放射性炭素年代法では，測定値である炭素14年代を較正曲線に基づいて暦上の年代に修正する必要がある。北半球の陸域資料に適用されるIntCal較正曲線は，主に欧米産樹木年輪資料に基づいて整備されてきたが，福井県水月湖の年縞堆積物や，IntCal20で採用された日本産樹木年輪など，日本における研究も大きな役割を果たしている。最新の較正曲線IntCal20に至る経緯を，日本での取り組みを中心に概説する。
In radiocarbon dating, it is necessary to correct the measured radiocarbon ages to calendar ages based on a calibration curve. The IntCal calibration curve applied to terrestrial materials in the Northern Hemisphere has been developed mainly on the basis of tree ring materials from Europe and the United States, but research in Japan has also played a major role, such as the varved sediment of Lake Suigetsu, Fukui Prefecture, and the Japanese tree rings used in IntCal20. The history of the latest calibration curve IntCal20 is outlined, focusing on the efforts made in Japan.
Key words: radiocarbon dating; dendrochronology; calibration curve; Japanese tree rings; regional effect
© Japan Radioisotope Association 2024. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)© Japan Radioisotope Association 2024. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)
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