Radiation detector employing solid-state scintillator material a

Details Radiation detector employing solid-state scintillator material a Radiation detector employing solid-state scintillator material a

1991-02-01

1996-05-28

Bell, Mark L.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25230117, 2523014R, 501152, C09K 1178

Patent

active

055213871

ABSTRACT:
A polycrystalline ceramic scintillator exhibiting reduced afterglow includes between about 5 and 50 mole percent Gd.sub.2 O.sub.3, between about 0.02 and 12 mole percent of either Eu.sub.2 O.sub.3 or Nd.sub.2 O.sub.3 as a rare earth activator oxide, and between about 0.003 and 0.5 mole percent of either Pr.sub.2 O.sub.3 and Tb.sub.2 O.sub.3 as an afterglow reducer. The remainder of the scintillator composition is Y.sub.2 O.sub.3. The resulting scintillator is especially useful for a radiation detector of the type having a plurality of radiation receiving channels. A scintillator body is disposed in each channel so that radiation being received therein is incident on the scintillator body and causes the body to convert the incident radiation to light energy of a predetermined wavelength. The radiation detector also includes means for converting the light energy from the scintillator into electrical signals which are proportional to the amount of radiation incident on the scintillator body. Methods for preparing the scintillator of the present invention include sintering, sintering combined with gas hot isostatic pressing, and vacuum hot pressing.

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