Solid state scintillator and treatment therefor

Details Solid state scintillator and treatment therefor Solid state scintillator and treatment therefor

C - Chemistry, Metallurgy

09

K

358/11, 31/124,

C09K 11/78 (2006.01)

Patent

CA 1315089

15-CT-2929 SOLID STATE SCINTILLATOR AND TREATMENT THEREFOR ABSTRACT OF THE DISCLOSURE A polycrystalline ceramic scintillator is disclosed for radiographic applications which has received a controlled oxidation anneal to reduce radia- tion damage otherwise occuring when said scintillator is exposed to X radiation during conversion of said X radiation to the display image. The particular ceramic material treated in said manner comprises a densely sintered rare earth doped gadolinia containing metal oxide having a cubic crystal structure which has been annealed after sintering in a controlled oxygen containing atmosphere. A preferred ceramic composition comprises from about 5 mole percent up to about 50 mole percent Gd2O3, between about 0.5 mole percent and 12 mole percent of a rare earth activator oxide selected from the group consisting of Eu2O3 and Nd2O3, and between about .0001 and 0.5 mole percent of at least one after- glow reducer selected from the group consisting of Pr2O3 and Tb2O3, and the remainder of said composition being Y2O3. A treatment to produce said improved x-ray conversion medium is also disclosed along with radio- graphic imaging systems and methods employing said improved x-ray image conversion medium.

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