Development of CaSO4:TR,Li (TR = Tm, Eu, Tb) composites for beta radiation dosimetry by means of luminescent techniques
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2023
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INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th
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The study of new dosimetric materials for investigations in ionizing radiation dosimetry is
extremely important to provide sensitive and low-cost detectors. Thus, this work proposed the
development of CaSO4:Tm,Li, CaSO4:Tb,Li and CaSO4:Eu,Li composites for application in beta radiation
dosimetry, using luminescent techniques such as thermoluminescence (TL) and optically stimulated
luminescence (OSL). The CaSO4 crystals were produced by the adapted slow evaporation route and
characterized using X-ray diffraction (XRD), radioluminescence, TL and OSL techniques. XRD analyses
showed that the doped CaSO4 samples presented a single phase, with orthorhombic symmetry. The
CaSO4:Eu,Li composites showed TL signals between 100°C and 200°C, with peaks around 145°C and
180°C. The CaSO4:Tb,Li and CaSO4:Tm,Li composites showed TL signals between 100 ºC and 350 ºC,
with peaks around 165 ºC and 275 °C. All samples were irradiated with a 90Sr/90Y source from the
TL/OSL Risø reader. For the CaSO4:Tb and CaSO4:Tm samples, the addition of lithium as co-dopant
resulted into a significant increase (2x) in the total TL signal of the samples. The CaSO4:Tm,Li samples
presented a very intense OSL signal, about 80x greater than the signal of the other samples produced. This
allows the applicability of TL/OSL detectors even more sensitives. The OSL decay of the CaSO4:Eu,Li and
CaSO4:Tb,Li samples is dominated by a fast decay while the OSL signal of CaSO4:Tm,Li composites decays
slowly and remains stored for a long time. The TL emission spectra of the samples showed typical emissions
of Eu2+ ions (280 nm), Eu3+ (614 nm), Tb3+ (544 nm) and Tm3+ (455 nm). As no emission corresponding
to lithium was identified in the emission spectra, it can be assumed that lithium acts as a capture center and
transfers its energy to the nearby TR3+, which increases the emission intensity. All the samples produced
showed linearity in the dose range used, good reproducibility, with variations below 10%, and minimum
detectable doses of the order of micrograys. The evaluated dosimetric characteristics denote that the
developed composites have potential application as TL/OSL dosimeters.
Como referenciar
JUNOT, DANILO O.; GALEANO, DIEGO C.; SOUZA, DIVANIZIA N.; CALDAS, LINDA V.E. Development of CaSO4:TR,Li (TR = Tm, Eu, Tb) composites for beta radiation dosimetry by means of luminescent techniques. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th, September 17-22, 2023, Viareggio, Italy. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47976. Acesso em: 09 May 2024.
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.