2 0 0 0 算数・数学の連続性についての研究 : -文字式に関する一考察-
- 著者
- 鈴木 和博 Suzuki Kazuhiro 中村 俊夫 Nakamura Toshio 加藤 丈典 Kato Takenori Takenori 池田 晃子 Ikeda Akiko 後藤 晶子 Goto Akiko 小田 寛貴 Oda Hirotaka 南 雅代 Minami Masayo 上久保 寛 Kamikubo Hiroshi 梶塚 泉 Kajizuka Izumi 足立 香織 Adachi Kaori 壺井 基裕 Tsuboi Motohiro 常磐 哲也 Tokiwa Tetsuya 太田 友子 Oota Tomoko 西田 真砂美 Nishida Masami 江坂 直子 Esaka Naoko 田中 敦子 Tanaka Atsuko 森 忍 Mori Shinobu ダンクリー ダニエル Dunkley Daniel J. クシャク モニカ Kusiak Monika A. 鈴木 里子 Suzuki Satoko 丹生 越子 Niu Etsuko 中崎 峰子 Nakazaki Mineko 仙田 量子 Senda Ryoko 金川 和世 Kanagawa Kazuyo 熊沢 裕代 Kumazawa Hiroyo
- 出版者
- 名古屋大学年代測定資料研究センター
- 雑誌
- 名古屋大学加速器質量分析計業績報告書
- 巻号頁・発行日
- vol.19, pp.26-38, 2008-03
Umi is located along the Kamimura River within the Kamiyahagi area of southeastern Ena City, Gifu Prefecture. The name 'Umi' means sea or large lake; however, there are no lakes in the mountainous Kamiyahagi area. The Tokai Gou (torrential rain) flood of September 11-12, 2000 destroyed embankments along the river, and exposed sedimentary layers that are typical of a lacustrine depositional setting. This confirms the existence of a paleo-lake from which the name Umi originated. The ^<14>C ages, ranging from 280±37 to 345±25 BP, appear to be contemporaneous with Tensho Earthquake that occurred in central Japan on January 18, 1586.
1 0 0 0 IR 鉄サビの放射性炭素年代測定のための基礎実験(II)
- 著者
- 中村 俊夫 太田 友子 山田 哲也 Nakamura Toshio Ohta Tomoko Yamada Tetsuya
- 出版者
- 名古屋大学年代測定資料研究センター
- 雑誌
- 名古屋大学加速器質量分析計業績報告書
- 巻号頁・発行日
- vol.26, pp.150-155, 2015-03
It is well known that ages of ancient iron artifacts can be measured by using carbon contained in the iron artifacts. As a simple method of carbon extraction from iron artifacts, a normal quartz tube is used for metal iron combustion at the temperature of 1000℃ for about 15 hrs. We tested the quartz tube method of metal iron combustion successfully for metal iron in fine fragment forms and reported the results previously. In Japan, iron rust samples are commonly excavated from archeological sites of the Kofun period and after. We have tested to collect carbon from iron rust samples successfully by the quartz tube method of iron-rust combustion at 850℃ for 3 hr. We have experienced that quartz tubes were broken twice during combustion: at 900℃ for 8 hr and at 850℃ for 3 hr. 14C age, 524±25 BP, was obtained for an iron rust sample from a ruin of Fe manufacturing site worked at 1850s in Saga city, Saga Prefecture, Japan. The 14C age was too old compared with the estimated age of the site. 14C ages were also obtained for three rusty nail samples as 2949 -3244 BP. The results suggested a possibility of modern carbon contamination in considerable amount during rust process of metal iron that was produced by using coal as a heating fuel as well as material to reduce iron oxide ore.名古屋大学年代測定総合研究センターシンポジウム報告