Composition containing a hafnia phosphor of enhanced luminescence
US4994205A · kind A · utility
34Cited by
13References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Jun 29, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K4/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An intensifying screen for producing a latent image in a silver halide radiographic element when imagewise exposed to X-radiation is disclosed. The screen contains a phosphor having a hafnia host containing zirconia in concentrations higher than those found in optical grade hafnia. The phosphor can include as an activator one or a combination of titanium, rare earth, and alkali metal ions. Phosphor preparation processes are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.