Method for sintering high density yttria-gadolinia ceramic scintillators
A method for preparing high density yttria-gadolinia ceramic scintillators includes cold-pressing a multicomponent powder to form powder compacts and then sintering the compacts to form transparent-to-translucent ceramic scintillator bodies. The powder compacts are formed by either die pressing or die pressing followed by isostatic pressing to further increase green density. The powder compacts are sintered in vacuum or a reducing atmosphere at a temperature of between 1800/sup 0/ C. and 2100/sup 0/ C. The preferred heating sequence includes a holding period at a temperature lower than the final sintering temperature. The finished scintillator includes Y/sub 2/O/sub 3/, Gd/sub 2/O/sub 3/, and one or more of Eu/sub 2/O/sub 3/, Nd/sub 2/O/sub 3/, Yb/sub 2/O/sub 3/, Pr/sub 2/O/sub 3/ Dy/sub 2/O/sub 3/, and Tb/sub 2/O/sub 3/ rare earth activator oxides. The finished scintillator may also include at least one of SrO and CaO as afterglow reducers.
- Assignee:
- General Electric Company
- Patent Number(s):
- US 4473513
- OSTI ID:
- 6140321
- Resource Relation:
- Patent File Date: Filed date 18 Jun 1982; Other Information: PAT-APPL-389818
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
GADOLINIUM OXIDES
COMPACTING
SINTERING
SCINTILLATOR-PHOTODIODE DETECTORS
FABRICATION
YTTRIUM OXIDES
CALCIUM OXIDES
COMPACTS
COMPUTERIZED TOMOGRAPHY
DYSPROSIUM OXIDES
EUROPIUM OXIDES
NEODYMIUM OXIDES
POWDERS
PRASEODYMIUM OXIDES
STRONTIUM OXIDES
TERBIUM OXIDES
YTTERBIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
DIAGNOSTIC TECHNIQUES
DYSPROSIUM COMPOUNDS
EUROPIUM COMPOUNDS
GADOLINIUM COMPOUNDS
MEASURING INSTRUMENTS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
RADIATION DETECTORS
RARE EARTH COMPOUNDS
SCINTILLATION COUNTERS
STRONTIUM COMPOUNDS
TERBIUM COMPOUNDS
TOMOGRAPHY
TRANSITION ELEMENT COMPOUNDS
YTTERBIUM COMPOUNDS
YTTRIUM COMPOUNDS
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
550602 - Medicine- External Radiation in Diagnostics- (1980-)