Abstract
The response of thermoluminescent (TL) materials to infrared laser stimulation has been observed but cannot be fully characterized experimentally due to the inability of modern measuring techniques to accurately record the rapidly changing temperatures. A two-dimensional, unsteady-state model has been derived to determine radial and axial temperature profiles in a TL layer when a 4 W CO2 Gaussian laser beam is used to heat a single or multiple spots. The numerical model is solved using the alternating direction implicit scheme on a Convex XP2 mini-supercomputer. The results for LiF plates (0.5–0.1 mm thick) demonstrate that detailed temperature profiles and heating rates may be determined for any number of thermally stimulated regions. As a result, the feasibility of a scanning laser heated TL radiographic imaging system may be evaluated and spatial resolution of such a system may be predicted.
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