Claims
- 1. A method of storing an image produced by x-ray exposure and releasing the stored image comprising:
- exposing an x-ray storage screen, comprised of an isotropic storage phosphor and a polymer coated on a support, to x-radiation of a first wavelength in an imagewise manner to store an image pattern in the storage screen,
- retrieving the image pattern from the storage screen by exposing the storage screen to radiation of a second wavelength, thereby stimulating radiation of a third wavelength,
- the polymer having an index of refraction which matches that of the phosphor at the second wavelength, and
- the support being non-reflective to radiation of the second wavelength.
- 2. A method of storing an image according to claim 1 wherein the index of refraction of the polymer does not match the index of refraction of the phosphor for radiation of the third wavelength.
- 3. A method of storing an image according to claim 1 wherein the index of refraction of the polymer differs by more than 0.02 from the index of refraction of the phosphor for radiation of the third wavelength.
- 4. A method of storing an image according to claim 1 wherein the support is reflective to radiation of the third wavelength.
- 5. A method of storing an image according to claim 1 wherein the support exhibits minimum reflectance to radiation of the second wavelength.
- 6. A method according to claim 1 wherein the phosphor and the polymer form a fluorescent composition comprising
- (a) from 50 to 90 percent by weight of the phosphor and
- (b) from 10 to 50 percent of the polymer.
- 7. A method according to claim 6 wherein the polymer comprises:
- (i) from 5 to 100 mole percent of a copolymerizable ethylenically unsaturated monomer; and
- (ii) from 0 to 95 mole percent of recurring units having the formula ##STR7## wherein: Ar is arylene;
- R.sup.1 is H or alkyl;
- R.sup.2 is H, alkyl, aryl, or aralkyl; and
- R.sup.4 is H, alkyl, alkoxy, amino, halogen, sulfide, sulfoxide, sulfonate or heterocyclic.
- 8. A method according to claim 6 wherein the polymer comprises:
- (i) from 5 to 100 mole percent of recurring units having the formula: ##STR8## wherein: R.sup.1 is H or alkyl; and
- R.sup.2 is alkyl, cycloalkyl, aryl, aralkyl or aryl substituted with alkyl, alkoxy or heterocyclic; and
- (ii) from 0 to 95 mole percent of recurring units having the formula: ##STR9## wherein: Ar is arylene;
- R.sup.3 is H, alkyl, aryl, or aralkyl; and
- R.sup.4 is H, alkyl, alkoxy, amino, halogen, sulfide, sulfoxide, sulfonate or heterocyclic.
- 9. A method according to claim 6 wherein the polymer comprises:
- (i) from 5 to 99 mole percent of recurring units having the formula: ##STR10## wherein: R.sup.1 is H or alkyl; and
- R.sup.2 is alkyl, cycloalkyl, aryl, aralkyl or aryl substituted with alkyl, alkoxy, or heterocyclic; and
- (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR11## wherein Ar is arylene;
- R.sup.1 is H or alkyl;
- R.sup.3 is H, alkyl, aryl, or aralkyl and
- R.sup.4 is H, alkyl, alkoxy, amino, halogen, sulfide, sulfoxide, sulfonate or heterocyclic.
- 10. An x-ray storage screen comprising:
- (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and
- (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and
- (c) said support being non-reflective to radiation of the second wavelength,
- said phosphor and said polymer forming a fluorescent composition comprising
- (a) from 50 to 90 percent by weight of said phosphor and
- (b) from 10 to 50 percent by weight of said polymer, and
- said polymer comprising:
- (i) from 5 to 99 mole percent of recurring units having the formula: ##STR12## (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR13##
- 11. An x-ray storage screen comprising:
- (a) a substantially isotropic storage phosphor, said phoshor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and
- (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and
- (c) said support being non-reflective to radiation of the second wavelength,
- said phosphor and said polymer forming a fluorescent composition comprising
- (a) from 50 to 90 percent by weight of said phosphor and
- (b) from 10 to 50 percent by weight of said polymer, and
- said polymer comprising:
- (i) from 5 to 100 mole percent of a copolymerizable naphthyl carbinyl methacrylate monomer; and
- (ii) from 0 to 95 mole percent of a copolymerizable naphthyl carbinyl thioacrylate monomer.
- 12. An x-ray storage screen comprising:
- (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and
- (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and
- (c) said support being non-reflective to radiation of the second wavelength,
- said phosphor and said polymer forming a fluorescent composition comprising
- (a) from 50 to 90 percent by weight of said phosphor and
- (b) from 10 to 50 percent by weight of said polymer, and
- said polymer comprising
- (i) from 5 to 99 mole percent of a copolymerizable naphthyl carbinyl methacrylate monomer; and
- (ii) from 1 to 95 mole percent of a copolymerizable naphthyl carbinyl thioacrylate monomer.
- 13. An x-ray storage screen comprising:
- (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and
- (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and
- (c) said support being non-reflective to radiation of the second wavelength,
- said phosphor and said polymer forming a fluorescent composition comprising
- (a) from 50 to 90 percent by weight of said phosphor and
- (b) from 10 to 50 percent by weight of said polymer, and
- said polymer comprising:
- (i) from 5 to 100 mole percent of polymerized 1-naphthyl carbinyl methacrylate monomer; and
- (ii) from 0 to 95 mole percent of polymerized S-(1-naphthyl carbinyl)thioacrylate monomer.
- 14. An x-ray storage screen according to claim 16 wherein said fluorescent composition is coated on a black anodized aluminum surface of said support.
Parent Case Info
This is a division of copending commonly assigned Ser. No. 721,130, filed Apr. 8, 1985, now U.S. Pat. No. 4,637,898 which is a continuaton of U.S. Ser. No. 238,404, filed Feb. 26, 1981, now abandoned.
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Divisions (1)
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Date |
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Parent |
721130 |
Apr 1985 |
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Continuations (1)
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238404 |
Feb 1981 |
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