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- W1984920809 abstract "CaSO(4):Dy, CaSO(4):(Dy, Bi) and CaSO(4):Bi phosphors were prepared through re-crystallization method. Thermoluminescence (TL) characteristics of these phosphor samples were investigated. The radiation induced radical ions formed in these phosphors were investigated using electron paramagnetic resonance (EPR) spectroscopy. The main signals observed in both CaSO(4):(Dy, Bi) and CaSO(4):Bi were identified as SO(4)(-) (II), SO(4)(-) (⊥) and SO(3)(-) (isotropic) with g values 2.023, 2.0089 and 2.004, respectively. In order to understand the TL mechanism, CaSO(4):(Dy, Bi) phosphor samples were annealed between 100 and 250 °C and their EPR spectra were studied. It was observed that EPR signal intensities reduce drastically in 250 °C annealed phosphor confirming the role of SO(4)(-) and SO(3)(-) types of defect centers in the dosimetric peak. The reduction in the TL sensitivity with increase in Bi(3+) co-dopant in the phosphor samples was correlated with quenching of TL by Bi(3+) ions rather than the reduction in the concentration of the above defect centers. An effort was also made to use the Bi(3+) co-doped CaSO(4):Dy phosphor for dosimetry of chilled or frozen food irradiation." @default.
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- W1984920809 date "2011-01-01" @default.
- W1984920809 modified "2023-10-17" @default.
- W1984920809 title "EPR-TL correlation studies on Bi co-doped CaSO4:Dy phosphor" @default.
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- W1984920809 doi "https://doi.org/10.1016/j.apradiso.2010.09.014" @default.
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