Time and dose-rate dependence of TL and OSL due to competition between excitation and fading

Chen, R.; Pagonis, Vasilis; Lawless, J.L.

doi:10.1016/j.radmeas.2015.09.006

Cited by 10 publications

(2 citation statements)

References 15 publications

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“…It is also observed that the signal registered with the highest dose-rate (β source) is more dominant for the first peak of Z and ReS samples than for the 330 °C and sensitized peak. The findings of peak intensities at 330 °C and the sensitized peak summarized in Table 2 are in agreement with Valladas and Ferreira [9]. The authors studied rock crystal (hyaline) samples annealed at 600 °C using two radiation sources with dose-rate of 1.33×10 -4 Gy/s ( 137 Cs) and 0.15 Gy/s ( 60 Co).…”

Section: Kinetic Analysissupporting

confidence: 87%

“…The overall analysis of dose-rate effects in some luminescent materials suggested that the TL response as a function of the dose is not completely independent from the dose-rate. In the case of quartz, it was also noticed that the TL emissions related to high temperature glow peaks change differently with the increase of the dose-rate [7,9]. Another study showed that the variation of the dose-rate from 1.4x10 -3 to 3.3 Gy/s caused a decrease in TL signal in a factor of five in powdered samples of Brazilian quartz irradiated with 60 Co γ rays [5].…”

Section: Introductionmentioning

confidence: 99%

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Comparing the monochromatic TL response of a high sensitivity natural quartz irradiated with β and γ rays

Caicedo¹,

Guzzo

Asfora

2022

Braz. J. Rad. Sci.

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This study investigates the effect of the dose-rate in the thermoluminescent glow curves of a single crystal of quartz. The samples were sensitized by the γ radiation combined with the heat-treatments. The glow curves were registered in zeroed (unsensitized) and sensitized conditions using an optical filter centered in violet spectral region. Tens mGy test doses were administered with one β (90Sr/90Y) source and two γ radiation sources (60Co and 137Cs). The TL curves were deconvoluted using a first-order kinetic model. Differences in the glow curves and trapping parameters were observed between zeroed and sensitized samples. Differences were found in the TL curves comparing the three radiation sources. The principal variation is the remarkable increase in the TL signal above 350 °C, which is observed only in sensitized samples with the minor dose-rate source (137Cs). This signal seems to be associated with deep trapping states. The intensities of the components defining the first peak and the high temperature signal show a dependence on the dose-rate. The dose-rate dependence of the first-peak components is explained by the competing effects that may take place during the excitation stage. The components that fitted the sensitized peak (260 oC) do not exhibit a clear dependence on the dose-rate of radiation source.

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Section: Kinetic Analysissupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%