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- W2396075842 abstract "Mg2SiO4:Tb phosphor exhibits four thermoluminescence (TL) peaks at 124, 244, 300 and 370 °C for a heating rate of 2 °C/s, 244 °C peak being the main dosimetry peak. The irradiated phosphor exhibits CW-OSL response on stimulation with blue (470 nm) light. Thermal decay of OSL shows that all the TL traps contribute to CW-OSL signal. Its TL and OSL sensitivities are 0.21 and 0.038, respectively, than that of Al2O3:C (Landauer Inc.). Its CW-OSL response increases linearly up to 30 Gy, thereafter increase was supralinear up to the studied dose of 1000 Gy. Electron Spin Resonance (ESR) studies were carried out to study the defect centers induced in the phosphor by gamma irradiation and also to identify the centers responsible for the TL process. Room temperature ESR spectrum of irradiated phosphor appears to be a superposition of at least three distinct centers. One of the centers (center I) with an isotropic g-factor 2.0122 is attributable to an intrinsic O- radical and this correlates with the main TL peak at 244 °C. Center II with an isotropic g-factor 2.0012 is assigned to an F+-center (singly ionized oxygen vacancy) and is the likely recombination center for all the TL peaks. Both the centers grow with radiation dose at least up to 1 kGy. Center III with an axial symmetric g-tensor with principal g-values g||=2.0049 and g⊥=2.0029 is identified as an F+-center and is not related to the observed TL peaks in the phosphor." @default.
- W2396075842 created "2016-06-24" @default.
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- W2396075842 date "2016-09-01" @default.
- W2396075842 modified "2023-10-12" @default.
- W2396075842 title "Thermoluminescence, OSL and defect centers in Tb doped magnesium orthosilicate phosphor" @default.
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- W2396075842 doi "https://doi.org/10.1016/j.apradiso.2016.05.029" @default.
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