Binderless storage phosphor screen having fluoro-containing moieties

1. A binderless stimulable phosphor screen comprising a vapour deposited phosphor layer on a support and a radiation cured polymeric protective layer, characterized in that said protective layer comprises at least 1% (mol/mol) of moieties carrying fluor-atoms and polymeric beads incorporating fluorinated moieties with a volume median diameter, dv50, such that 5 μm<=dv50<=25 μm and a numeric median diameter, dn50, such that 1<=dv50/dn50<=1.20.

2. A binderless stimulable phosphor screen according to claim 1 , wherein said protective layer comprises between 5% mol/mol and 50% mol/mol, both limits included of moieties carrying fluor-atoms.

3. A binderless stimulable phosphor screen according to claim 1 , wherein said protective layer has a thickness, t, so that 1 μm≦t≦10 μm and said polymeric beads have a volume median diameter, d v50 , so that 1.25≦d v50 /t≦4.0.

4. A binderless stimulable phosphor screen according to claim 2 , wherein said protective layer has a thickness, t, so that 1 μm≦t≦10 μm and said polymeric beads have a volume median diameter, d v50 , so that 1.25≦d v50 /t≦4.0.

5. A binderless stimulable phosphor screen according to claim 1 , wherein said phosphor layer comprises an alkali metal phosphor.

6. A binderless stimulable phosphor screen according to claim 2 , wherein said phosphor layer comprises an alkali metal phosphor.

7. A binderless stimulable phosphor screen according to claim 5 , wherein said alkali metal phosphor is a CsX:Eu stimulable phosphor, wherein X represents a halide selected from the group consisting of Br and Cl.

8. A binderless stimulable phosphor screen according to claim 6 , wherein said alkali metal phosphor is a CsX:Eu stimulable phosphor, wherein X represents a halide selected from the group consisting of Br and Cl.

9. A binderless stimulable phosphor screen according to claim 7 , wherein said CsX:Eu stimulable phosphor is prepared by a method comprising the steps of:

mixing said CsX with between 10 −3 and 5 mol % of an Europium compound selected from the group consisting of EuX′ 2 , EuX′ 3 and EuOX′, X′ being a member selected from the group consisting of F, Cl, Br and I,

firing said mixture at a temperature above 450° C.

cooling said mixture and

recovering the CsX:Eu phosphor.

10. A binderless stimulable phosphor screen according to claim 8 , wherein said CsX:Eu stimulable phosphor is prepared by a method comprising the steps of:

mixing said CsX with between 10 −3 and 5 mol % of an Europium compound selected from the group consisting of EuX′ 2 , EuX′ 3 and EuOX′, X′ being a member selected from the group consisting of F, Cl, Br and I,

firing said mixture at a temperature above 450° C.

cooling said mixture and

recovering the CsX:Eu phosphor.

11. A binderless stimulable phosphor screen comprising a vapour deposited phosphor layer on a support and a radiation cured polymeric protective layer, characterized in that said protective layer comprises at least 1% (mol/mol) of moieties carrying fluor-atoms wherein said vapour deposited phosphor is needle shaped and said phosphor needles have a length, L and voids between them and wherein said protective layer fills said void for at most 0.10 times L.

12. A binderless stimulable phosphor screen comprising a vapour deposited phosphor layer on a support and a radiation cured polymeric protective layer, characterized in that said protective layer comprises at least 1% (mol/mol) of moieties carrying fluor-atoms wherein said protective layer comprises between 5% mol/mol and 50% mol/mol, both limits included of moieties carrying fluor-atoms wherein said vapour deposited phosphor is needle shaped and said phosphor needles have a length, L and voids between them and wherein said protective layer fills said void for at most 0.10 times L.