[Legacy Report] “Dosimetric Characterization of materials with application on archaeometry and retrospective dosimetry”.

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The purpose of this work is to investigate the influence of thermal quenching in quartz luminescence for the application of quartz in dating of archaeological and geological samples. Additionally, it supports to bring precise results when quartz is used for accidental and retrospective dosimetric applications. The information delivered in the present work corresponds to the theoretical study of thermal quenching as well as experimental study on the natural and artificial quartz samples via heating rates within the range 0.25 to 20K/s. The experimental is concentrated on determination of prevalent pair of thermal quenching parameters. It was followed to by the attempt of reconstruction of thermally quenched glow curve.
The theoretical work is based on numerical simulation of influence of thermal quenching in various TL parameters which can be evaluated from experimental glow curve of quartz; peak height, peak integral and methods of evaluation of TL trapping parameters. It also provides valuable information for a) evaluation of thermally quenching parameters (W, C) b) shift of peak maximum temperature (due to thermal quenching), c) the influence on the symmetry factor d) the kinetics order of the glow-peak and e) influence of thermal quenching on the activation energy via different methods of evaluating trapping parameters.
The investigation of thermal quenching parameters, C and W, of quartz and their single pair of prevalence values of W and C were determined; Searching of prevalent values of the thermal quenching parameters i.e. the activation energy W and the dimensionless parameter C from the quartz samples of various origins. The observations of influence of thermal quenching parameters were analyzed from quartz samples annealed at different temperature. One new set of thermal quenching parameters were observed which we named as intermediate group of thermal quenching parameters. However, the prevalence pair of thermal quenching parameters of quartz was observed within the narrow range of values of W and C but it was not able to depict particular prevalent pair of thermal quenching parameters for the peaks of high temperature region. Finally the prevalent pair of thermal quenching parameters were selected which satisfy the entire glow peaks of glow curves. These details will be the crucial in the applied fields of TL and OSL such as dating, authenticity testing, archaeological and geological study.
The reconstruction attempt of thermoluminescence glow curve of quartz samples was performed. The consistency of the reconstructed thermoluminescence glow peaks was observed by retransforming to quenched glow peaks. It was followed by separate analysis to observe consistency in their shape of glow peaks (in peak height, glow peak area and symmetry factor of glow peak) and trapping parameters with that of experimental quenched glow peaks. This study exhibit the reconstruction attempt was successful to provide alternative way to evaluate trapping parameters of thermoluminescence glow curve.

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