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LM-OSL signals from some insulators: An analysis of the dependency of the detrapping probability on stimulation light intensity
Date
2001-01-01
Author
Bulur, Enver
Murray, A.S.
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Optically stimulated luminescence (OSL) signals from various insulators including quartz, Al2O3 : C, BeO and NaCl have been studied using the linear modulation OSL (LM-OSL) technique. LM-OSL is based on the linear increase of the stimulation light power from zero to a maximum during the measurement. The resultant OSL curve initially increases and then decays after reaching a maximum, The analysis of LM-OSL data usually assumes a linear relationship between the detrapping rate and the stimulation light intensity. However, experiments carried out using various insulators have shown that this assumption is not always correct. The initial decay rates of the blue (similar to 470 nm) light stimulated constant power OSL decay curves were examined to test the relation between the detrapping rates and the stimulation light intensity. In SiO2, Al2O3 : C and BeO a linear relation between the detrapping rates and the stimulation light intensity was observed. However the detrapping rate of the OSL signal from NaCl was non-linear. Assuming that this non-linearity can be described using a saturating exponential function, a new more general expression for the LM-OSL signal has been derived. The validity of this expression was checked using curve fitting and it was found that the new expression could describe the LM-OSL curves successfully.
Subject Keywords
Linear modulation technique
,
Luminescence
,
Quartz
URI
https://hdl.handle.net/11511/46175
Journal
Radiation Measurements
DOI
https://doi.org/10.1016/s1350-4487(01)00089-0
Collections
Department of Physics, Article
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The optically stimulated luminescence (OSL) from heated natural quartz has been investigated using the linear modulation technique (LMT), in which the excitation light intensity is increased linearly during stimulation. In contrast to conventional stimulation, which usually produces a monotonically decreasing signal, linearly increasing the stimulation power gives peaks in the signal as a function of time. In cases where the OSL signal contains more than one component, the linear increase in power of the st...
LM-OSL from single grains of quartz: A preliminary study
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The recently developed single grain attachment for the Riso TL-OSL reader has been modified to achieve linearly modulated optically stimulated luminescence (LM-OSL). Three different types of luminescence behaviour were observed in 81 quartz grains measured. These types are those showing only the easy-to-bleach component, those with only the hard-to-bleach component, and those exhibiting all components. The results of this preliminary study show that LM-OSL experiments carried out at the single grain level m...
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Bulur, Enver (1997-01-01)
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Simple transformation for converting CW-OSL curves to LM-OSL curves
Bulur, Enver (2000-01-01)
A simple mathematical transformation is introduced to convert from OSL decay curves obtained in the conventional way to those obtained using a linear modulation technique based on a linear increase of the stimulation light intensity during OSL measurement. The validity of the transformation was tested by the IR-stimulated luminescence curves from feldspars, recorded using both the conventional and the linear modulation techniques. The transformation was further applied to green-light-stimulated OSL from K a...
Infrared (IR) stimulated luminescence from feldspars with linearly increasing excitation light intensity
Bulur, Enver (1999-01-01)
IR stimulated luminescence signal from potassium and sodium feldspars were studied by linearly increasing the excitation power from zero to a maximum value during the readout. The peak shaped signals observed in both feldspars could be approximated using a linear combination of three first-order components as deduced by curve fitting. The thermal and radiation dose dependent behavior of the IR-stimulated OSL curves were also studied. (C) 1999 Elsevier Science Ltd. All rights reserved.
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E. Bulur and A. S. Murray, “LM-OSL signals from some insulators: An analysis of the dependency of the detrapping probability on stimulation light intensity,”
Radiation Measurements
, pp. 715–719, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46175.