Rare-earth-doped yttria-gadolinia ceramic scintillators

Details Rare-earth-doped yttria-gadolinia ceramic scintillators Rare-earth-doped yttria-gadolinia ceramic scintillators

1982-06-18

1983-12-20

Cooper, Jack

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

2504831, 2523014R, 501152, C09K 11477

Patent

active

044216718

ABSTRACT:
Rare-earth-doped, polycrystalline yttria-gadolinia ceramic scintillators with high density, optical clarity, uniformity, cubic structure and which are useful in the detection of X-rays, include one or more of the oxides of rare-earth elements Eu, Nd, Yb, Dy, Tb, and Pr as activators. The oxides of elements Zr, Th, and Ta are included as transparency-promoting densifying agents. Any decrease in scintillator light output, due to the addition of transparency promoting additives, may be partially restored by the addition of either calcium oxide (CaO) or strontium oxide (SrO). Sintering, sintering combined with gas hot isostatic pressing, and hot pressing methods for preparing the ceramic scintillators are also described.

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Carnall et al., "Transparent Gd.sub.2 O.sub.3 Ceramics and Phosphors" article.
Lefever et al., "Transparent Yttrium Oxide Ceramics", 1967, pp. 865-869.
Buchanan et al., "Cathodoluminescent Properties of the Rare Earths in Yttrium Oxide", Journal of Applied Physics, vol. 39, No. 9, Aug. 1968, pp. 4342-4347.
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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