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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 TL and OSL responses of CaF2:Tm for electron beam processing dosimetry

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Autor(es):
Asfora, Viviane K. [1] ; Antonio, Patricia L. [2] ; Goncalves, Josemary A. C. [2] ; Bueno, Carmen C. [2] ; Barros, Vinicius S. M. de [1] ; Oliveira, Charles N. P. [1] ; Caldas, Linda V. E. [2] ; Khoury, Helen J. [1]
Número total de Autores: 8
Afiliação do(s) autor(es):
[1] Univ Fed Pernambuco DEN UFPE, Dept Energia Nucl, Recife, PE - Brazil
[2] Comissao Nacl Energia Nucl IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Sao Paulo, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Radiation Measurements; v. 140, JAN 2021.
Citações Web of Science: 0
Resumo

The thermoluminescence (TL) and infrared stimulated luminescence (IRSL) responses of in-house produced CaF2: Tm dosimeters are investigated in this work, envisaging their application in electron beam (EB) radiation processing. The irradiations were performed at an industrial EB accelerator (1.5 MeV) covering a dose rate range of 2-8 kGy/s and dose up to 10 kGy. In general, the TL glow curves display four peaks, termed as peaks 2, 3, 4, and 5, corresponding to temperatures at similar to 150, 200, 240, and 300 degrees C, respectively. The intensity of the low temperature peaks (2 and 3) grows with the dose, while the others remain constant (saturated). Nevertheless, an evident dose effect on the glow curves manifests in decreased peak3/peak2 ratio with increasing doses. The CW-IRSL curves exhibit similar patterns with an initial signal increase, followed by an exponential decay. Instead of the normal monotonic decays, these peak-shaped curves might be due to the charge capture competition between empty shallow traps and recombination centers. Both TL and IRSL intensities increase linearly with doses up to 6 kGy, and for higher doses, they become sub-linear with a saturation trend around 10 kGy. Another common feature of TL/IRSL response is its dose rate dependence, being more sensitive at higher dose rates. Despite being dose-rate dependent, the CaF2:Tm dosimeters might be suitable for EB processing dosimetry. However, for their use as routine dosimeters, relevant dosimetric characteristics, such as fading and response reproducibility, have to be investigated. Work in this direction is underway. (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