Phosphor composition and X-ray intensifying screen capable of emitting principally in the spectral region of native silver halide sensitivity
AssigneeEastman Kodak Company
InventorsPatrick M. Lambert, Philip S. Bryan, Gregory S. Jarrold, Christine M. Towers
Life of this patent
Estimating the term…
Abstract
A phosphor composition is disclosed containing a titanium activated hafnium zirconium germanate phosphor which emits electromagnetic radiation principally in the spectral region to which silver halide exhibits native sensitivity. To maximize the intensity of emission the ratio of host metals satisfies the relationship: D.sub.1+x Ge.sub.1-x where D is the combined sum of zirconium and halnium and x is 0.25 to -0.70. An X-ray intensifying screen is disclosed containing the phosphor composition.
Claims24
An intensifying screen comprised of
- a support and
- a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting electromagnetic radiation principally in the spectral region to which silver halide exhibits native sensitivity,
- characterized in that the phosphor is titanium activated hafnium zirconium germanate in which hafnium, zirconium and germanium satisfy the relationship:
- D.sub.1+x Ge.sub.1-x
- where
- D is the combined sum of zirconium and hafnium and
- x is 0.25 to -0.70.
An intensifying screen comprised of
- a support and
- a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting electromagnetic radiation principally in the 300 to 500 nm region of the spectrum, characterized in that the phosphor consists essentially of oxygen and metals satisfying the relationship:
- [(Hf.sub.1-z Zr.sub.z).sub.1+x Ge.sub.1-x ].sub.1-y Ti.sub.2y
- where
- x is 0.25 to -0.70;
- 2y is 5.times.10.sup.-4 to 0.15;
- and
- z is at least 4.times.10.sup.-4.
An intensifying screen according to claim, 2 further characterized in that x is up to 0.20.
A phosphor composition comprised of titanium activated hafnium zirconium germanate in which hafnium, zirconium and germanium satisfy the relationship:
- D.sub.1+x Ge.sub.1-x
- where
- D is the combined sum of zirconium and hafnium and
- x is 0.25 to -0.70.
Dependencies are inferred from the claim text.