Thermoluminescence studies of LiF (TLD-100) in the temperature interval 10-300 K


LiF (TLD-100) has been investigated by thermoluminescence (TL) techniques in the temperature interval 10-300 K. Emission spectra data, in conjunction with thermal annealing, photobleaching, and optical repopulation studies, support the model previously proposed by Cooke to explain the TL mechanism in TLD-100 over the temperature range of 90-500 K. By extending the studies to 10 K, six new glow peaks have been observed; maxima occur at 20, 44, 60, 66, 84, and 124 K. The latter peak represents a shoulder on the intense glow peak occurring near 138 K (previously reported) and is attributed to the thermal release of trapped electrons. The remaining peaks are associated with the thermal detrapping of shallow trapped holes which produce 400-nm band emission. By incorporating the existence of shallow trapped holes into the existing model we present a band-gap model which depicts the TL mechanism in TLD-100 valid in the temperature interval 10-500 K.

Publication Title

Journal of Applied Physics