Patent Number: 
Section: abstract

An intensifying screen, comprising a support, a phosphor layer disposed on the support and a protecting film disposed on the phosphor layer. The phosphor layer comprises a first phosphor layer formed on the support side and constituted of particles of the first phosphor having average particle diameter D1 and range coefficient k, which expresses a particle size distribution, in the range of 1.3 to 1.8, and a second phosphor layer formed on the protective film side and constituted of particles of the second phosphor having average particle diameter D2 ( greater than D1) and range coefficient k, which expresses a particle size distribution, in the range of 1.5 to 2.0. The ratio (CW1:CW2) of coating weight per unit area of the particles of the first phosphor in the first phosphor layer CW1 and coating weight per unit area of the particles of the second phosphor in the second phosphor layer CW2 is in the range of from 8:2 to 6:4. According to such intensifying screens, even when phosphors of, for instance, high emission efficiency are employed, while preventing lowering of speed and sharpness from occurring, granularity can be improved.