Calibration of AMS C-14 ages prior to 20,000 years B.P. or more, using Fission Track ages of burnt obsidians

本研究的目的是通过两种测年技术（AMS C-14， FT）对同时衍生的样品（分别为木炭和烧黑曜石）的测量年龄进行不一致的程度和趋势的检验。然而，主要是因为FT测年的困难，我们无法得到充分的结果。长野系列黑曜石具有玻璃般透明的品质，其FT年代的计数误差为5%。然而，木炭与烧黑曜石的关联地位取决于第三层依赖（地层）。为了克服这些困难，添加了北海道系列黑曜石。他们的协会地位是二级（考古）。然而，由于晶体性质产生的类似裂变轨迹的蚀刻坑，以及样品的小尺寸，很难获得可靠和可重复的FT年龄。因此，我们无法计算AMS C-14与FT年龄的转换因子。特别是在北海道系列中，信噪比极低，超出了人类视觉的极限。因此，作为第一步，这样的研究应该面向迫切需要的自动和仪器FT测量。我们发表了论文和报告，包括一个相关领域的口头报告，所有这些都被整理在小册子报告中。

The purpose of this research is to examine the degree and tendencies of the discordance of measured ages by two dating techniques (AMS C-14, FT) of the sample (charcoal and burnt obsidian, respectively) of simultaneous derivation. However, mostly because of the difficulties in FT dating, we couldn't obtain sufficient results.The Nagano series obsidians were glass-clear quality, and gave FT ages with 5% counting errors. However, the association status of charcoal and burnt obsidian depends on the third level of reliance (stratigraphic).To overcome these difficulties, the Hokkaido series obsidians were added. Their association status was second level (archaeological). However, due to fission-track-like etch pits derived from crystalline properties, and the small size of the specimens, it was difficult to obtain reliable and reproducible FT ages.As a result, we couldn't calculate conversion factors for AMS C-14 versus FT ages.Especially in the case of Hokkaido series, S/N (signal/noise) ratios were extremely low - beyond the limits of human vision?Therefore, research like this should be oriented for, as a first step, automatic and instrumental FT measurement that is urgently required.We have published papers and reports, including an oral presentation in a related field, all of which have been collated in the booklet report.