Patent Number: 062947893
Section: claims

1. A radiation intensifying screen comprising: a first radiation absorbing, luminescent layer formed from a first luminescing material capable of producing a spectral emissions maximum at first predetermined wavelength in response to incident radiation;  a second radiation absorbing, luminescent layer formed from a second luminescing material capable of producing a spectral emissions maximum at a second predetermined wavelength which is different from the first predetermined wavelength range in response to incident radiation; and  means, disposed between the first and second luminescent layers, for reflecting incident spectral emissions emanating from the first luminescent layer at the first predetermined wavelength and for allowing spectral emissions emanating from the second luminescent layer at the second predetermined wavelength to pass therethrough.  a first radiation absorbing, luminescent layer formed from a first luminescing material capable of producing spectral emissions of varying wavelengths in a first wavelength range in response to incident radiation;  a second radiation absorbing, luminescent layer formed from a second luminescing material capable of producing spectral emissions of varying wavelengths in a second wavelength range which is greater than the first wavelength range in response to incident radiation; and  a reflective-transmissive layer disposed between the first and second luminescent layers, wherein the reflective-transmissive layer is adapted to reflect incident spectral emissions of varying wavelengths emanating from the first luminescent layer which are less than a cutoff wavelength of the reflective-transmissive layer, wherein the reflective-transmissive layer is also adapted to allow spectral emissions of varying wavelengths emanating from the second luminescent layer which are greater than the cutoff wavelength of the reflective-transmissive layer to pass therethrough.  a first radiation absorbing, luminescent layer formed from a first luminescing material capable of producing spectral emissions of varying wavelengths in a first wavelength range in response to incident radiation;  a second radiation absorbing, luminescent layer formed from a second luminescing material capable of producing spectral emissions of varying wavelengths in a second wavelength range, which is less than the first wavelength range, in response to incident radiation; and  a reflective-transmissive layer disposed between the first and second luminescent layers, wherein the reflective-transmissive layer is adapted to reflect incident spectral emissions of varying wavelengths emanating from the first luminescent layer which are greater than a cutoff wavelength of the reflective-transmissive layer, wherein the reflective-transmissive layer is also adapted to allow spectral emissions of varying wavelengths emanating from the second luminescent layer which are lower than the cutoff wavelength of the reflective-transmissive layer to pass therethrough. 2. The intensifying screen of claim 1, further comprising a backing layer disposed adjacent to the second luminescent layer. 3. The intensifying screen of claim 2, further comprising means, disposed between the second luminescent layer and the backing layer, for reflecting incident spectral emissions emanating from the second luminescent layer at the second predetermined wavelength. 4. The intensifying screen of claim 1, wherein the first predetermined wavelength is less than the second predetermined wavelength, and wherein the means disposed between the first and second luminescent layers is a long pass filter. 5. The intensifying screen of claim 1, wherein the first predetermined wavelength is greater than the second predetermined wavelength, and wherein the means disposed between the first and second luminescent layers is a short pass filter. 6. The intensifying screen of claim 1, further comprising a protective layer disposed over the first luminescent layer. 7. The intensifying screen of claim 1, further comprising a charge coupled device and means for optically coupling spectral emissions emanating from the first and second luminescent layers to the charge coupled device, wherein the coupling means is disposed between the charge coupled device and the first luminescent layer. 8. The intensifying screen of claim 7, wherein the means for optically coupling spectral emissions is a plurality of optical fibers. 9. A radiation intensifying screen comprising: 10. The intensifying screen of claim 9, further comprising a backing layer disposed adjacent to the second luminescent layer. 11. The intensifying screen of claim 10, further comprising a secondary reflective layer disposed between the second luminescent layer and the backing layer, wherein the secondary reflective layer is adapted to reflect spectral emissions of varying wavelengths emanating from the second luminescent layer. 12. The intensifying screen of claim 9, further comprising a protective layer disposed over the first luminescent layer. 13. The intensifying screen of claim 9, further comprising a charge coupled device imager and means for optically coupling spectral emissions emanating from the first and second luminescent layers to the charge coupled device, wherein the coupling means is disposed between the charge coupled device and the first luminescent layer. 14. The intensifying screen of claim 13, wherein the means for optically coupling spectral emissions is a plurality of optical fibers. 15. A radiation intensifying screen comprising: 16. The intensifying screen of claim 15, further comprising a backing layer disposed adjacent to the second luminescent layer. 17. The intensifying screen of claim 16, further comprising a secondary reflective layer disposed between the second luminescent layer and the backing layer, wherein the secondary reflective layer is adapted to reflect spectral emissions of varying wavelengths emanating from the second luminescent layer. 18. The intensifying screen of claim 15, further comprising a protective layer disposed over the first luminescent layer. 19. The intensifying screen of claim 15, further comprising a charge coupled device and means for optically coupling spectral emissions emanating from the first and second luminescent layers to the charge coupled device, wherein the coupling means is disposed between the charge coupled device and the first luminescent layer. 20. The intensifying screen of claim 19, wherein the means for optically coupling spectral emissions is a plurality of optical fibers.