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Rapid readout rate of studies of thermoluminescence in LiF (TLD-100) crystals. III

The heating rate is an important, though often neglected experimental variable in TL measurements. Lithium fluoride (TLD-100) samples have been heated at rates up to 100 degrees C s-1 during TL readout. The change in TL glow peak intensities and (Mg2+-V-) dipole concentration during readout have been investigated for varying heating rates and initial (Mg2+-V-) dipole concentrations. To avoid significant dipole clustering during TL readout, samples must be heated at rates greater than 10 degrees C s-1. However, TL glow peak intensities alter dramatically with increasing heating rates even up to 100 degrees C s-1 where dipole clustering is negligible. It is concluded that because of defect clustering during readout, TL measurements are unlikely to reflect the defect state that existed in the sample just prior to measurement. In particular it is proposed that, for rapidly quenched samples, glow peak 5 would not exist if the sample would be heated sufficiently rapidly.