Development of Ce3+-doped magnesium borate glass-ceramic for optically stimulated luminescence dosimetry
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2023
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INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th
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Among several new optically stimulated luminescence (OSL) materials that have been
investigated, magnesium borate has been attracting attention as a host material for dosimetry-based
techniques, such as OSL and thermoluminescence (TL), for reasons such as effective atomic number similar
to water and tissues, and the possibility to produce a neutron sensitive material, by controlling the host
content of 10B isotope. More specifically, Ce3+-doped MgB4O7 has also been proposed as a potential OSL
material for 2D dosimetry, because of its fast luminescence. Although the literature on sintered
MgB4O7:Ce is abundant, the objective of this work is to produce this material (Ce3+-doped magnesium
borate) in the form of glass-ceramic, which has many advantages, such as good formability in complex
shapes, low cost, fast mass production and denser than conventional powder sintered materials, and might
lead to dosimetric improvement. The Ce3+-doped magnesium borate was produced following the
composition of 55B2O3 – 45MgO – 0.3 CeO2 (mol), which was normalized thereafter to obtain 100%.
After being weighted and mixed uniformly, the mixture was melted at ~1250 °C for 1 h, and the final glass
was obtained by splat cooling between two steel plates. Both the powder of ~60 µm and pellets of 5x5
mm2 and 0.6 mm width were obtained for further investigation, which began with a structural analysis of
the material. DSC measurements were performed to define the thermal treatments for crystallization. Five
temperatures were chosen symmetrically between the glass transition range, 630 °C, and the DSC
crystallization peak temperature of 814 °C. Both monoliths and powder were treated at these
temperatures for 3 h, and XRD measurements were carried on the crystallized powder to verify if the
samples underwent crystallization or not. The samples treated at the first two temperatures, 630 °C and
676 °C remained glassy, whereas the samples treated at 722 °C, 768 °C and 814 °C showed XRD peaks
with the same predominant pattern as the reference material for triclinic Mg2BO5 (COD 96-200-3244). A
Risø TL/OSL reader, with an integrated 90Sr/90Y beta source (0.08 Gy/s, in 2023) was used for both
reading and irradiating the samples. The monoliths treated under all conditions underwent a preliminary
dosimetric characterization; first, after being irradiated with 0.8 Gy a TL glow curve was obtained to verify
the peak positions and their thermal stability. Both 630 °C and 676 °C treated samples showed one wide
peak at around 80 °C, which is related to shallow electron traps, while samples treated with 722 °C, 768
°C and 814 °C showed two main peaks, one at 100 °C, and the second, 220 °C, due to shallow and deep
electron traps, respectively. Accounting for the fading of the shallow electron traps, a high reproducibility,
from 0.4% to 4.2% standard deviation, was observed in the OSL measurements. The full dosimetric
characterization is expected to be completed before the conference.
Como referenciar
VASCONCELOS, DANIEL A.A. de; SOUZA, MAURICIO L.; ZANOTTO, EDGAR D.; CALDAS, LINDA V.E. Development of Ce3+-doped magnesium borate glass-ceramic for optically stimulated luminescence dosimetry. In: INTERNATIONAL CONFERENCE ON SOLID STATE DOSIMETRY, 20th, September 17-22, 2023, Viareggio, Italy. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47973. Acesso em: 30 Dec 2025.
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.