A Study on Accurate Radiocarbon Dating of Ancient Cultural Properties with Accelerator Mass Spectrometry

加速器质谱法对古代文物进行准确放射性碳测年的研究

基本信息

批准号：
05835006
负责人：
NAKAMURA Toshio
金额：
$ 1.22万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05835006/
关键词：
cultural properties age measurement radiocarbon dating accelerator mass spectrometry tandem accelerator correction for isotopic fractionation calibration to calendar year ancient documents 樹木^<14>C濃度の経年変動

项目摘要

This study focussed on some basic problems to attain a high accuracy radiocarbon dating of ancient cultural properties and documents, by using a Tandetron accelerator mass spectrometer of the Dating and Materials Research Center, Ngaoya University.As a first step, a sample preparation method was developed to produce graphite from Co_2, using Fe as a catalyst and H_2 as a reducer. When a graphitized sample is used, carbon amount necessary for one measurement was reduce to 1 mg, and one sigma errors of ^<14>C dates to <plus-minus>40 years. It proved that the sample graphitization is indispensable for ^<14>C dating of cultural properties with rather limited sample amount available. As a second step, we have established a procedure to obtain a more accurate ^<14>C dates by correcting the effect of carbon isotopic fractionation of carbon samples.Repoducibility tests are conducted for several graphite materials prepared from each ancient cultural sample. The tests indicated that ^<14>C measurements should be repeated more than 3 times to get a highly reliable results. In addition, a program for calibration from ^<14>C date to calendar year, developed using dendrochronology of wood samples grown mainly in North America and Europe, has been applied successfully to the Japanese samples.Radiocarbon dating was conducted for some Japanese cultural-property samples, such as old paper documents, document container boxes, wooden statues, ancient iron swords, iron statues, silk cloth samples, ancient ship fragments, old bone samples, etc. The calendar years of those samples, estimated by calibrating the ^<14>C dates measured with a Tandetron AMS,are consistent with historical estimations. The radiocarbon dating is also proved to be useful to figure out imitations.

这项研究的重点是通过使用Tandetron加速器的质谱仪和材料研究中心的Tandetron Accelerator质谱仪，以实现高精度的放射性碳测定，NGAOYA大学。作为第一步，开发了一种示例准备方法，以使用Co_2生产Co_2的示例制备方法，使用Fe as a catalyst and catalyst and H_2和H_2 As Reducers as a reducers as a reducers as a reducers as a reducers as a reducer。当使用石墨样品时，一个测量值所需的碳量减少至1 mg，一个Sigma误差为 ^<14> c的日期为<plus-minus> 40年。事实证明，对于文化特性的 ^<14> c年代的样本石墨化是必不可少的，可用的样本数量相当有限。作为第二步，我们已经建立了一种程序，通过纠正碳样品的碳同位素分馏的效果来获得更准确的 ^<14> C日期。对从每个古代文化样本制备的几种石墨材料进行了可调性测试。测试表明 ^<14> C测量应重复超过3次，以获得高度可靠的结果。 In addition, a program for calibration from ^<14>C date to calendar year, developed using dendrochronology of wood samples grown mainly in North America and Europe, has been applied successfully to the Japanese samples.Radiocarbon dating was conducted for some Japanese cultural-property samples, such as old paper documents, document container boxes, wooden statues, ancient iron swords, iron statues, silk cloth samples, ancient ship fragments, old bone样品等。这些样品的日历年是通过校准用Tandetron AMS测量的 ^<14> C日期估算的，与历史估计一致。放射性碳年代也被证明可用于弄清模仿。