Photoluminescent materials for radiography

Details Photoluminescent materials for radiography Photoluminescent materials for radiography

1987-12-01

1989-08-08

Morgenstern, Norman

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2503232, 25230145, 2523014H, 264 21, 427 64, 430139, H05B 3300, C09K 1108, G03C 516, B05D 506

Patent

active

048556033

ABSTRACT:
Photoluminescent materials for radiography are prepared using a base material, first and second dopants and a fusible salt. The base material is an alkaline earth metal sulfide such as strontium sulfide. Lithium fluoride is used to enhance the interdiffusion of materials. Samarium and cerium sulfide are used as the first and second dopants. Improved performance may be achieved by adding barium sulfate and/or cesium iodide. The photoluminescent material is made according to a process involving heating of the material to a fusing temperatue, grinding the material after cooling, and reheating the material to below the fusing temperature, but sufficiently high to repair the crystal surfaces. When cesium iodide is added it is mixed in after the grinding step. The material is then placed in a transparent binder and applied to a substrate, or deposited as a thin film directly on a substrate for different uses.

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