Thermal stability assessment of OSL signal by measuring the OSL thermal depletion curves

•OSL thermal depletion curve method allows determining thermal stability of OSL signal.•Other traps present besides the tested OSL traps disturb the depletion curves.•Depletion curve deformations lead to false values of the trap parameters and lifetime.•Trap parameters strongly depend on the tempera...

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Bibliographic Details
Published in:	Measurement : journal of the International Measurement Confederation Vol. 199; p. 111505
Main Authors:	Pawlak, Natalia Karolina, Chruścińska, Alicja, Biernacka, Magdalena, Palczewski, Piotr
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-08-2022
Subjects:	Arrhenius plot Isothermal experiments Optically stimulated luminescence Thermal stability Traps Isothermal experiments Optically stimulated luminescence Traps Arrhenius plot Thermal stability
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Summary:	•OSL thermal depletion curve method allows determining thermal stability of OSL signal.•Other traps present besides the tested OSL traps disturb the depletion curves.•Depletion curve deformations lead to false values of the trap parameters and lifetime.•Trap parameters strongly depend on the temperature of preheat and the excitation dose.•The form of depletion curve deformation can inform about the cause of deformation. Metastable states called traps in minerals are responsible for the optically stimulated luminescence (OSL) exploited in dating sediments and thermochronometry. The accuracy of trap parameters that determine the OSL thermal stability is crucial for the quality of results. A method of trap parameter determination used more and more often is the isothermal holding experiment. The problem that makes measurement results hard to interpret is the presence of other traps in the sample apart from the investigated one. Here, simulations of basic processes during isothermal holding experiments are made for a model including three traps. They prove that the irradiation dose and preheat impact the estimated trap parameters. In the presented results of experiments for quartz, which is a much more complex system than the considered model, one can recognize the characteristic effects observed in the simulations. The ways of recognizing the effects responsible for disturbances of results and improving measurements are indicated.
ISSN:	0263-2241 1873-412X
DOI:	10.1016/j.measurement.2022.111505