Evaluation of the thermally and optically stimulated response of as Italian Silicate irradiated in 60Co beams
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2017
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INTERNATIONAL TOPICAL MEETING ON INDUSTRIAL RADIATION AND RADIOISOTOPE MEASUREMENT APPLICATIONS, 10th
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In this work, pellets were manufactured in a proportion of 2:1 of powdered samples of
Obsidian black:Teflon (dimensions of 6.0 mm in diameter and 0.8 mm in thickness). The
pellets were irradiated using a Gamma-Cell 220 System, model 200, Atomic Energy of
Canada LTD (60Co). The TL and OSL responses were analyzed using the reader
system composed by the TL/OSL meter Risø, model TL/OSL-DA-20, and the TSEE
response was obtained using a homemade reader system developed at the Calibration
Laboratory, at IPEN. After the TL, OSL and TSEE measurements, the pellets were
thermally treated at 400 °C during 1 h, for reutilization. The physical and chemical
characterization of powdered Obsidian was also investigated using the X-ray diffraction,
XRD (using a diffractometer Equinox 1000, Inel), scanning electron microscope, SEM, and energy dispersive X-ray spectroscopy, EDX (the last two using a scanning electron
microscope with an energy dispersive X-ray microanalyser Vega 3 SEM, Tescon)
techniques. The results proved, basically, that Obsidian is a natural glass and
composed mainly of silica (82.4%). The TL glow curve revealed a dosimetric peak at the
temperature of 220 °C, and the TSEE emission curve showed a peak at about 300 °C.
The results obtained in the reproducibility of response test were: 2.9% (TL), 3.0%
(TSEE) and 3.1% (OSL). The lower detection limits were: 48.1 Gy (TL), 18.1 Gy (TSEE)
and 79.3 Gy (OSL). The dose-response curves showed, in the case of TL, a
supralinearity behavior between only 500 Gy and 2 kGy with a following saturation of
the response. For the TSEE response, a sublinearity was seen with a following
saturation of the response. For the OSL technique, linearity could be observed in the
interval from 500 Gy to 2 kGy and then a tendency to saturation.
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 as Italian Silicate irradiated in 60Co beams. In: INTERNATIONAL TOPICAL MEETING ON INDUSTRIAL RADIATION AND RADIOISOTOPE MEASUREMENT APPLICATIONS, 10th, July 09-13, 2017, Chicago, IL, USA. Abstract... p. 58-59. Disponível em: http://repositorio.ipen.br/handle/123456789/27946. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.