A process for the preparation of niobium activated yttrium - tantalate - phosphorus for x-rays with improved brightness.

摘要

PURPOSE: To obtain the captioned X-ray phosphor improved in brightness by mixing a uniform mixture of raw components including yttrium oxide, etc., with a specified eutectic flux and then baking the resulting mixture under specified conditions, followed by washing, drying, classifying, etc. ;CONSTITUTION: The following components are mixed uniformly: (A) 1 mol of yttrium oxide, (B) 0.995 mol of tantalum oxide, (C) 0.005 mol of niobium oxide, and (C) 0.001 to 0.01 mol of a rubidium halide or cesium halide. The resulting mixture is mixed with a eutectic flux of lithium chloride/lithium sulfate and is then baked at about 1,200 to 1,300°C (2192 to 2312 °F) for about 10 to 12 hours. After the obtained phosphor is washed in deionized water to remove the flux, it is filtered and dried, and the particles are classified to obtain the intended X-ray phosphor.;COPYRIGHT: (C)1991,JPO