Kinetic analysis of the 300 °C TL peak in Solonópole natural quartz sensitized by heat and gamma radiation

Guzzo, Pedro L.; Souza, Leonardo B. Ferreira de; Khoury, Helen J.

doi:10.1016/j.radmeas.2011.02.024

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…The sensitized peak in quartz-pellets occurs in a higher temperature than that observed in free quartz grains and single-crystal discs where the peak maximum temperature is near 280 °C 15,19 . A kinetic analysis of this peak showed that the activation energy and its shape remain unchanged even after 190 hours of annealing (accumulated) carried out at 400 °C [27] . These results show that quartz-pellets has the preliminary characteristics suitable to a TLD material, i.e., the dosimetric peak is simple in shape; it occurs separately between 200 and 400 °C and it has the thermal stability required for reusability.…”

Section: Glow Curve Characteristicsmentioning

confidence: 99%

Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry

et al. 2012

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This paper describes the manufacturing process of quartz-pellets and shows their potential use as thermoluminescence dosimeters (TLD) for those applications where low-levels of ionising radiation are present. Two batches of cold-pressed pellets were produced and their resistance were evaluated by vibration tests and weight-loss measurements. The batch manufactured with 75 × 150 µm particles showed enough resistance to be employed as TLD. The dosimetric properties of the 310 °C peak appearing in the glow curves of these pellets were characterized together with commercial TLD-100 units using γ-and X-ray beams with different energies. The uncertainties related to reproducibility and stability of the TL signal were better than 10%. The sensitivity and the linearity of the TL response of quartz-pellets were better than that measured for TLD-100 for doses ranging from 0.5 to 200 mGy. The energy dependence of the quartz-pellets was higher than that of TLD-100 but it cannot be considered a restriction to their use in clinical procedures and industrial applications.

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Section: Glow Curve Characteristicsmentioning

confidence: 99%

Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry

et al. 2012

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“…The natural quartz used in the present study corresponds to a single crystal extracted from one deposit located in the district of Solonópole (Ceará State, Brazil), which was used in previous studies [11][12][13]. It was a semi-euhedral and lightly smoky specimen with two defined prismatic (m-) faces.…”

Section: Samples and Sensitizationmentioning

confidence: 99%

“…Previously, optically stimulated luminescence (OSL) measurements with stimulation of blue LEDs produced partial desensitization in the samples [11] and the batch of samples were submitted to several test-dose irradiation and heating cycles [12,13]. Therefore, to reuse the samples in the TL measurements, it was necessary to define a new starting point by submitting all samples to a prolonged heat treatment.…”

Section: Samples and Sensitizationmentioning

confidence: 99%

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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Differentiation Between Natural Quartz-Based on Thermoluminescence Properties

Farouk,

Gad,

El-Faramawy

2024

Advances in Material Research and Technology

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Kinetic analysis of the 300 °C TL peak in Solonópole natural quartz sensitized by heat and gamma radiation

Cited by 6 publications

References 10 publications

Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry

Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry

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

Differentiation Between Natural Quartz-Based on Thermoluminescence Properties

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