A study about ancient iron production using radiocarbon dating -Toward elucidation of an actual grasp of a manufacturing process of an ancient iron products-

本研究通过利用古代炼铁方法的炼铁实验，有效收集了实验提供的铁矸石和生铁中固有的碳以及实验中使用的木炭，并利用加速器质谱法进行了14 C年龄测定。结果表明，炭的年龄与使用前炭的年龄基本一致，铁制品中的碳的历史考察表明，它来自炼铁时使用的炭。在作为铁制品形成过程之一的精锻中，铁制品的年龄值已被证实有其所使用的木炭的影响。通过这些研究结果，铁废料和铁块的碳历史有待于在铁中挖掘-制造场所和精炼铁匠场所来自生产中使用的木炭，能够确认合法性和然而，在对同一铁制品内部进行14 C年龄测量时，观察到几个样品的年龄值的分散性超过测量误差。关于这些样品的离散性，我们认为是取样方法和取样位置以及样品生锈造成的碳污染的可能性造成的。为了解决这个年龄值的离散性问题，关于取样方法或样品生锈造成的碳污染的影响的检查是未来的问题。此外，为了更好地检测物质，开发高效提取每一个古老制造过程中发生的产品中的碳和副产品中的碳的方法，并对其进行提纯是必不可少的。

In this study, through the iron manufacture experiment that used an ancient iron manufacture method, the efficiency collected the carbon which was inherent in iron refuse and pig iron provided by the experiment and the charcoal which it used in this case and did the 14 C age measurements by accelerator mass spectrometry method. The result shows the age that is almost same as charcoal before use, the history of carbon in an iron product inspected that it came from charcoal used in case of iron manufacture. In refinement blacksmithing that was one of process for forming of an iron product, the age value of the iron product has verified to have it the charcoal that was used then influenced.By these study result, a carbon history of iron refuse and iron lump remains to be excavated in iron-manufacturing sites and refinement blacksmith sites came from the charcoal which used in production and it was able to confirm legitimacy and the effectiveness of those 14 C age measurement.However, the dispersion that exceeded measurement error in the age value in several samples was watched when I did the 14 C age measurement about the inside same iron product. As for dispersion of these samples, we thought that we were caused by a sampling method and a sampling position and possibility of carbon pollution by rust of a sample.In order to solve a problem of dispersion of this age value, inspection about a sampling method or influence of carbon pollution by rust in a sample was left as a future problem. In addition, in order to inspect the thing, development of method the efficiency extracts carbon in product occurring every an ancient manufacturing process and carbon in a byproduct by high purity well more, and to refine is indispensable.