Precursor of halide-type photostimulable phosphor, halide-type photostimulable phosphor, radiation image conversion panel, and process for producing them

A technology for radiographic images and manufacturing methods, applied in chemical instruments and methods, calcium/strontium/barium halide, conversion screens, etc., can solve problems such as non-optimization, and achieve good productivity, good clarity, and uniform particle size distribution. Effect

Inactive Publication Date: 2008-07-09
KONICA MINOLTA MEDICAL & GRAPHICS INC
View PDF47 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at the beginning of the concentration, due to the abundant presence of BaF as an interme

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0142] The preparation of the coating solution for the luminescent phosphor layer is carried out using a dispersion device as described below. Kady grinder or ultrasonic disperser, etc.

[0143] A coating film is formed by uniformly coating the coating solution for a bright phosphor layer prepared as described above on the surface of a support to be described later. As the coating method that can be used, a common coating method such as a doctor blade method, a roll coating method, a blade coating method, a spot coating method, a lip coating method, etc. can be used.

[0144] Then, the coating film formed by the above method is heated and dried to complete the formation of the bright phosphor layer on the support. The film thickness of the bright phosphor layer varies depending on the characteristics of the intended radiographic image conversion plate, the type of bright phosphor, the mixing ratio of the binder and the phosphor, etc., but is usually 10 to 1000 μm or more. Pr...

Embodiment 1

[0217] (Process 1)

[0218] In order to synthesize the luminescent phosphor precursors of europium-activated barium iodide fluoride, the BaI 2 Aqueous solution (3.5N) 2500ml and EuI 3 80 ml of aqueous solution (0.1 N) was charged into the reactor. The reaction mother liquid in the reactor was kept at 83° C. while stirring. Use a roller pump to pump NH 4 250ml of F aqueous solution (8N) was injected into the reaction mother liquor to generate a precipitate. After the injection was completed, the heat preservation and stirring were continued for 2 hours to ripen the precipitate. Next, the precipitate was filtered, washed with methanol, and vacuum-dried to obtain crystals of europium-activated barium iodide fluoride (BaFI: 0.004Eu).

[0219] Next, put the above-mentioned brilliant phosphor precursor crystal particles (BFI powder) into a mixed solution of ethanol and 46% HBr aqueous solution at a ratio of 98.5:1.5, stir for 15 minutes, filter, and wash to obtain the crystal s...

Embodiment 2

[0228] (Process 2)

[0229] In order to synthesize the luminescent phosphor precursors of europium-activated barium iodide fluoride, the BaI 2 Aqueous solution (3.5N) 2500ml and EuI 3 80ml of aqueous solution (0.1N) was charged into the reactor. The reaction mother liquid in the reactor was kept at 83° C. while stirring. Use a roller pump to pump NH 4 250ml of F aqueous solution (8N) was injected into the reaction mother liquor to generate a precipitate. After the injection was completed, the heat preservation and stirring were continued for 2 hours to ripen the precipitate. Next, the precipitate was filtered, washed with methanol, and vacuum-dried to obtain crystals of europium-activated barium iodide fluoride (BaFI: 0.004Eu). In order to prevent the change of particle shape caused by sintering and the change of particle size distribution caused by welding between particles during firing, 1% by mass of ultrafine powder of alumina is added and fully stirred with a mixer t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Average glass transition temperatureaaaaaaaaaa
Login to view more

Abstract

This invention relates to a halide-type photostimulable phosphor having improved moisture resistance and brightness, and a process for producing the same. The halide-type photostimulable phosphor is characterized in that, among elements constituting the outermost surface and inside of the phosphor, there is a difference in composition ratio of a halogen element between the outermost surface and the inside of the phosphor. A radiation image conversion panel, which has been improved, for example, in moisture resistance, brightness and image quality by using the phosphor, and a process for producing the same are also provided.

Description

technical field [0001] The present invention relates to a halide-based bright phosphor, and more particularly to a rare-earth-activated alkaline earth metal fluoride-bromide-based bright phosphor, a method for producing the same, and a radiographic image conversion panel using the bright phosphor. Background technique [0002] As one of the image forming methods replacing the conventional radiography method, there is known a radiographic image recording and reproducing method using a bright phosphor (refer to Patent Document 1). This method uses a radiation image conversion plate (also called a storage phosphor sheet) containing an exhaustive phosphor, so that the radiation transmitted through the subject or emitted from the object to be detected can be absorbed into the exhaustive phosphor. , using electromagnetic waves such as visible light and ultraviolet rays (called "excitation light") to excite the exhaustive phosphor in time series, so that the stored radiation energy...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K11/61C09K11/00C09K11/08G01T1/00G21K4/00C01F11/20
Inventor 前泽明弘本田哲若松秀明锅田博之
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap