PEAK SHAPE-ANALYSIS OF ISOLATED PEAK-5 IN LIF-MG,TI FOLLOWING 165-DEGREES-C POSTIRRADIATION ANNEALING

The kinetic parameters of peak 5 in the glow curve of LiF:Mg,Ti were s tudied as a function of the duration of post irradiation annealing at 165 degrees C. All three kinetic parameters, E, s and b show important changes as the duration of the anneal increases. Computerised glow pe ak shape analysis shows that b increases from 1.2 +/- 0.05 (1 SD) foll owing 5 min annealing to 1.72 +/- 0.07 (1 SD) following 30 min anneali ng. 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 pos ition of isolated peak 5 (T-max) does not vary with dose illustrating the weakness of this criterion for establishing first order kinetics.