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$$^{14}$$C実験室間の比較研究; 名古屋大学と原子力機構むつAMSシステム

An Inter-laboratory comparison study on $$^{14}$$C measurements between two AMS laboratories of Nagoya University and JAEA Mutsu

中村 俊夫*; 田中 孝幸; 甲 昭二; 太田 友子*

Nakamura, Toshio*; Tanaka, Takayuki; Kabuto, Shoji; Ota, Tomoko*

AMSによる$$^{14}$$C年代測定の研究室間比較研究を名古屋大学と原子力機構で行った。使用した考古学試料は、2種類であり、山梨県韮崎市教育委員会より提供された。1つは、年代既知の炭化米であり、新府城跡から採取された。この試料は、武田勝頼が1582年に、織田・徳川連合軍との戦により、火を放ち落城させた際、炭化した米である。もう一方の試料は、宿尻第二遺跡より採取された桃の種子及びオニグルミの殻の炭化物である。これらの試料での2研究室におけるAMSによる$$^{14}$$C年代測定の結果は、統計誤差内でよく一致していた。また、年代既知の炭化米の較正年代は、新府城が落城した年代と一致していた。

An inter-laboratory comparison of $$^{14}$$C dating studies with AMS were performed between Nagoya University and JAEA. Two kinds of archeological samples used for the intercomparison were offered from the Education Board of Nirasaki city. One part of them was a charred rice sample with known historical age, which was collected from the ruin of Shimpu-Jo castle remains. The rice was charred when the castle was burnt in 1582, when the castle was abandoned by Katsuyori Takeda during the battle against the combined military forces of Oda and Tokugawa families. The other samples were charred pyrenes of peach and nutshells of Japanese walnut collected from the Shukujiri-Daini-Iseki archeological site. The results from the two AMS laboratories were quite consistent within statistical uncertainties. In addition, calibrated $$^{14}$$C ages for the charred rice samples were also consistent with the historical age when the Shimpu-Jo castle was burnt down.

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