Abstract
Lithium fluoride fluorescent nuclear track detectors (FNTD) irradiated with alpha-particles were subjected to annealing at temperatures ranging up to 400 °C. It was found that for the annealing temperatures between 200 °C and 300 °C the intensity of fluorescent tracks increases. The maximum enhancement factor of 2.5 is reached for a temperature of 290 °C. For temperatures exceeding 300 °C the intensity decreases and above 340 °C the tracks are not visible. The effect of track enhancement is permanent - no differences were observed for several weeks after the thermal treatment. An interesting phenomenon is the influence of the particle fluence: with increasing fluence the enhancement factor decreases and for the fluence around 2.9*107 cm−2, the intensity of light registered after heat treatment is lower than the initial one. It is still unclear what is the reason behind the observed effect. It however seems probable that the mechanism involves transforming part of F centers into F2 centers. Nevertheless, the effect is promising, as it may lead to signal-to-noise ratio improvement and improved measuring capabilities of LiF FNTDs.
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