Evaluation of the thermally and optically stimulated response of an Italian Obsidian irradiated in 60Co beams
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Radiation Physics and Chemistry
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From Obsidian silicate, in its natural form, pellets were manufactured adding Teflon to the material in powder.
These pellets were exposed to the gamma radiation beams of a 60Co source in a dose interval from 10 Gy to
10 kGy. The Obsidian in powder was investigated in relation to its physical and chemical characteristics, by
means of the X-ray diffraction, scanning electronic microscopy and energy-dispersive X-ray spectroscopy techniques.
After the irradiation procedure, the signal of the samples was evaluated by means of three techniques:
thermoluminescence (TL), optically stimulated luminescence (OSL) and thermally stimulated exoelectron
emission (TSEE). The objective of this work was to verify the TL, OSL and TSEE response of the Obsidian+Teflon
pellets after exposure to high doses of gamma radiation. Different response characterization tests were performed,
as TL and TSEE emission curves, OSL signal decay, reproducibility, dose-response curves, lower detection
limits and fading. From these results, it can be observed that the Obsidian+Teflon pellets present good
conditions to be used as high dose gamma radiation detectors; the results obtained with the OSL technique were
the most adequate in terms of response in function of absorbed dose. The fading of the signals, varying from
about 26% (TSEE) to 44% (OSL), in a time interval of 360 h post-irradiation, also showed favorable results for
the use of this material as radiation detector, when the measurements are taken after a defined time interval.
Como referenciar
ANTONIO, PATRICIA L.; OLIVEIRA, RAQUEL A.P.; KHOURY, HELEN J.; CALDAS, LINDA V.E. Evaluation of the thermally and optically stimulated response of an Italian Obsidian irradiated in 60Co beams. Radiation Physics and Chemistry, v. 155, p. 115-120, 2019. SI. DOI: 10.1016/j.radphyschem.2018.06.034. Disponível em: http://repositorio.ipen.br/handle/123456789/29834. Acesso em: 20 Mar 2026.
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