Fuji Photo Film Company, Limited

Fujifilm Corporation

Yuji Isoda

Hiroshi Matsumoto

Kenji Takahashi

Katsuhiro Kohda

Satoshi Arakawa

Ichirou Miyagawa

Yasuo Iwabuchi

Sumihiro Nishihata

Seiji Tazaki

Chiyuki Umemoto

Makoto Funabashi

Takashi Nakamura

Yuichi Hosoi

Kiyoteru Miyake

Atsunori Takasu

Keiko Neriishi

The radiation image conversion panel includes a phosphor layer formed by a vapor-phase deposition and solely formed of columnar crystals, a matrix layer formed under the phosphor layer, is substantially free of an activator of a phosphor, and has a columnar crystal region and an underlying non-columnar crystal region and a substrate which supports the matrix layer and the phosphor layer formed on the matrix layer. The process for producing the radiation image conversion panel forms on the substrate the matrix layer and forms the phosphor layer by the vapor-phase deposition. The formation of the phosphor layer is started after a crystal structure of an upper region of the matrix layer has changed from a non-columnar to a columnar.

Radiation image conversion panel and process for producing the same

The radiation image conversion panel includes a substrate and a phosphor layer of columnar crystals formed on the substrate by vapor-phase deposition, with a column diameter distribution of the columnar crystals having two or more peaks. The process for producing a radiation image conversion panel prepares a substrate on which two or more types of projections different in diameter are formed and satisfies Expression '0.4R&#x2266;r&#x2266;0.8R' where R is a diameter of a largest projection and r is a diameter of any one of the remainder in the two or more types of projections, thereby making a surface of the substrate uneven and forms a phosphor layer on the uneven surface of the substrate by vapor-phase deposition.

In a radiation image storage panel having a support, an underlayer, and a phosphor layer of a phosphor composed of a matrix compound and an activator and is formed on the underlayer by a gas phase-accumulation method, the underlayer consists essentially of the matrix compound and has a relative density lower than a relative density of the phosphor layer.

Radiation image storage panel

A phosphor panel favorably employable for medical diagnosis of chest has a phosphor layer formed on a substrate by a gas phase-accumulation method, in which the phosphor layer is composed of a large number of phosphor columns standing parallel to each other, in which the phosphor columns have a mean diameter of 0.1 to 50 &#x3bc;m at a top surface thereof, and there are no phosphor columns having a diameter larger than 200 &#x3bc;m at the top surface.

Phosphor panel

A radiation image storage panel having a phosphor layer formed by a gas phase-accumulation method, in which wherein the phosphor layer is composed of an alkali metal halide stimulable phosphor activated by an activator, and the crystal lattice in the phosphor layer has a lattice distortion in the range of 0.035 to 0.30%.

A radiation image storage panel has a phosphor layer composed of a phosphor matrix compound and an activator in combination, a subbing layer composed of the phosphor matrix compound, and a support, in which both of the subbing layer and phosphor layer have been formed by a gas phase-accumulation method and in which the subbing layer has a relative density of 60% to 98%, and a surface of the support in contact with the subbing layer shows a contact angle of less than 50&#xb0; to water.

A radiation image storage panel has a phosphor layer formed by a gas phase-accumulation method, in which the phosphor layer is composed of a lower sub-layer of a spherical crystal structure and an upper sub-layer of a columnar crystal structure.

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&#x3c;(400&#x2013;420)&#x3c;0.20in which S(400&#x2013;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.

A stimulable phosphor sheet is prepared by applying an electron beam to a stimulable phosphor or its source in a vacuum to vaporize a phosphor or its source and depositing the vaporized phosphor or source on the support, under the condition that the electron beam is applied to the stimulable phosphor or source at an accelerating voltage of 1.5 kV to 5.0 kV. The stimulable phosphor or its source is preferably in the form of a solid having a relative density of 80% to 98%.

Preparation of stimulable phosphor sheet

A radio-conductive material which exhibits conductivity upon exposure to radiations is formed of alcohol-soluble nylon and inorganic material having radiation absorbing power.

Radio-conductive material, method of manufacturing the same, solid sensor using the same, method of manufacturing radio-conductive film, and radiation image read-out apparatus

An europium activated cesium bromide phosphor having the formula of CsBr:xEu [0&#x3c;x&#x2266;0.2], in which a relationship between an emission intensity (I) of Euand a coloring intensity (I) at F(Br) center satisfies the condition of 0.2&#x2266;I&#xd7;I, and/or in which a ratio of Euto Eucontained in the phosphor in terms of emission intensity satisfies the condition of 5&#xd7;10&#x2266;Eu/Eu&#x2266;0.1 gives an increased stimulated emission amount and is favorably employed for producing a radiation image storage sheet.

Europium activated cesium bromide phosphor and radiation image storage sheet

A radiation image storage panel composed of a substrate and a phosphor film of a stimulable phosphor which is composed of a mother component and an activator element and is formed by vapor deposition, is preferred to have a relationship of a molar ratio of activator element/mother component in an optionally determined one position on the phosphor film and a molar ratio of activator element/mother component in an optionally determined different position on the phosphor film satisfies the condition of 0.1&#x2266;Ra/Rb&#x2266;10 [Ra means a molar ratio of activator element/mother component in an optionally determined one position of the phosphor film and Rb means a molar ratio of activator element/mother component in an optionally determined different position of the phosphor film].

A radiation image storage panel composed of a support and a phosphor film of a stimulable europium activated cesium bromide phosphor having the formula (I):CsBr.MX&#x2212;aMX'+bMX&#x2033;:zEu &#x2003;&#x2003;(I)[Mis an alkali metal element; Mis an alkaline earth metal element or a divalent metal element; Mis a rare earth element or a trivalent metal element; each of X, X&#x2032; and X&#x2033; is a halogen; and 0&#x2266;a&#x3c;0.5, 0&#x2266;b&#x3c;0.5, 0&#x2266;c&#x3c;0.5, and 0&#x3c;z&#x3c;1.0] is prepared by the steps of depositing on the support a prismatic europium activated cesium bromide phosphor crystal layer on the support in a gas phase; and heating the crystal layer at a temperature of &#x3c;300 &#xb0; C. but &#x3e;50&#xb0; C. for 1 to 8 hours in an inert gas atmosphere which may contain a small amount of oxygen or hydrogen.

Process for preparing radiation image storage panel by gas phase deposition

Stimulating rays produced by a line light source are linearly irradiated onto an area of a stimulable phosphor sheet, on which a radiation image has been stored, the stimulating rays causing the sheet to emit light in proportion to an amount of energy stored thereon during its exposure to radiation. Light emitted from the exposed linear area of the sheet is received with a line sensor comprising photoelectric conversion devices arrayed along each of a length direction of the linear area of the stimulable phosphor sheet and a direction normal to the length direction. The sheet is moved with respect to the line light source and the line sensor and in a direction different from the length direction of the linear area of the sheet. Operation processing is performed on outputs of the photoelectric conversion devices, which outputs have been obtained at respective positions of movement and correspond to an identical site on the sheet.

Growing community of inventors

Kanagawa, Japan

Yuji Isoda