Abstract: A phosphor panel is composed of a phosphor layer consisting essentially of phosphor in the form of columnar crystals and a protective layer provided on the phosphor layer via an adhesive layer, in which the adhesive layer has a thickness of 0.3 ?m or more and intrudes into the phosphor layer in a depth of 2.0 ?m or less.

Abstract: In a radiation-image conversion panel, a fluorescent layer containing a phosphor and a protective layer are formed on a support in this order. The protective layer has a water-vapor transmission rate of 1 g/m2/24 h or lower at 40° C. and a reflectance of 3% or lower at a wavelength of light emitted from the phosphor. In addition, the protective layer may be obtained by attaching a removable film to a thin transparent film so as to produce a laminated film, forming a vapor-barrier layer on an exposed surface of the thin transparent film by vacuum deposition so as to produce a moisture-resistant film, placing the moisture-resistant film on the fluorescent layer, and removing the removable film from the moisture-resistant film.

Abstract: Fused solid of an europium halide containing a less amount of europium oxyhalide impurities is prepared by a process in which a starting europium halide is heated to fuse in the presence of a halogen source and then cooled to give the fused solid.

Abstract: A radiation image storage panel is composed of a phosphor layer formed by a gas phase-accumulation method and a transparent protective film glued thereon via an adhesive layer, in which the adhesive layer is made of a resin material having Tg of higher than 35° C. in an amount of 40 to 100 wt. % and a resin material having Tg of not higher than 35° C. in an amount of 60 to 0 wt. %.

Abstract: A radiation image storage panel comprises a substrate, a stimulable phosphor layer, which is constituted of a stimulable phosphor, and a transparent water vapor proof film, which is constituted of a water vapor proof layer and a transparent thin film. The substrate, the stimulable phosphor layer, and the transparent water vapor proof film are overlaid in this order. The transparent water vapor proof film is overlaid via an adhesive layer on the stimulable phosphor layer. The transparent thin film has a thickness falling within the range of 1 ?m to 10 ?m. The radiation image storage panel has good water vapor proof characteristics and is capable of yielding an image of good image quality with a high sensitivity.

Abstract: A phosphor layer of a radiation image conversion panel has a thickness of 100 to 300 ?m and a relative density of 65 to 80%. When a radiation image taken on the conversion panel is reproduced, the size of excitation light d for reading the radiation image satisfies the expressions: d?5r and d?3p wherein r is the average column diameter of the columnar crystals in the phosphor layer of the radiation image conversion panel and p is the pixel size of the reproduced image. The radiation image conversion panel and a radiation image diagnostic system using such a conversion panel are suitable for an application such as mammography in which soft tissue is imaged as the principal subject with low radiation energy.

Abstract: In a radiation image storage panel composed of a phosphor layer produced by vapor phase deposition, the phosphor layer is composed of an europium activated cesium halide stimulable phosphor and exhibits an ultraviolet light-excited emission spectrum satisfying the condition of: 0<S(400–420)<0.20 in which S(400–420) represents a ratio of an amount of a light emitted by a luminous component giving an emission peak in the region of 400 to 420 nm based on the total amount of emitted light.

Abstract: A radiation image storage panel is composed of a phosphor layer consisting essentially of phosphor in the form of columnar crystals and a protective layer provided on the phosphor layer via an adhesive layer, in which the adhesive layer has a thickness of 0.3 ?m or more and intrudes into the phosphor layer in a depth of 2.0 ?m or less.

Abstract: A radiation image storage panel is composed of a phosphor layer formed by a gas phase-accumulation method and a transparent protective film glued thereon via an adhesive layer, in which the adhesive layer is made of a resin material having Tg of higher than 35° C. in an amount of 40 to 100 wt. % and a resin material having Tg of not higher than 35° C. in an amount of 60 to 0 wt. %.

Abstract: A radiation image storage panel comprises a substrate, a stimulable phosphor layer, which is constituted of a stimulable phosphor, and a transparent water vapor proof film, which is constituted of a water vapor proof layer and a transparent thin film. The substrate, the stimulable phosphor layer, and the transparent water vapor proof film are overlaid in this order. The transparent water vapor proof film is overlaid via an adhesive layer on the stimulable phosphor layer. The transparent thin film has a thickness falling within the range of 1 ?m to 10 ?m. The radiation image storage panel has good water vapor proof characteristics and is capable of yielding an image of good image quality with a high sensitivity.

Abstract: In a radiation-image conversion panel, a fluorescent layer containing a stimulable phosphor and a protective layer are formed on a support in this order. The protective layer has a water-vapor transmission rate of 1 g/m2/24h or lower at 40° C. and a reflectance of 3% or lower at a wavelength of light emitted from the stimulable phosphor. In addition, the protective layer may be obtained by attaching a removable film to a thin transparent film so as to produce a laminated film, forming a vapor-barrier layer on an exposed surface of the thin transparent film by vacuum deposition so as to produce a moisture-resistant film, placing the moisture-resistant film on the fluorescent layer, and removing the removable film from the moisture-resistant film.

Abstract: A radiation image storage panel having a phosphor layer which is composed of a phosphor having a matrix component and an activator component is prepared by the steps of forming on a substrate a lower prismatic crystalline layer composed of the matrix component by vapor deposition; and forming on the lower prismatic crystalline layer an upper prismatic crystalline layer composed of the matrix component and the activator component by vapor deposition.

Abstract: An improvement of a process for preparing a radiation image storage panel by heating an evaporation source containing a phosphor in a deposition apparatus to produce its vapor and depositing the vapor on a substrate to form a phosphor layer resides in that the heating and depositing are performed under such condition that an inert gas is introduced into the apparatus at a flow rate of Vn satisfying the following condition, while the apparatus is being evacuated, 0.002?Vn/Vc?20 [Vn is a flow rate in terms of mL/min., and Vc is a volume of the apparatus in terms of L].

Abstract: Fused solid of an europium halide containing a less amount of europium oxyhalide impurities is prepared by a process in which a starting europium halide is heated to fuse in the presence of a halogen source and then cooled to give the fused solid.

Abstract: In a radiation image storage panel composed of a phosphor layer produced by vapor phase deposition, the phosphor layer is composed of an europium activated cesium halide stimulable phosphor and exhibits an ultraviolet light-excited emission spectrum satisfying the condition of:

Abstract: A method for preparing a radiation image storage panel by heating an evaporation source of phosphor material or starting materials for the phosphor material under reduced pressure to produce a vapor of the phosphor material or starting materials and deposit the vapor on a substrate to form a phosphor layer is favorably performed by using an evaporation source having a water content of not more than 0.5 weight %, preferably under the conditions of a partial pressure of water of 7.0×10−3 Pa or lower and a partial pressure of hydrocarbon of 1.0×10−6 Pa or lower.

Abstract: A radiation image storage panel having a phosphor layer which is composed of a phosphor having a matrix component and an activator component is prepared by the steps of forming on a substrate a lower prismatic crystalline layer composed of the matrix component by vapor deposition; and forming on the lower prismatic crystalline layer an upper prismatic crystalline layer composed of the matrix component and the activator component by vapor deposition.

Abstract: In a radiation image storage panel comprising a stimulable phosphor layer and a protective film placed thereon, the protective film is made of a film of plastic material and a layer of a fluororesin-containing resin composition coated on the phosphor layer. The coated layer is prepared by coating a solution of a resin composition containing not less than 30 weight % of a fluororesin and drying thus coated solution layer.

Abstract: A radiation image storage panel comprises a stimulable phosphor layer, a cushioning layer and a coated protective layer, wherein the cushioning layer shows an elongation at rupture more than that of the protective layer.

Abstract: A radiation image storage panel having a stimulable phosphor layer and an improved protective film is disclosed. The improved protective film is produced from a mixture of a film-forming resin and an oligomer having a polysiloxane skeleton or a perfluoroalkyl group. The improved protective film can be a coated layer containing a fluorocarbon resin which is soluble in an organic solvent. Otherwise, the improved protective film can be produced by coating on the phosphor layer a mixture of a film-forming resin composition containing a fluorocarbon resin which is soluble in an organic solvent, and a powdery resin of perfluoroolefin or silicone.