Computerised glow curve analysis has been used to examine the dependence of the peak parameters of LiF:Mg,Ti (TLD-100) on the pre-irradiation annealing procedure in the temperature range 353 K to 673 K. The intensities of the main peaks 1, 2, 3, 4 and 5 as well as the activation energies and frequency factors were found to vary strongly with the pre-irradiation low temperature annealing. The trends in the changes of the glow curves with respect to peaks 2 and 5 could be explained by the defect reaction equation MgV r (MgV)2 r (MgV) 3 r precipitates, and an additional assumption that the traps responsible for peak 2 react during read out with MgV and (MgV)2. The 'precipitation' process was found to be frozen in at temperatures lower than 373 K. The influences of variations in the cooling rate in the annealing procedure on the glow curve shape are discussed. It was found that for accurate dosimetry the cooling applied in the annealing procedure is not a very critical factor for high cooling rates (> 1 K.s -1 ) but may be a very critical factor for low cooling rates (<0.08 K.s -1 ).