“…A sum of two exponential saturation function was found to be the best approximation to fit the growth curve of the combinded g ¼2.0015 signal. The sum of two exponential saturation function corresponds to two components of the ESR signal with different irradiation sensitivities (Çetin et al, 1993(Çetin et al, : Hoffmann et al, 2001(Çetin et al, , , 2003Engin et al, 2010). This fitting function is given by:…”