Preparation of yttria-gadolinia ceramic scintillators by sinteri

Details Preparation of yttria-gadolinia ceramic scintillators by sinteri Preparation of yttria-gadolinia ceramic scintillators by sinteri

1984-05-07

1986-02-18

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Optical fiber, waveguide, or preform

264 65, 264 85, 264325, C04B 3550

Patent

active

045713120

ABSTRACT:
Sintering and gas hot isostatic pressing are used to prepare polycrystalline yttria-gadolinia ceramic scintillator bodies. Multicomponent powder compacts, formed by cold pressing and cold isostatic pressing, are sintered to the closed porosity stage. The density of the sintered compacts is then increased by gas hot isostatic pressing. 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, Dy.sub.2 O.sub.3, Pr.sub.2 O.sub.3, and Tb.sub.2 O.sub.3 rare-earth activator oxides. At least one of the oxides of elements Zr, Th, and Ta is included as a transparency promoting densifying agent. At least one of CaO and SrO may be included as a light output restorer.

REFERENCES:
patent: 3562371 (1971-02-01), Bush
patent: 3842012 (1974-10-01), Hoppenbrouwers
patent: 4040845 (1977-08-01), Reclueson
patent: 4147744 (1979-04-01), Rhodeck
patent: 4242221 (1980-12-01), Cusono
Cowell, "Transparent Gd.sub.2 O.sub.3 Ceramics and Phosphors", Materials Research Bulletin, vol. 7, pp. 647-653, 1972.
Grealsovich, "Fabrication of Transparent ThO.sub.2 -Doped Y.sub.2 O.sub.3 ", Am. Cer. Soc. Bull., vol. 52, No. 5, pp. 473-478, (1973).

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