Radiocarbon Calibration Using Japanese Wood Samles

使用日本木材样品进行放射性碳校准

基本信息

批准号：
09301017
负责人：
SAHARA Makoto
金额：
$ 22.27万
依托单位：
National Museum of Japanese History
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Although the universal calibration curvcs have been widely used for radiocarbon dating of Japanese sarnples and should be suitable for practical use, it is necessary to establish its basis of correctness. To improve this situation we have performed precise 14C calibration using dendrochronologically dated tree-rings of cedars and cypresses. We focused on the ages between 350 BC and AD 900, in particular the prehistoric era called the Yayoi Period and the proto-historic era known as the Kofun Period in the history of Japan.The tree ring samples used in this study are specimens from Japan Cedar (Sugi) trees, incluchng bog-woods from Hakone (HK series, 240BC-AD200) and Miyata-Mura, Nagano Pref. (MT, AD330-AD630) and timbers cxcavated at the Hotta-no-Saku Site, Akita Pref. (AHI, AD690-AD800 ; AH3', AD660-AD900). The dendro-dates were determined by comparison of the standardized ring patterns with the master chronology at the Nara National Cultural Properties Research Institutc. The specimens were cut into decadal pieces, pulverized to fine fiber tips, processed by a conventional acid-base-acid treatment, and finally extracted as cellulose. The cellulose was oxidized into carbon dioxides, which were then purified and converted into graphite. For most of the samples 14C was measured by AMS at Gronningen University.The result shows that they are generally in good agreements with the INTCAL98 data, which are based on the European and North Arnerican woods. However, we have to reserve a possibility that several 1 4C data may show a small deviation from INTCAJ_98 at certain years. Wiggle-matching gives almost exactly the dendro-dates, and the differences being only a fcw years. Good agreements are also found for cypress (Hinoki) tree-rings from the lkegarni-Sone Site, Osaka Pref. These rcsults confirm for the first tiITLe the correctness of using INTCAL98 for Japanese samples. The results will be presented at Intcrnational Radiocarbon Conference in Israel (June, 2000).

虽然通用校准曲线已广泛用于日本样品的放射性碳测年，并应适合实际使用，但有必要建立其正确性基础。为了改善这种情况，我们使用雪松和柏树的年轮进行了精确的 14C 校准。我们关注的是日本历史上公元前350年至公元900年之间的时代，特别是史前时代“弥生时代”和原始历史时代“古坟时代”。本研究中使用的树木年轮样本来自日本雪松（Sugi）树，包括来自箱根（HK系列，公元前240年-公元200年）和长野宫田村的沼泽树林首选。（MT，AD330-AD630）和在秋田县堀田之作遗址挖掘的木材。（AHI、AD690-AD800；AH3'、AD660-AD900）。树突年代是通过将标准化的年轮图案与奈良国立文化财产研究所的主年表进行比较来确定的。将样品切成十年碎片，粉碎成细纤维尖，通过常规酸-碱-酸处理进行处理，最后提取为纤维素。纤维素被氧化成二氧化碳，然后将其纯化并转化为石墨。对于大多数样品，14C 是由格罗宁根大学的 AMS 测量的。结果表明，它们与基于欧洲和北阿纳里加木材的 INTCAL98 数据基本吻合。然而，我们必须保留一种可能性，即某些年份的几个 1 4C 数据可能与 INTCAJ_98 存在微小偏差。摆动匹配给出了几乎完全相同的树果日期，并且差异仅是 fcw 年。大阪府 lkegarni-Sone 遗址的柏树（Hinoki）年轮也有良好的协议。这些结果首先证实了对日本样本使用 INTCAL98 的正确性。结果将在以色列举行的国际放射性碳会议上公布（2000 年 6 月）。