Abstract: In a radiation image read-out apparatus, a phosphor sheet (70), represented by the formula Gd.sub.2 O.sub.2 S:Tb.sup.3+, is located facing a stimulable phosphor sheet (10) in such a manner that when it is exposed to x-rays (44) it produces fluorescence (71) having a wavelength that fall within the stimulation wavelength range of the stimulable phosphor. When the stimulable phosphor sheet (10) is exposed to the fluorescence (71), part of the energy stored on the layer of stimulable phosphor during its exposure to the x-rays (44) is released. In this manner, the stimulable phosphor sheet (10) is approximately simultaneously subjected to the operation for recording the radiation image and the operation for slightly erasing the energy store thereon during its exposure to the x-rays (44).

Abstract: In a radiation image read-out apparatus, a stimulable phosphor sheet, which has been exposed to radiation which has passed through an object whose radiation absorptivity is basically distributed with predetermined characteristics, is exposed to stimulating rays which cause the stimulable phosphor sheet to emit light in proportion to the amount of energy stored thereon during its exposure to the radiation. The light, which is emitted by the portion of the stimulable phosphor sheet exposed to the stimulating rays, is detected with a photoelectric read-out device, and an image signal representing a radiation image of the object is thereby obtained. An optical filter is located between the stimulable phosphor sheet and the photoelectric read-out device such that the position of the optical filter corresponds to the position of the radiation image of the object stored on the stimulable phosphor sheet.

Abstract: A method of recording a radiation image having excellent sharpness which comprisesimage-wise exposing to radiation, in combination with the use of a fluorescent intensifying screen, a light-sensitive photographic element comprising a water-proof opaque support, which has an average degree of reflection of about 70 percent or greater, based on the degree of reflection of a magnesium oxide white plate being 100%, in the spectral wavelength region of from about 380 m.mu. to about 600 m.mu., and having on only one surface thereof a coating of a green sensitized silver halide photographic emulsion containing a phenolic color coupler or an .alpha.-naphtholic color coupler, each capable of forming a quinoneimine dye having a maximum absorption within a spectral wavelength region of about 550 m.mu. to about 700 m.mu. on color development, where the silver halide grains of the emulsion have a number average grain size of about 0.5.mu. to about 2.2.mu. and are present in an amount of from about 0.