“…Variation in single-grain D e values can be caused by a number of factors (Duller, 2008), including partial bleaching, bioturbation (Rink et al, 2013), dosimetric heterogeneity (Thomsen et al, 2003(Thomsen et al, , 2005, instrument reproducibility (3.3%, Thomsen et al, 2005), and (in the case of feldspars) differential fading (Auclair et al, 2003) and/or internal dose-rates (Huntley and Baril, 1997).…”