Patent Number: 047330899
Section: claims

1. A radiographic intensifying screen, comprising a support of a plastic film and at least one phosphor layer comprising a binder and a phosphor dispersed therein, in which said support is provided on a surface facing said phosphor layer with a great number of pits having a mean depth of 1-10 .mu.m, inclusive, a maximum depth of more than 1 .mu.m ranging to 50 .mu.m, inclusive, and a means diameter of 10-50 .mu.m, inclusive, whereby light emitted by said phosphor and advancing towards said surface of said support is reflected diffusely. 2. The radiographic intensifying screen as claimed in claim 1, in which said pits have a means depth of 1-5 .mu.m, inclusive. 3. The radiographic intensfying screen as claimed in claim 1, which said pits have a maximum depth of 2-20 .mu.m, inclusive. 4. The radiographic intensifying screen as claimed in claim 1, 2 or 3, in which said binder comprises a linear polyester as a principal component. 5. The radiographic intensifying screen as claimed in claim 1, 2 or 3 in which said binder comprises nitrocellulose as a principal component. 6. The radiographic intensifying screen as claimed in claim 1, 2 or 3, in which said binder comprises a mixture of a linear polyester and nitrocellulose as a principal component. 7. The radiographic intensifying screen as claimed in claim 1, 2 or 3, in which said pits are those formed by applying hard solid particles onto the surface of said support at high speed. 8. A process for the preparation of a radiographic intensifying screen comprising a support of a plastic film and at least one phosphor layer comprising a binder and a phosphor dispersed therein, in which said support is provided on a surface facing said phosphor layer with a great number of pits having a mean depth of 1-10 .mu.m, inclusive, a maximum depth of the than 1 .mu.m ranging to 50 .mu.m, inclusive, and a mean diameter of 10-50 .mu.m, inclusive, said process comprising applying hard solid particles onto said surface of said support at high speed to form said pits.