Konica Minolta Medical and Graphic, Inc.

Konica Minolta, Inc.

Keiko Maeda

Tetsuo Shima

Yasushi Nagata

Atsushi Hasegawa

Musashi Matsumoto

A radiation image conversion panel having a high luminance and sharpness is provided by growing columnar crystals from the root portion. The radiation image conversion panel includes a support; and a phosphor layer mainly composed of an alkali halide, the phosphor layer being formed by vapor deposition; wherein the phosphor layer includes a plurality of domains formed of a plurality of phosphor columnar crystals; each of the domains is a single phosphor columnar crystal or an aggregation of phosphor columnar crystals having substantially the same crystal orientation, and has an average diameter of 0.2 to 10 &#x3bc;m; and the phosphor columnar crystals are crystalline from root portion at which crystal growth started.

Radiation image conversion panel

An object of the invention is to provide radiographic image conversion panels which realize high levels of brightness and sharpness when used as scintillator panels and which also ensure sufficient strength resisting pressure applied in the film thickness direction. A radiographic image conversion panel of the invention includes a support and a scintillator layer disposed on the support. The scintillator layer includes a plurality of columnar crystals containing a phosphor. The plurality of columnar crystals have root portions, and the root portions are spaced apart from one another.

Radiographic image conversion panel and radiographic image detector

A scintillator panel includes a scintillator layer that includes a phosphor including columnar crystals in which an X-ray rocking curve of a specific plane index measured by applying an X-ray to a columnar crystal growth ending surface after cutting to have a thickness of 5 &#x3bc;m from a columnar crystal growth starting surface has a half-width (a) of equal to or less than 15 degrees, an X-ray rocking curve of the specific plane index measured by applying an X-ray to the columnar crystal growth ending surface without cutting has a half-width (b) of equal to or less than 15 degrees, and a ratio (a/b) is within a range of from 0.5 to 2.0. The scintillator panel can provide radiation images having higher sharpness.

Scintillator panel and radiation detector

Disclosed is a radiation image conversion panel wherein luminance is improved by preventing the disorder of the structure of phosphor columnar crystals, thereby eliminating the scattering and refraction of optical elements which is emitted by an X-ray-irradiated phosphor and propagated in the direction of a photoelectric conversion element. Moreover disclosed is a radiation image detector using the same. The radiation image conversion panel is characterized in that the radiation image conversion panel comprises a phosphor layer on the substrate, that the phosphor layer is configured of the phosphor columnar crystals formed from a phosphor matrix compound and an activator by vapor deposition, and that the degree of the orientation of the surface of the phosphor columnar crystals, the degree of the orientation being based on X-ray diffraction spectrum and the surface having a fixed mirror index, is in the range of 80 to 100% without regard to the position in the direction of the thickness of the layer from the root near the substrate to the tip of the phosphor columnar crystals of the phosphor layer.

Radiation image conversion panel and radiation image detector using same

Disclosed is a radiation image conversion panel containing a support having thereon a phosphor layer containing an alkali metal halide phosphor which is deposited on the support by a gas phase accumulation method, wherein the alkali metal halide phosphor includes a columnar crystal and an existing ratio of an activation agent of the columnar crystal on a surface of the columnar crystal to an inner portion of the columnar crystal is from 0.7 to 20.

Disclosed is a radiation image conversion panel comprising on a support a vapor-deposited photostimulable phosphor layer containing an alkali metal halide phosphor, wherein the surface element composition of the alkali metal halide phosphor exhibits a ratio of alkali metal to halide of 1.0 to 1.5.

An object of the present invention is to provide a radiation image conversion panel exhibiting excellent sharpness, excellent graininess and high luminance, accompanied with high aging performance. Also disclosed is a radiation image conversion panel possessing an alkali metal halide based stimulable phosphor layer formed by a vapor deposition method, provided on a support, wherein a stimulable phosphor possesses at least two kinds of halides, and a phosphor columnar crystal in the stimulable phosphor layer has a core/shell structure.

A photothermographic imaging material packed in a packaging material, the imaging material including a support having thereon light-insensitive organic silver salt grains, photosensitive silver halide grains, a reducing agent for silver ions and a binder, wherein the packaging material has a water permeability of not less than 5.0 g/mmeasured at a temperature of 40&#xb0; C. with a relative humidity of 90% for 24 hours; and the imaging material has a first photographic speed and a second photographic speed and the second photographic speed is not more than 1/10 of the first photographic speed, the measuring methods of the first and the second photographic speeds being defined in the specification.

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Hachioji, Japan

Keiko Maeda