Determination of kinetics parameters of the main glow peaks for KMgF3:Lu and LiF:Mg phosphors after long-term high temperature storage

•Validation of modified isothermal decay expression is given.•The maximum TL intensity, IM, decreases with post-irradiation thermal treatment.•Because of overlapped glow peaks a variation on the E values as the doses was obtained.•The activation energy of TL glow peaks, KMgF3:Lu and LiF:Mg, was calculated.•The kinetics parameters obtained are in agreement by GOK and SQPGCD deconvolution.

The isothermal decay method is useful for determining the trap activation energy in thermoluminescent material for dosimetry purposes. Recently we proposed new modified expressions for isothermal decay method. As validation of the modified expressions, after long-term (4 h) high temperature storage, the activation energy of experimental TL glow peaks, KMgF3:Lu (0.17 and 0.34 mol%) and LiF:Mg (0.04 mol%), in the framework of the general-order kinetic was calculated. The results of the kinetics parameters were compared with those obtained by the other methods like Initial Rise (IR), Sequential Quadratic Programming Glow Curve Deconvolution (SQPGCD), deconvolution of the TL glow curves by assuming the General Order Kinetic (GOK), and Chen General-Order Kinetics method. It seems that both SQPGCD and GOK deconvolution methods give more accurate kinetics parameters values for the experimental glow curves.