Radiation excited phosphor screen and method for manufacturing the same.

摘要

An input phosphor screen includes a substrate (10) having a substantially smooth surface, and first and second phosphor layers (12, 14) both vapor-deposited sequentially on the substrate. The first layer (12) is made of phosphor crystal particles (11) having a mean diameter of 15 µm or less. The second layer (14) has a thickness ten or more times that of the first layer (12) and is made of individual columnar crystals (13) of alkali halide grown vertically on the crystal particles (11), standing close together with fine spaces (15) therebetween. A third layer (16) is preferably deposited on the second layer (14) as a continuous film. These three layers (12, 14, 16) can be deposited by evaporating a phosphor material or materials at a prescribed temperature and at a predetermined degree of vacuum.