| 摘要 |
PURPOSE: To provide a phosphor image screen of high sensitivity to the light and the weakβrays, by installing a phosphor layer including accelerated phosphor on a base, and coating the surface of the layer with a protective coating composed of a para-xylylen polymer of a specific formula. CONSTITUTION: An optionally substituted para-xylylen polymer represented by the formula, is used as a protective coating. (In the formula, R1, R2, R3 and R4 are independently selected from a group of H, alkyl, aryl, heteroaryl, alkenyl, cyano, alkoxyl, hydroxyl, aryloxyl, carboxyl, carboxyalkyl, carboxyaryl, halogen, amino and nitro. The n is not less than 1000.) The thickness of the protective coating is 25-50μm in the desirable operating condition, and 0.10-10μm in the other condition. The image of high sensitivity, contrast and reproducibility can be obtained by the comparatively short irradiation time by using this phosphor screen.
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