Peak shape analysis of isolated peak 5 in LiF:Mg,Ti following 165°C post-irradiation annealing

The kinetic parameters of peak 5 in the glow curve of LiF:Mg,Ti were studied as a function of the duration of postirradiation annealing at 165°C. All three kinetic parameters, E, s and b show important changes as the duration of the anneal increases. Computerised glow peak shape analysis shows that b increases from 1.2 ± 0.05 (1 SD) following 5 min annealing to 1.72 ± 0.07 (1 SD) following 30 min annealing. Extrapolation to zero annealing time, however, results in a value of b consistent with unity. The activation energy, E, increases from 1.75 eV at 5 min annealing to a value of 2.0 eV after 15 min annealing and then remains constant for longer annealing times. However, the position of isolated peak 5 (T(max)) does not vary with dose illustrating the weakness of this criterion for establishing first order kinetics.