High ambient temperature effects in LiF TLD-100

Experimental results for the evolution of the TLD-100 glow peaks IV and V during storage at 70 degrees C are presented. These results confirm a previous conclusion on the null incidence of spontaneous release of radiation-induced trapped charges on this evolution. The results at 70 degrees C allow one to extend this conclusion to the whole range of ambient temperatures. Only thermally activated trap modification processes are responsible for the TL yield variations during long duration ambient exposures. The identification of the nature of these variations suggests a rather simple dosimetric procedure requiring only the determination of the dosimeter sensitivity at the end of the exposure interval. Results are given illustrating the effectiveness of this procedure for the accurate measurement of ambient doses up to 70 degrees C.