Appeal No. 1997-2937
Application No. 08/420,562
APPENDIX
1. 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:
A B Me X :xD3+
2-y 1+y 6
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
r > r , r representing the ionic radius ofA B A
monovalent metal ion A, r the ionic radius of monovalent
B
metal ion B
Me = a trivalent ion3+
D is a dopant
X is at least one of F, Cl, Br and I
O < y < 1
O < x < 0.2
and wherein said phosphor has a specific gravity (sg) > 4.
A1
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