Hole-trap-compensated scintillator material and computed tomogra

Details Hole-trap-compensated scintillator material and computed tomogra Hole-trap-compensated scintillator material and computed tomogra

1994-05-27

1995-02-21

Cooper, Jack

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

2504831, 2523014R, G01T 1202, C09K 1180

Patent

active

053918762

ABSTRACT:
Afterglow in a luminescent material in which a significant factor in afterglow is the release of holes from hole traps in the scintillator material is substantially reduced by adding cerium as a hole-trapping species to the scintillator composition which successfully competes with the hole traps in the basic scintillator composition. In gadolinium gallium garnet activated with chromium, the addition of cerium in the range of 0.2 to 0.255 weight percent reduces afterglow in this manner while exhibiting excellent stability to x-ray damage after exposure to an initial pair of x-ray pulses.

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D. J. Robbins et al., "The Temperature Dependence of Rare-Earth Activated Garnet Phoslphors-II". A Comparative Study of Ce.sup.3+ Eu.sup.3+, Tb.sup.3+, and Gd.sup.3+ in Y.sub.3 Al.sub.5 O.sub.12, J. Electrochemical Society, vol. 126, No. 7, Jul. 1979, pp. 1221-1228.
D. J. Robbins et al., "The Relationship Between Concentration and Efficiency in Rare Earth Activated Phosphors", vol. 126, No. 9, Sep. 1979, pp. 1556-1563.
D. J. Robbins et al., "The Effects of Core Structure on Radiative and Non-Radiative Recombinations at Metal Ion Substituents in Semiconductors and Phosphors", Advances in Physics, vol. 27, No. 4, 1978, pp. 499-532, No Month.
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