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The age range of the single-aliquot regenerative-dose (SAR) protocol applied to quartz optically stimulated luminescence (OSL) has become the subject of debate as age underestimations for samples of Eemian age (ca. 125 ka) and older are increasingly reported. In order to investigate the origin of the age underestimation, the behaviour of fine grain quartz samples taken from two sites was compared...
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