Laser stimulated thermoluminescence

Abstract

Experimental and computational methods are presented for the complete characterization of the thermoluminescence response obtained from thermoluminescent phosphors upon exposure to localized Gaussian laser heating beams. A number of different phosphor configurations are described as examples. These include LiF:Mg,Ti (TLD-100, Harshaw Chemical Corporation) in form of chips, which are widely used in the dosimetry of ionizing radiation, and thin-layer dosimeters prepared either as self-supporting films or powder in a polyimide matrix, or on substrates of LiF single crystals or borosilicate glass. It is demonstrated that all relevant optical and thermal properties of the dosimeters can be determined by these methods and that, based on this knowledge, the expected thermoluminescence response of a given configuration can be simulated as a function of a number of experimental parameters.

Transient solution of the diffusion equation for a composite system heated with a laser beam

“…Accepted literature values were used for the material parameters except for a parameter combination B (defined herein), which was obtained by an independent measurement. 4 In fitting theory and experiment, B, the only adjustable parameter, agreed with its measured value to within the experimental error. However, in prior work, the TL response was monitored only during the pulse duration t p ' when the source term is "on" in the diffusion equati.on.…”

Laser-fiberoptic non-contact controlled heating of samples for thermoluminescence measurements

“…In recent years laser heating techniques have been developed, which offer high heating rates and reproducibility [4]. These methods, however, have some of the disadvantages mentioned above, since they do not enable precisely to determine the temperature of the sample during the heating process.…”