| 摘要 |
<p>X-ray phosphor consisting essentially of Gd1-XBO3:CeX wherein X is 0.001 to 0.09 and process of preparation wherein reactant sources of gadolinium, boron and cerium, e.g., oxides, and flux, e.g., mixture of alkali metal halide and tetraborate, mixture of alkali metal sulfates, are mixed and fired at a temperature in excess of that required to melt the flux, leaching out the flux with water and drying to obtain substantially spherical particles, 0.5 to 20 mu m in average diameter. The X-ray phosphor is useful in an X-ray screen which is used in combination with a silver halide, e.g., silver bromide emulsion.</p> |
