The thermoluminescence mechanism in LiF (TLD-100): Extension of the Mayhugh-Christy model

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Abstract
Thermoluminescence (TL) and emission spectra from LiF (TLD‐100) have been studied over the temperature range from 90 to 500 K. It is shown that over a small temperature interval (130–160 K), shallow trapped electrons may recombine directly with Vk centers and produce emission in the uv (∼270 nm). At approximately this same temperature, the Vk centers may be thermally annealed and produce emission near 400 nm by direct recombination at an activator–F‐center complex. It is also shown that it is possible to produce both uv and visible emission over this limited temperature range solely by the release of electrons. Mayhugh and Christy have previously suggested a model for the TL mechanism in LiF (TLD‐100) which explains the production of TL from 25 to 200 °C. Low‐temperature TL measurements of Podgorsak, Moran, and Cameron indicated that the model was incorrect or that it must be modified to explain the uv emission observed at low temperatures. Our results suggest that the existing model is correct; moreover, when the model is extended to low temperatures, it adequately explains the resultant emission obtained in the present work and also reconciles the data of Podgorsak, Moran, and Cameron with the Mayhugh‐Christy model.

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