Data underlying the publication: A novel method to assess crosstalk in single-grain luminescence detection

All measurements were made on a Risø TL/ OSL DA-20 reader with an automated detection and stimulation head (DASH) and an EMCCD camera (Kook et al., 2015). The system is fitted with a calibrated 90Sr/90Y beta source which delivers a dose rate of approximately 0.0954 Gy/s to grains on a single-grain disc. The sample was stimulated with IR LEDs at 850 nm and a blue package filter (BG-3 (3.0 mm) + BG-39 (4.0 mm)) was used to target the 410 nm K-feldspar emission peak. We adopted a multi-elevated-temperature (MET) pIRIR measurement protocol with IRSL read-outs at 50, 110, 170, and 230 ◦C (Table 1) (Li & Li, 2011). We measured three single-grain discs per sample, which makes a total of 45 discs. We chose to only study crosstalk effects on the IRSL-50 signal for the net natural test dose (8.1 Gy) response (Table 1, step 12 manuscript), which carries information about the luminescence sensitivity of the grains. The net natural test dose response (Net_TnTx ± Net_TnTx.Error) was alculated by subtracting the background test dose response (TnTx.BG) integrated over channel 210 up to 260 (20 s) from the initial test dose response (TnTx) integrated over channel 11 up to 31 (8 s) to create a single-grain brightness distribution (Wallinga, 2002). The measured data were analyzed with Risø Viewer+ software and extracted for nine different ROI sizes: 300, 450, 600, 750, 900, 1050, 1200, 1350 and 1500 μm, i.e. ranging from the hole dimension (300 μm) up to overlapping with the adjacent grain hole (1500 μm). The spacing between grain positions on the single-grain disc is 600 μm. We assume that grains of varying sensitivity are randomly distributed over the single-grain disc grid. Subsequent analyses were performed within the R environment for statistical computing.