High-precision dating of significant geologic phenomena in Post-Glacial age

高精度和高可靠性的放射性碳年代学对于提高环境变化、地壳运动和人类演化的分辨率是必要的。这份放射性碳年表将呈现冰川后时期的清晰和精确的时空图像。为了实现这一年代学，并将其结果应用于更广泛的不同地质背景下的地区，我们引入了结合年代学的高精度放射性碳测年。在广岛大学的苯合成真空线上安装了超低本底液体闪烁β射线计数器。通过仔细检查苯的合成过程、同位素分馏和标准样品的质量，新的放射性碳测年系统已经开始测定冰后期的重要样品的年代。在野外，系统地进行了样品采集、检验和样品-事件关系的测定方法，研究了热液、古地震和海平面波动。

High-precision and high-reliability radiocarbon chronology is necessary to improve the resolution of environmental change, crustal movement, and human evolution. This radiocarbon chronology will present clear and precise space-time images of the Post Glacial period. In order to realize this chronology and to apply the result to more extensive area in different geological context, we introduced high-precision radio carbon dating associated with tephrochronology. An super-low-background liquid scintillation beta-ray counter was installed together with benzene synthesis vacuum line in Hiroshima University. Through careful examination of the procedure of benzene synthesis, of isotopic fractionation, and of the quality of standard samples, the new radiocarbon dating system has begun to date important samples of Post Glacial period. In the field, systematic method for dating sample collection and through examination and sample-event relationship were carried out for tephras, paleoearthquakes, and sea-level fluctuation.