Patent ID: 6329662
Filing Date: 2001-12-11
Classification: C09K,G03C,G21K

Abstract:
A combination for radiation image formation which comprises a silver halide photographic material having a support and at least one silver halide emulsion layer provided on each side of the support, and two radiographic intensifying screens each having a support and at least one phosphor layer provided thereon, whereinsaid phosphor layer contains a rare earth phosphor represented by the following formula:M.sub.w O.sub.w X:M'in which M represents at least one rare earth atom selected from the group consisting of Y, La, Gd and Lu; X represents at least one chalcogen atom selected from the group consisting of S, Se and Te, or at least one halogen atom selected from the group consisting of F, Br, Cl and I; M' represents a rare earth atom which activates M; and w is 2 when X is a chalcogen atom or w is 1 when X is a halogen atom,said radiographic intensifying screen contains a fluorescent dye or pigment which absorbs a portion of luminescence emitted by the rare earth phosphor and then emits light in a visible region, andsaid photographic material shows a cross-over of 10% or less when it is placed between the two radiographic intensifying screens and exposed to radiation.