Point defects and pre-dose requirements for sensitization of the 300°C TL peak in natural quartz

Guzzo, Pedro L.; Khoury, Helen J.; Miranda, Milena R.; Barreto, Sandra de Brito

doi:10.1007/s00269-008-0259-x

Cited by 15 publications

(8 citation statements)

References 48 publications

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“…Recently, the possibility to produce a strong TL peak near 300 °C in natural quartzes taken from different deposits was reported [13][14][15] . Combining high doses of γ radiation and heat-treatments, it was possible to increase the TL sensitivity of a 280 °C peak more than 1000 times.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size in the TL response of natural quartz sensitized by high dose of gamma radiation and heat-treatments

et al. 2010

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This work investigates the effect of particle size in the thermoluminescence (TL) response of a quartz crystal that was initially crushed and classified into ten size fractions between 38 μm and 5 mm. Aliquots of each size fraction were sensitized with a dose of 25 kGy of γ rays and heat-treatments at 400 °C. TL glow curves of sensitized and non-sensitized samples were recorded as a function of different test-doses of γ rays. For the non-sensitized samples, the TL peak near 325 °C increases with the decrease in particle size. In the case of sensitized samples, a strong TL peak near 300 °C increases with the increase in particle size up to mean grain size equal to 304 μm. Above 304 μm, an abrupt reduction in the TL intensity is noticed for the sensitized peak. These effects are discussed in relation to the specific surface area of quartz particles and the intensity of the electron paramagnetic resonance signal of the E'1 center induced by the sensitization process

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Section: Introductionmentioning

confidence: 99%

Effect of particle size in the TL response of natural quartz sensitized by high dose of gamma radiation and heat-treatments

et al. 2010

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“…In addition, it was shown that the sensitized signal of this peak increases with the content ratios Li/Al and Li/OH [27]. However, the point defects associated with Li, Al and OH impurities were not properly studied in relation to the sensitization process described before.…”

Section: Introductionmentioning

confidence: 94%

“…Recently, a strong increase in the sensitivity of the TL peak near 280 1C was observed for natural quartz taken from different origins when single crystals were treated with high doses of g radiation and heat [25][26][27]. In addition, it was shown that the sensitized signal of this peak increases with the content ratios Li/Al and Li/OH [27].…”

Section: Introductionmentioning

confidence: 95%

Correlating the TL response of γ-irradiated natural quartz to aluminum and hydroxyl point defects

Souza¹,

Guzzo²,

Khoury³

2010

Journal of Luminescence

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“…The heterogeneity in the spatial distribution of lattice impurities is a common feature in natural single-crystals. After sensitization, it was observed that the TL intensity of the sensitised peak near 300 °C considerably varies even from specimens obtained from the same crystal 12 . In principle, this heterogeneity can be reduced by powdering and homogenization procedures.…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, quartz as a TLD material has only been used during the treatment of food with ionising radiation because this mineral is present in dust particles that are naturally deposited on farming products 10 . However, combining γ doses in the order of 25 kGy and heat-treatments at 400 °C, it has been shown that the TL intensity of some quartz crystals in 280-320 °C region can be sensitized more than 1000 times 11,12 . Until now, the application of this result in TL dosimetry was carried out using quartz discs in the single-crystal form manufactured by ultrasonic machining and lapping 13,14 .…”

Section: Introductionmentioning

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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Point defects and pre-dose requirements for sensitization of the 300°C TL peak in natural quartz

Cited by 15 publications

References 48 publications

Effect of particle size in the TL response of natural quartz sensitized by high dose of gamma radiation and heat-treatments

Effect of particle size in the TL response of natural quartz sensitized by high dose of gamma radiation and heat-treatments

Correlating the TL response of γ-irradiated natural quartz to aluminum and hydroxyl point defects

Manufacturing polycrystalline pellets of natural quartz for applications in thermoluminescence dosimetry

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