• Research Institution: Nagoya University
• Principal Investigator: Nakamura Toshio 名古屋大学, 宇宙地球環境研究所, 招へい教員 (10135387)
• Co-Investigator(Kenkyū-buntansha): 箱崎 真隆 国立歴史民俗博物館, 研究部, 助教 (30634414) ; 増田 公明 名古屋大学, 宇宙地球環境研究所, 准教授 (40173744) ; 南 雅代 名古屋大学, 宇宙地球環境研究所, 准教授 (90324392)
• Co-Investigator(Renkei-kenkyūsha): OKUNO MITSURU 福岡大学, 理学部, 教授 (50309887)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 放射性炭素 / 放射性炭素年代測定 / 年輪年代 / 樹木年輪 / 暦年代較正 / 放射性炭素濃度の経時変動 / 放射性炭素濃度の地域変化 / 加速器質量分析

Outline of Final Research Achievements

We have measured the 14C ages of annual rings from several Japanese trees, and compared the tree-ring 14C ages with the corresponding 14C ages of IntCal13 datasets. It was revealed that the 14C ages of the annual rings of Japanese trees are not consistent with those of the IntCal13 in some instances. Many cases of 14C ages of tree rings are older than those of IntCal13, but younger than those of SHCal13 datasets. This suggests that calibration of the 14C dates of Japanese samples with IntCal13 induces additional systematic shifts of calibrated ages toward older ages by about 10-30 yr compared with the sample optimum calendar ages. To overcome this problem, first of all, we need to collect high quality 14C age data for Japanese samples.

Free Research Field

文化財科学