Class of high energy detecting phosphors
AssigneeAgfa-Gevaert
InventorsPaul Leblans, Peter Willems, Luc Struye, Johann-Martin Spaeth, Thomas Pawlik
Life of this patent
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Abstract
An elpasolite phosphor is provided corresponding to the general formula: A2−yB1+yMe3+X6:xD wherein: A=a monovalent ion B=a monovalent ion A is different from B Me3+=a trivalent ion D is a dopant X is at least one of F, Cl, Br and I 0≦y≦1 0≦x≦0.2 and wherein said phosphor has a specific gravity (sg)≧4. An elpasolite phosphor corresponding to the general formula above is especially useful in the production of prompt emitting X-ray screens and in the production of X-ray energy storage screens.
Claims15
A method for recording X-rays comprising the steps of
- i. exposing a recording element comprising an X-ray intensifying screen in combination with a photosensitive material to X-rays,
- ii. recording the light emitted by said X-ray intensifying screen in said photosensitive material, wherein said X-ray intensifying screen comprises an elpasolite phosphor corresponding to the general formula:
- A2−yB1+yMe3+X6:xD
- wherein:
- A is a monovalent metal ion selected from the group consisting of Cs, Rb, K and Tl ions,
- B is a monovalent metal ion selected from the group consisting of Rb, K and Na ions,
- A is different from B
- rA>rB, rA representing the ionic radius of monovalent metal ion A, rB the ionic radius of monovalent metal ion B
- Me3+=a trivalent ion
- D is a dopant
- X is at least one of F, Cl, Br and I
- 0≦y≦1
- 0≦x≦0.2
- and wherein said phosphor has a specific gravity (sg)≧4.
A method for recording X-rays comprising the steps of
- i. exposing a photostimulable storage phosphor screen,
- ii. storing the absorbed X-ray energy in said photostimulable phosphor screen,
- iii. stimulating said photostimulable phosphor screen with stimulating radiation to yield a stimulated light output,
- iv. reading said light output wherein said photostimulable phosphor screen comprises an elpasolite phosphor corresponding to the general formula:
- A2−yB1+yMe3+X6:xD
- wherein:
- A is a monovalent metal ion selected from the group consisting of Cs, Rb, K and Tl ions,
- B is a monovalent metal ion selected from the group consisting of Rb, K and Na ions,
- A is different from B
- rA>rB, rA representing the ionic radius of monovalent metal ion A, rB the ionic radius of monovalent metal ion B
- Me3+=a trivalent ion
- D is a dopant
- X is at least one of F, Cl, Br and I
- 0≦y≦1
- 0≦x≦0.2
- and wherein said phosphor has a specific gravity (sg)≧4.
Dependencies are inferred from the claim text.