| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-intensity rare-earth oxysulfide phosphor and a radiological image-conversion screen excellent in sensitivity and sharpness. SOLUTION: The rare-earth oxysulfide phosphor is represented by the composition formula: (Ln1-x, REx)2O2S (wherein Ln is at least one selected from the group consisting of Y, Gd, La and Lu; RE is at least one selected from the group consisting of Tb, Eu, Tm and Pr; and x is a number meeting the condition: 1×10-3<=x<=1×10-1) and comprises at least one alkali metal element selected from the group consisting of cesium(Cs) and rubidium(Rb). The radiological image-conversion screen is formed by laminating a phosphor layer made of the phosphor on a substrate.
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