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

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...

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) Vol. 13; no. 2; pp. 265 - 271
Main Authors: Carvalho Jr, Álvaro Barbosa de, Guzzo, Pedro Luiz, Sullasi, Henry Lavalle, Khoury, Helen Jamil
Format: Journal Article
Language:English
Published: ABM, ABC, ABPol 01-06-2010
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects:
ENGINEERING, CHEMICAL
EPR spectroscopy
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
natural quartz
particle size
thermoluminescence
particle size
natural quartz
thermoluminescence
EPR spectroscopy
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Summary: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.
ISSN:1516-1439
1980-5373
1516-1439
DOI:10.1590/S1516-14392010000200023