Characterization of TL-glow curves resulting from sensitized TLD-100

Abstract

The thermally stimulated glow curves of LiF:Mg,Ti TLD-100 were measured following the absorption of high -irradiation doses from a source. The thermoluminescence (TL) response as a function of dose (up to 100 Gy) was investigated at a constant heating rate of . The data indicate the presence of a linear region (up to 10 Gy) followed by a supralinear one. Similar spectra in both sensitized and unsensitized material for the main overlapping dosimetric peaks ( to ) were observed. The sensitized material, however, indicates the presence of additional deeper trapping peaks beyond , with varying intensities and features depending on the imparted dose. Kinetic analyses based on several methods were adopted concentrating on due to its role in personal dosimetry measurements. The trapping parameters (activation energy, E, frequency factor, s, and kinetic order, b) before and after sensitization were determined. The activation energy values are generally observed to be constant and independent of the sensitization process. Comparison between the values determined and other work, when available, indicates excellent agreement to within 3%. The glow peaks exhibit first order kinetics with sensitization. In particular, the kinetic order of was observed to decrease by about 23% upon sensitization. The results are discussed based on the model of radiative and non-radiative recombinations of non-separately charge traps and luminescent sites by excited and non-excited complexes formed during sensitization.