Simulation of an anomalous behavior of thermoluminescence glow peak of quartz from Nigeria
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Date
2017
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Ankara : Ankara Üniversitesi
Abstract
Mechanism of the experimentally observed anomalous shift of a thermoluminescence (TL) glow peak that varied with
irradiation dose is yet to be fully established. A theory that the anomalous peak must have contained more than one first
order composite peaks each with different TL dose characteristics has been one major explanation proposed to explain this
observation. This work was undertaken to simulate the anomalous glow peak by using a modified version of a previously
proposed model and numerically solving sets of simultaneous differential equations governing the stages of TL phenomena
(excitation, relaxation and heating). In the modified model, two additional electron trapping centers were incorporated in
order to simulate accurately this glow curve. Computerized glow curve deconvolution (CGCD) analyses was carried out
on the simulated glow peak in attempt to retrieve back the electron trapping center energies and to identify their respective
peak positions. The outcome of this confirmed the peak to be possibly composite in nature comprising of three overlapping
glow peaks at 288, 300 and 317oC with respective energy gaps of 1.70, 1.73 and 1.75eV. It is therefore further substantiated
that this kind of temperature shift of peak with dose resulting from composite glow peaks is possible.
Description
Keywords
Thermoluminescence, Simulation, Quartz