LOW-TEMPERATURE (80-240-DEGREES-C) ANNEALING CHARACTERISTICS OF LIF-MG, CU, P

Thermal treatment of LIF:Mg, Cu, P in the range 80-240 degrees C perfo rmed after typical annealing at 240 degrees C for 10 min causes import ant modifications to the glow-curve structure and to the behaviour of the individual glow-peaks. The maximum glow-peak temperatures and the activation energies obtained by a glow-curve de-convolution procedure are varied as a function of pre-irradiation annealing at temperatures below 240 degrees C. Initial rise measurements support the results obt ained by the glow-curve de-convolution concerning the high values of t he activation energy of glow-peak 4, as well as its variation as a fun ction of the pre-irradiation annealing. The 'prompt' isothermal decay of glow-peak 4 at temperatures just below the maximum peak temperature consists of three components instead of one, which would be expected from the kinetic models. The second component corresponds to glow-peak 4 and also presents very high E and s values. The third one correspon ds to a glow-peak at the high-temperature tail of peak 4. The first co mponent was attributed to a mechanism competitive to the mechanism res ponsible for the main peak 4.