High-precision radiocarbon measurements of the Japanese cedar tree-rings from Yaku Island formed in the 5th century

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  • 紀元5世紀の屋久杉年輪試料をもちいた高精度放射性炭素年代測定

Abstract

Radiocarbon (14c) dating method has contributed to the age determination of specimens of the past 50,000 years in geology and archaeology. However, since 14C date is not in agreement with the calendar year, the calibration using a dataset which consists of 14C data of calendar year known samples is required for it. Moreover, there is regional difference of 14C concentration in the atmosphere (regional 14C offset), and therefore, in order lo be high-precision calibration, the dataset for each area needs to be established. The Center for Chronological Research (CCR), Nagoya University has measured 14C data of the tree-ring samples of a Japanese cedar from Yaku Island in Southern Japan, in order to establish a calibration dataset for Japan. This report shows the measurement result of the tree-ring samples of that tree formed in the 5th century. Thirty five 14C dates of the tree-ring samples showed that it will be older than IntCal13 for an average of 35 ± 22 year. These 14C dates were mostly located in the middle of IntCal13 and SHCal13. This measurement result might suggest that 14C concentration in the atmosphere of the Japanese neighborhood fell in the 5th century, and the atmospheric supply from the Southern Hemisphere may have become strong. Sakamoto et al. (2013) measured the tree-ring samples formed in the 5th to 6th century of a Japanese cedar tree from Nagano Prefecture in Central Japan, and they reported that them 14C dates are older than IntCal13. Our result accord with their study, and therefore, at that time can consider a possibility that the influence of the Southern Hemisphere atmosphere had reached to Central Japan.

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