The estimation of origin of feed materials for archeological and cultural property iron with an indicator of trace elements

用新研制的能量色散X射线分析仪测定钢铁中的砷和锑，在几ppm的浓度水平上具有较好的精密度。用该仪器对江户时代的铁钉进行了X射线荧光分析和其他化学分析、原子吸收光谱、激光电感耦合等离子体质谱和中子活化分析。通过对这些分析结果的比较，估计铁钉的性质是不均匀的。分析了镰仓至江户时代东宗寺所用的铁钉。以As/Sb浓度比为指标，将这些钉的原料来源分为五类。

It was found that arsenic and antimony in iron and steel were determined with a good precision at a few ppm of concentration level by using of a new developed energy dispersive X-ray analyzer. Iron nails of the Edo era were analyzed by an X-ray fluorescence analysis with this analyzer and other chemical analysis, an atomic absorption spectrometry, a laser ICP mass spectrometry and a neutron activation analysis. It was estimated by a comparison of these analytical results that the property of the iron nails was heterogeneous. The iron nails used for Toji temple at the Kamakura to Edo era were analyzed. As a results, the origin of feed materials for these nails were divided into five groups by the indicator of As/Sb concentration ratio.