Revisiting natural and laboratory electron spin resonance (ESR) dose response curves of quartz from Chinese loess

Natural and laboratory ESR dose response curves (DRCs) of [AlO4/h]0 [TiO4/M+]0 were investigated for samples quartz from the Luochuan loess-palaeosol master section, Chinese Loess Plateau. The natural DRCs show a clear divergence above ∼1000 Gy, with much lower D0 values saturation levels observed DRCs, which is in agreement previous study by Tsukamoto et al. (2018). Young (<15 ka) Jingbian – another site Plateau, together two modern loess, used to investigate residual signals centres. Our results are line published studies that significant corresponding several tens hundreds Gy present both Al Ti These need be taken into account before DRC construction. pulse annealing experiments performed on irradiated different doses an apparent dose-dependent thermal instability [TiO4/M+]0, higher decaying faster increasing temperature. We attribute change preheat reported al.2018, as well difference between this signals. level DRC, being result reaching equilibrium filling traps emptying them due decay, therefore additionally affected at doses, increased instability. inability recreate same irradiation one nature questions accuracy dating beyond Gy.