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• W2056083476 abstract "Abstract Single crystals of nominally pure thorium dioxide were annealed for 2 hr at 1400°C in an atmosphere of CO. The reduced crystals were excited with uv radiation and the resulting thermoluminescence (TL) measured in the temperature range 20–360°C at a heating rate of 1.5°C sec −1 . The complex thermoluminescence profiles were resolved into individual bands with maxima at 219, 246, 271, 297, and 344°C. Measurement of the TL emission spectra indicates the existence of four “electron-hole” recombination centers. The main emission is a sharp-line doublet at 496 and 503 nm. Ultraviolet excitation also produced visible fluorescence. Two broad bands were observed at 447 and 565 nm giving rise to “blue” and “orange” fluorescence, respectively. A sharp-line spectrum was identified with peaks at 492, 496, and 503 nm. The sharp-line fluorescence spectrum is similar to the main TL recombination center emission spectrum. The spectrum is due to Pr 3+ ions. Doping with Ca 2+ and Y 3+ greatly reduces both the thermoluminescence and the sharp-line fluorescence. The evidence suggests a model which involves “hole” capture by Pr 3+ ions during uv excitation and conversion to Pr 4+ . Subsequent heating liberates trapped electrons which combine with the Pr 4+ ions producing excited Pr 3+ ions. These relax to the ground state by emission of characteristic radiation." @default.
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• W2056083476 date "1975-01-01" @default.
• W2056083476 modified "2023-09-26" @default.
• W2056083476 title "Thermoluminescence and fluorescence in thoria" @default.
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• W2056083476 doi "https://doi.org/10.1016/0022-4596(75)90309-6" @default.
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