Preparation of yttria-gadolinia ceramic scintillators by vacuum

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

1982-06-18

1984-08-21

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Optical fiber, waveguide, or preform

264345, C04B 3332

Patent

active

044669291

ABSTRACT:
Polycrystalline ceramic scintillators are prepared by a vacuum hot-pressing method. The process includes pressing a multi-component powder at high temperature under vacuum. Following a holding period, the pressure and temperature are increased and maintained for a predetermined length of time. 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. The finished scintillator may also include at least one of SrO and CaO as afterglow reducers.

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Carnall et al., "Transparent Gd.sub.2 O.sub.3 Ceramics and Phosphors" Article.
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Rhodes, "Controlled Transient Solid Second-Phase Sintering of Yttria" Journal of the American Ceramic Society, vol. 64, No. 1, Jan. 1981 pp. 13-19.

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