Patent Number: 
Section: claims

1. A radiation image conversion panel comprising:a substrate; anda phosphor layer of columnar crystals formed on said substrate by vapor-phase deposition, with a column diameter distribution of said columnar crystals having two or more peaks. 2. The radiation image conversion panel according to claim 1, wherein said two or more peaks of said column diameter distribution satisfy Expression:0.4R≦r≦0.8Rwherein R is a column diameter at a largest column diameter peak and r is a column diameter at any one of the remainder in said two or more peaks of said column diameter distribution. 3. The radiation image conversion panel according to claim 1, wherein said phosphor layer comprises a stimulable phosphor represented by a general formula “CsBr:Eu”. 4. A process for producing a radiation image conversion panel comprising the steps of:preparing a substrate on which two or more types of projections different in diameter are formed and satisfies Expression “0.4R≦r≦0.8R” where R is a diameter of a largest projection and r is a diameter of any one of the remainder in said two or more types of projections, thereby making a surface of said substrate uneven; andforming a phosphor layer on said uneven surface of said substrate by vapor-phase deposition.