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Radiation detector employing solid-state scintillator material and preparation methods therefor

  • US 5,521,387 A
  • Filed: 02/01/1991
  • Issued: 05/28/1996
  • Est. Priority Date: 12/30/1985
  • Status: Expired due to Term
First Claim
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1. A radiation detector for a computerized tomography scanner exhibiting improved afterglow characteristics when used with a source of penetrating x-ray radiation, said radiation detector comprising:

  • a detector array housing;

    a plurality of channels defined in said housing, for receiving said radiation;

    a polycrystalline ceramic scintillator body disposed in each said channel so that x-ray radiation being received by said channel is incident on said scintillator body, and so that said incident radiation causes said body to scintillate at a wavelength, the composition of said scintillator body consisting essentially of between about 5 and 50 mole percent Gd2 O3, between about 0.02 and 12 mole percent of a rare earth activator oxide selected from the group consisting of Eu2 O3 and Nd2 O3, and between about 0.008 and 0.5 mole percent of at least one afterglow reducer selected from the group consisting of Pr2 O3 and Tb2 O3, the remainder of said composition being Y2 O3 ; and

    means for detecting said wavelength scintillator energy emitted from each said scintillator body and for generating electrical signals in response thereto, said detecting means being coupled to each said scintillator body so as to produce a set of signals related to the x-ray radiation received in the respective channels of said detector array housing.

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