Observations on some thermoluminescence emission centres in geological quartz

Scholefield, R.B.; Prescott, J.R.; Franklin, A.D.; Fox, Phillip J.

doi:10.1016/1350-4487(94)90072-8

Cited by 32 publications

(6 citation statements)

References 15 publications

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“…The TL emission spectrum of quartz usually comprises three main bands centred on ~380 nm (3.3 eV), ~470 nm (2.6 eV) and ~620 nm (2.0 eV), while for quartz types of distinct formation conditions additional emissions have been reported, e.g. a band at 420-435 nm in igneous quartz or one at 560-580 nm in hydrothermal vein quartz (Rink et al 1993;Scholefield et al 1994;Itoh et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Quartz thermoluminescence spectra in the high-dose range

Schmidt

Woda

2019

Phys Chem Minerals

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The red thermoluminescence (RTL) emission of quartz is associated with advantageous features such as high saturation dose and good reproducibility. Previous studies, however, noted inexplicable RTL glow curve shapes with new peaks at large doses (kGy range). Here we present TL spectra of two granitic quartz samples over the additive γ-dose range 0.1-47.9 kGy. While for doses between 0.4 and 1 kGy the TL spectra are dominated by the red emission at 1.95 eV (630 nm), a blue emission at 2.67 eV (465 nm) becomes prominent for higher doses. For one sample, this blue component completely dominates the spectrum for doses >12.2 kGy with intensity maxima around 200 °C and >350 °C (heating rate 2 K s-1). The other sample still contains well resolvable red and blue emissions at the largest dose with similar TL peak positions. Signal saturation for the blue emission in the glow curve range 260-300 °C is not yet reached following an additive γ-dose of 47.9 kGy, whereas the red emission generally shows a more subdued signal response for doses >5-12 kGy. These findings agree qualitatively with additional monochromatic blue and red TL measurements on the same samples. The evolution of supplementary radiofluorescence spectra over the entire γ-dose range is more complex, but suggests that the sensitisation of the blue wavelength region occurs during heating and not during irradiation and through creation of electron traps rather than recombination centres (most likely [AlO4] 0 sites). The sharp sensitivity increase at 1 kGy might likewise be related to alkali ion redistribution and/or the removal of non-radiative competitive recombination pathways. While the blue emission still requires thorough investigation, care should be taken when recording RTL using optical filters since significant portions of the registered TL could originate from the blue component entering the RTL transmission window. In practical terms, the dose-dependent change in relative intensities of blue and red TL emissions might help in detecting exposure to high doses.

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Section: Introductionmentioning

confidence: 99%

Quartz thermoluminescence spectra in the high-dose range

Schmidt

Woda

2019

Phys Chem Minerals

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“…The 325 °C TL peak bleaches more rapidly than that at 375 °C [36] and its emission peaks at about 380 nm [37]. Hence, by using appropriate filters, the emission can be separated from that of the 375 °C peak.…”

Section: Quartz Tl Propertiesmentioning

confidence: 99%

Luminescence Chronology

Munyikwa¹

2014

Geochronology - Methods and Case Studies

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“…This method has been used different applications, such as radiation dosimetry retrospective dosimetry, including personal monitoring, environmental monitoring [1][2][3]. Quartz is one of the natural minerals used in radiation studies frequently [4][5][6][7]. The luminescence emitted from quartz is complex and shows a variety of different components with diverse physical properties [8,9].…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence Properties of Quartzite Rock after β-irradiation

Doǧan

2018

Cumhuriyet Science Journal

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In the present study, the thermoluminescence characteristics of natural quartzite collected from Karaisalı (Adana) in Turkey were investigated after β irradiation at room temperature with the purpose to use as radiation dosimetry. The glow curve of quartzite mineral shows two peaks at 110 o C and 250 o C and a shoulder at 375 o C, explicitly. The resulting peaks, which were examined using the computer glow curve deconvulation (CGCD) method, were deconvuluted and kinetic parameters (activation energy Ea, frequency factor (s) and kinetic degree (b)) were determined. After CGCD methods, it was seen that the glow curve suporposed at least eight peaks. Additionally, kinetic parameters were determined using by Arrhenius plot obtained from initial rise (IR) method. In this study, it is shown that there is a correspondence between kinetic parameters calculated by IR method and peaks deconvoluated by CGCD technique in low temperature region (P1-P3). Additionally, reusability test was conducted to investigate its usability as a dosimetric material, and a change of 2% was observed in the results of 10 repeated times. Besides to the characterization of this sample X-ray diffraction (XRD) and scanning electron microscopy (SEM)-energy dispersive X-ray (EDX) results were investigated.

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Observations on some thermoluminescence emission centres in geological quartz

Cited by 32 publications

References 15 publications

Quartz thermoluminescence spectra in the high-dose range

Quartz thermoluminescence spectra in the high-dose range

Luminescence Chronology

Thermoluminescence Properties of Quartzite Rock after β-irradiation

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