| 摘要 |
<p>An X-ray image intensifier includes an input surface (l8) and an output surface (20) facing the input surface. The input surface has a base (28) and a phosphor layer (30) formed on the base and have a predetermined effective radius. The phosphor layer includes a thickest portion (30a) which has a thickness about l05 to ll5% of a thickness of a center of the layer and is located in a region spaced from the center toward the periphery of the layer by a distance about 60 to 80% of the effective radius. The phosphor layer is formed so that the thickness is gradually increased from the center to the thickest portion and a region between the thickest portion and the periphery of the layer has a thickness about 50 to l00% of the thickness of the thickest portion</p> |
