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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Evaluation of the thermally and optically stimulated response of an Italian Obsidian irradiated in Co-60 beams

Texto completo
Autor(es):
Antonio, Patricia L. [1] ; Oliveira, Raquel A. P. [2] ; Khoury, Helen J. [3] ; Caldas, Linda V. E. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] IPEN, CNEN SP, Comissao Nacl Energia Nucl, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo - Brazil
[2] Univ Fed Vale Sao Francisco, UNIVASF, IPCM, Av Antonio Carlos Magalhaes 510, BR-48902300 Juazeiro, BA - Brazil
[3] Univ Fed Pernambuco, UFPE, DEN, Av Prof Luiz Freire 1000, BR-50740540 Recife, PE - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Radiation Physics and Chemistry; v. 155, n. SI, p. 115-120, FEB 2019.
Citações Web of Science: 0
Resumo

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 Co-60 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. (AU)

Processo FAPESP: 14/12732-9 - Determinação de um sistema de referência e de um dosímetro de rotina utilizando técnicas luminescentes por fototransferência, para dosimetria de doses altas em irradiadores gama
Beneficiário:Patrícia de Lara Antonio
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 08/57863-2 - P&D em metrologia das radiações
Beneficiário:Linda Viola Ehlin Caldas
Linha de fomento: Auxílio à Pesquisa - Temático