Radiation image converting panel and production method of the same

• US 6,992,305 B2
• Filed: 04/28/2003
• Issued: 01/31/2006
• Est. Priority Date: 05/08/2002
• Status: Expired due to Fees

• Current Assignee: Konica Corporation (Konica Minolta Inc.)
• Original Assignee: Konica Corporation (Konica Minolta Inc.)
• Inventors: Mishina, Noriyuki, Maezawa, Akihiro
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): Sung, Christine
• Application Number:
  US10/424,418
• Publication Number:
  US 20030209675A1
• Time in Patent Office: 1,009 Days
• Field of Search: 250/484.4, 250/584, 427/65
• US Class Current: 250/484.4
• CPC Class Codes: C09K 11/7733 with alkali or alkaline earth metals
• CPC Class Codes: G03B 42/02 using X-rays
• CPC Class Codes: G21K 4/00 Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens photographic processes using X-ray intensifiers G03C5/17; discharge tubes comprising luminescent screens H01J1/62; cathode ray tubes for X-ray conversion with optical output H01J31/50

Abstract

A radiation image converging panel comprising a support having thereon a stimulable phosphor layer produced by a vapor phase method so as to have a thickness of 50 μm to 10 mm, wherein the stimulable phosphor layer comprises:(i) a stimulable phosphor; and (ii) an alkaline metal compound or an alkaline earth metal compound each having a different crystal structure from the stimulable phosphor, and an amount of the alkaline metal compound or the alkaline earth metal compound being 10 to 1000 ppm by weight based on the total weight of the stimulable phosphor layer.

Claims

1. A radiation image converting panel comprising a support having thereon a stimulable phosphor layer produced by a vapor phase method so as to have a thickness of 50 μ

m to 1 mm,

wherein the stimulable phosphor layer comprises a stimulable phosphor comprising at least two kinds of rare earth compounds each having a different rare earth element, and the rare earth compounds being uniformly present in the stimulable phosphor layer, and

wherein a photostimulated delayed luminance ratio defined by Eb/Ea is 0.0001 to 0.1%;

(i) Ea being a luminance of a photostimulated emission from the radiation image converting panel after being irradiated with X ray and subsequently being stimulated with a laser; and

(ii) Eb being a luminance of the stimulated delayed emission from the radiation image converting panel at 300 msec after suspension of stimulation with the laser.

2. A radiation image converting panel of claim 1 wherein the stimulable phosphor is represented by Formula (1):

M′

X·

aM²X′

₂·

bM³X″

₃;

eA  

 

Formula (1).

3. The radiation image converting panel of claim 1 wherein one of the two kinds of rare earth compounds comprises a Cs atom.

4. The radiation image converting panel of claim 1 wherein said stimulable phosphor is produced in a dry air condition to produce a protective layer on the stimulable phosphor layer.

5. A radiation image converting panel comprising a support having thereon a stimulable phosphor layer produced by a vapor phase method so as to have a thickness of 50 μ

m to 1 mm,

wherein the stimulable phosphor layer comprises a stimulable phosphor comprising at least two kinds of rare earth compounds each having a different rare earth element, and the rare earth compounds being uniformly present in the stimulable phosphor layer, and

wherein an instantaneous delayed luminance ratio defined by E1/E0 is 0.0001 to 0.1%;

(i) E0 being a luminance of an emission from the radiation image converting panel at the moment of being irradiated with X ray; and

(ii) E1 being a luminance of an emission from the radiation image converting panel at 300 msec after suspension of irradiation with X ray.

6. A radiation image converting panel of claim 5 wherein the stimulable phosphor is represented by Formula (1):

M′

X·

aM²X′

₂·

bM³X″

₃;

eA  

 

Formula (1).

7. The radiation image converting panel of claim 5 wherein one of the two kinds of rare earth compounds comprises a Cs atom.

8. The radiation image converting panel of claim 5 wherein said stimulable phosphor is produced in a dry air condition to produce a protective layer on the stimulable phosphor layer.