SAR protocols used in this study to obtain ages from quartz (protocol A) and K-feldspars (protocol B).

Ln and Lx refer to the natural and regenerative-dose signal measurements, respectively. Tn and Tx refer to the test dose signals measured after the Ln and Lx signals, respectively. Each SAR measurement cycle was repeated for the natural-dose, three to four different sized regenerative doses, a 0 Gy regenerative-dose (to measure OSL signal recuperation) and a replicate of the first regenerative-dose cycle (to assess the suitability of the test-dose sensitivity correction). In the case of the single-grain TT-OSL SAR procedure, the OSL IR depletion ratio [124] was measured separately and used to check for the presence of feldspar contaminants.a Step omitted when measuring the natural signal (Ln).b Aliquots were held at pIR-IR stimulation temperatures for 10 s prior to switching on the IR diodes to avoid any potential isothermal TL contamination of the pIR-IR signal.c A high temperature IRSL stimulation was not included at the end of each pIR-IR SAR measurement cycle because these samples did not display significant signal recuperation (the 0 Gy regenerative dose pIR-IR signal was consistently SAR protocols used in this study to obtain ages from quartz (protocol A) and K-feldspars (protocol B).