“…However, additional issues have been raised, such as, first, the domination by medium and/or slow components which are thermally unstable (e.g. Jain et al, 2003), fading in quartz of volcanic origin, or in some loess (Bonde et al, 2001;Tsukamoto et al, 2007;Perić et al, 2021), and, secondly, differences in competition for free charges, which can occur during stimulation and/or dosing and/or heating, between the traps and luminescence centers for natural and artificial dose rates (Bailey et al, 2004a). The consequence of this difference in competition is that the regenerative dose response curve is not equivalent to the natural dose response curve, and/or the natural test dose signal is not a good surrogate for the sensitivity of the natural signal (e.g.…”