Age underestimates and wide equivalent paleodose distributions are commonly observed in IRSL dating of feldspar minerals using both multiple and single aliquot methods. For well-bleached sediments, this is thought to be caused primarily by anomalous fading. This article explains how to assess a fading rate (g value), which can be used to correct the measured optical ages. It also shows how different fading rates are obtained on single-aliquots using different protocols. It is found that the g value deduced from delayed Li/Ti measurements is strongly dependent on the timing of the preheat treatment. For the single-aliquot regenerative-dose protocol (SAR), best results are obtained using delayed Li/Ti ratios if the samples are preheated before storage.
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