Development of a New OSL Dating Technique with a Trace of Sample at Low Temperature and Its Applicationto Excavated Materials

本研究项目的目的是改进光释光测年技术，改善光释光信号重现性差、灵敏度变化大等缺陷，并通过将样品置于低温下降低光释光现象过程中的热效应，抑制俘获电子的激活能。低温下石英和长石的光释光测量。2.标准长石样品的彩色图像。3. 20021年出土材料的光释光测年。用细颗粒技术测定出土物的IRSL年代。2.用半细粒（1-50 μm）样品进行IRSL测年试验。3.通过单试样测量的试验，我们成功地得到了一个适合于晶石和细粒样品测量的最佳条件（预热温度160 ℃，测量温度60 ℃）。未观察到异常褪色。结果表明，预热温度和时间分别为120 ℃ 10秒、200 ℃ 10秒和310 ℃ 300秒的石英样品较好。然而，石英样品并没有显示出挖掘材料或地层的合理考古年龄。

The aim of this research project is to refine the OSL dating techniques by improving the defects such as poor reproducibility of OSL signals and the sensitivity change of it. It is also focused on reducing the thermal effects in the process of OSL phenomenon by putting the samples in a low temperature and restrain the activation energy of trapped electrons.In 20011. OSL measurements of quartz and feldspar at low temperature. 2. Color images of standard feldspar samples. 3. OSL dating of excavated materials.In 20021. IRSL dating of excavated material by fine grain techniques. 2. Trial of IRSL dating using semi-fine (1-50 μm) grain samples. 3. Trial of single aliquot measurements.As a result, we succeeded to get an optimal condition for the measurements of feldspars and fine grain samples (pre-heat at 160C, measurements at 60C). Anomalous fading was not observed. We found that the conditions of preheat temperature and time of 120C for 10 sec, 200C far 10 sec or 310C for 300 sec are preferable far quartz samples. Quartz samples, however, do not show the reasonable archaeological ages for the excavated materials or strata.