Red thermal luminescence dating of terrace deposits using a single quartz grain

对日本北部阶地矿床的红色热释光(RTL)测年从单个石英颗粒进行了评估。由于石英对日光漂白具有很强的RTL抗性，以前的方法是用两个多颗粒等分独立地确定表观当量剂量(AP-De)和残留水平(RL)。我们设计了一种新的方法，即单增益分割法，从用锤子和钉子形成的单个颗粒的碎片中获得AP-De和RI。新开发的RTL设备使我们能够成功地从400μm大小的单石英颗粒中探测到最小的RTL信号(约20GY)。用两个阶地沉积物样本对新方法的实用性进行了评价。由单次等分再生剂量(SAR)Ap-De和SAR Ri-De推算的最小当量剂量(De)得到的RTL年龄分别为241±20ka和113ka±17ka，分别与地质证据估算的OIS7和OIS5e的年龄相吻合。

Red thermoluminescence (RTL) dating of terrace deposits in northern Japan was evaluated from a single quartz grain. Because of the strong RTL resistance property of quartzes to daylight bleaching, previous methods determined the apparent equivalent dose (Ap-De) and the residual level (Rl) independently using two multigrain aliquots. We devised a new method, a single gain division method, to obtain the Ap-De and RI from divided fragments of a single grain, which were formed by using a hammer and nail. The newly developed RTL equipment enabled us successfully to detect minimum RTL signals (about 20Gy) from a 400μm size single quartz grain. Two samples of terrace deposits were used to evaluate the practicability of the new method. The RTL ages of 241±20ka and 113ka±17ka, which were determined by minimum equivalent doses (De) deduced from the single aliquot regenerative doses (SAR) Ap-De and SAR RI-De agreed well with the eras of OIS7 and OIS5e, respectively, estimated by geological evidence.