Preparation of yttria-gadolinia ceramic scintillators by sintering and gas hot isostatic pressing
US4518546A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1984 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | May 8, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Sintering and gas hot isostatic pressing are used to prepare polycrystalline yttria-gadolinia ceramic scintillator bodies. Multi-component powder compacts, formed by cold pressing 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. The finished scintillator may also include at least one of SrO and CaO as afterglow reducers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.