The high-temperature (e.g., >200 °C) post-infrared infrared (pIRIR) stimulated luminescence of feldspar has been widely used for dating, because it usually suffers negligibly from anomalous fading. However, compared to the quartz optically stimulated luminescence (OSL) or low-temperature (e.g., 50 °C) IR stimulated luminescence (IRSL) from feldspars, the high-temperature pIRIR signals have been shown to bleach more slowly and usually have high residual does of a few Gys or more, which limits its application to date relatively young samples and may cause problems for correcting residual dose/signal. In this study, we investigated the bleachability of K-feldspar pIRIR signals for individual grains. A significant variation in the bleachability of the pIRIR signal was observed among different K-feldspar grains from the same sample. Experiments show that such a variability may result in different residual doses for different grains and, consequently, additional scatter in D_e values. We present a method for quickly testing the bleachability of individual grains. Our result suggests that selecting the easy-to-bleach grains for D_e determination provides an efficient way to date young samples using high-temperature pIRIR signals, which avoids the compromise of using low-temperature pIRIR signals that may suffer from anomalous fading.

长石的高温（例如，>200 °C）后红外红外 (pIRIR) 受激发光已被广泛用于测年，因为它通常不会受到异常褪色的影响。然而，与长石的石英光激发发光 (OSL) 或低温（例如 50 °C）红外激发发光 (IRSL) 相比，高温 pIRIR 信号的漂白速度较慢且通常具有较高的残留几 Gys 或更多，这限制了它对日期相对较新的样本的应用，并可能导致校正残余剂量/信号的问题。在这项研究中，我们研究了钾长石 pIRIR 信号对单个颗粒的漂白性。在来自同一样品的不同钾长石颗粒中观察到 pIRIR 信号的可漂白性存在显着差异。_e值。我们提出了一种快速测试单个谷物漂白性的方法。我们的结果表明，选择易于漂白的颗粒进行 D _e测定提供了一种使用高温 pIRIR 信号对年轻样品进行年代测定的有效方法，从而避免了使用可能遭受异常衰落的低温 pIRIR 信号的妥协。