Rare-earth-doped yttria-gadolinia ceramic scintillators
US4421671A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1982 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Jun 18, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/2023
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.