论文部分内容阅读
在ESR考古测年中,外部剂量率通常是年代结果的一个主要误差来源,其在历史过程中不断变化,所以很难通过现今的野外测量准确测定。等时线技术可解决化石样品测年中外部剂量率的不确定性问题。本研究尝试将ESR-铀系联合化石分析结合等时线技术应用于重庆龙骨坡遗址CⅢ’6层相邻探方中采集的5颗牙齿。ESR-铀系联合分析显示全部样品均经历了铀的近期吸收过程。平均外部剂量率通过等时线方法分步迭代计算,得到样品等时线年龄为1.77±0.09 Ma。本研究表明,将ESR-铀系联合分析与等时线技术相结合可同时解决牙齿化石样品ESR测年中内部剂量率和外部剂量率的问题。
During the ESR archeology, the external dose rate, which is often a major source of error in the results of the seasons, has evolved over the course of history and is therefore difficult to accurately measure using today’s field measurements. The isochrone technique can solve the uncertainty of the external dose rate in fossil sample dating. In this study, ESR-uranium united fossil analysis combined with isochronal technique was applied to five teeth collected from adjacent exploration site of CⅢ’6 layer in Longgupo Site, Chongqing. The joint ESR-uranium series analysis showed that all the samples were subjected to the recent uranium absorption process. The average external dose rate was calculated iteratively by isochronous method. The isochron age of sample was 1.77 ± 0.09 Ma. This study shows that the combination of ESR-uranium co-analysis with isochrone technique can solve both the internal dose rate and the external dose rate in ESR dating of dental fossil samples.