X-ray intensifying screen with enhanced emission
AssigneeEastman Kodak Company
InventorsPhilip S. Bryan, Patrick M. Lambert, Christine M. Towers, Gregory S. Jarrold
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Abstract
An intensifying screen for producing a latent image in a silver halide radiographic element upon exposure to an image pattern of X-radiation is disclosed. The intensifying screen contains a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation comprised of monoclinic crystals of a titanium activated zirconium hafnium oxide phosphor host. The phosphor contains in an amount sufficient to enhance emission of the longer wavelength electromagnetic radiation at least one alkali metal in combination with at least one Group 14 dopant chosen from Periods 3, 4 and 5.
Claims30
An intensifying screen comprised of
- a support and
- a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation comprised of monoclinic crystals of a titanium activated zirconium hafnium oxide phosphor host,
- characterized in that the monoclinic crystals consist essentially of oxygen and combined elements satisfying the relationship:
- Hf.sub.1-z Zr.sub.z M.sub.y Ti.sub.x E.sub.e
- where
- E represents at least one of germanium and silicon:
- e is in the range of from greater than 1.times.10.sup.-3 to 0.1;
- M represents at least one alkali metal;
- x is in the range of from 3.times.10.sup.-4 to 1.0;
- y is in the range of from 1.times.10.sup.-4 to 1.0;
- and
- z is in the range of from 4.times.10.sup.-4 to 0.3.
An intensifying screen comprised of
- a support and
- a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation comprised of monoclinic crystals of a titanium activated zirconium hafnium oxide host,
- characterized in that the monoclinic crystals consist essentially of oxygen and combined elements satisfying the relationship:
- Hf.sub.1-z Zr.sub.z M.sub.y Ti.sub.x G.sub.v E.sub.e
- where
- E represents at least one of germanium and silicon;
- e is in the range of from greater than 1.times.10.sup.-3 to 0.1;
- G represents a metal selected from the class consisting of scandium and indium;
- M represents at least one alkali metal;
- v is in the range of from 1.times.10.sup.-6 to 1.times.10.sup.-2 ;
- x is in the range of from 3.times.10.sup.-4 to 1.0;
- y is in the range of from 1.times.10.sup.-4 to 1.0;
- and
- z is in the range of from 4.times.10.sup.-4 to 0.3.
An intensifying screen comprised of
- a support and
- a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation comprised of monoclinic crystals of a titanium activated zirconium hafnium oxide host,
- characterized in that the monoclinic crystals consist essentially of oxygen and elements that satisfy the relationship
- Hf.sub.1-z Zr.sub.z M.sub.y Ti.sub.x L.sub.w G.sub.v E.sub.e
- wherein
- E represents at least one of germanium and silicon;
- e is in the range of from greater than 1.times.10.sup.-3 to 0.1;
- G represents at least one indium and scandium;
- v is in the range of from 0 to 1.times.10.sup.-2 ;
- L represents a rare earth selected from among those have an atomic number of 39, 60, 62 to 64 inclusive, and 67 to 71 inclusive;
- w is in the range of from 0 to 1.times.10.sup.-2 ;
- M represents at least one alkali metal;
- y is in the range of from 1.times.10.sup.-4 to 0.3;
- x is in the range of from 3.times.10.sup.-4 to 1.0;
- and
- z is in the range of from 4.times.10.sup.-4 to 0.3.
An intensifying screen comprised of
- a support and
- a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation comprised of monoclinic crystals of a titanium activated zirconium hafnium phosphor oxide host,
- characterized in that the monoclinic crystals consist essentially of oxygen and elements that satisfy the relationship
- Hf.sub.1-z Zr.sub.z M.sub.y Ti.sub.x Nd.sub.w' In.sub.v E.sub.e
- wherein
- E represents at least one of germanium and silicon;
- e is in the range of from greater than 1.times.10.sup.-3 to 0.1;
- v is in the range of from 0 to 5.times.10.sup.-3 ;
- w' is in the range of from 0 to 5.times.10.sup.-4 ;
- M represents at least one alkali metal;
- y is in the range of from 6.times.10.sup.-4 to 0.3;
- x is in the range of from 3.times.10.sup.-4 to 1.0;
- and
- z is in the range of from 4.times.10.sup.-4 to 0.3.
Dependencies are inferred from the claim text.