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Thermoluminescence glow curves of alumina (1) used as electrodes in DBD plasma, (2) after 90 s exposure time to beta radiation, (3) after 10 min exposure to the UV radiation of Hg lamp, and (4) virgin alumina not exposed to any radiation source. The thermoluminescence curve (1) for plasma exposure has been multiplied by a factor of 20 for clarity.
Experimental thermoluminescence glow curve of plasma exposed alumina (curve 1 in Fig. 1) and corresponding fitting by using the GLOW FIT program. Here the glow peaks contributing to the glow curve have been also displayed. It can be observed that the peak intensities follow the first order kinetics (see Refs. 5 and 11). The inset shows the calculated residuals vs temperature; residual values below 10% have been found in the range between 400 and 700 K. Some of the glow peak intensities have been multiplied by a factor of 10 for clarity.
Optically stimulated luminescence (OSL) data and corresponding fitting curve and decay time values of alumina exposed to plasma. The decay curve was fitted to a second order exponential function. In the inset the thermoluminescence glow curves before and after the OSL readout evidence the bleaching effect only on the low temperature peaks, while the peak at remains unaffected.
Thermoluminescence glow peak temperatures and corresponding trap energy levels extracted as fitting parameters by applying the GLOW FIT program to glow curves in Fig. 1. It could be observed that almost the same set of fitting parameters resulted for and plasma irradiated sample, while slightly different values have been observed in mercury lamp irradiated alumina.
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