Abstract: A phosphor powder for producing a high resolution phosphor screen and a phosphor screen are provided. The phosphor screen comprises a substrate, an infrared-absorbing layer, and a phosphor layer coated on the infrared-absorbing layer, wherein the phosphor layer comprises a phosphor powder in which a substantial amount of particles in the powder have a particle size as measured in the longest dimension of greater than 0 and less than about 5 microns. The phosphor screen may also comprise a black, infrared-absorbing substrate with the phosphor layer coated on the substrate. The phosphor powder is formed by preparing a phosphor composition, sintering the composition to form ingots, grinding the ingots to form a powder wherein a substantial amount of particles in the powder have a particle size of greater than 0 and less than about 5 microns, reactivating the powder in an inert atmosphere to a temperature of from about 500° C. to about 550° C.

Abstract: Making a phosphor screen by forming a phosphor powder that incorporates strontium, is made up of particles having a long dimension of less than about 5 microns and having superior response time. Slurrying the phosphor powder with a suitable solvent, dispersant, plasticizer and binder. Coating a suitable substate with an infra red absorbing layer. Coating the phosphor containing slurry onto the infra red absorbing layer. Drying the thus produced screen.

Abstract: Methods and apparatus for rapidly removing stored energy from (i.e., erasing) a reusable photostimulable storage phosphor screen use a first source of electromagnetic radiation which primarily outputs a wavelength or wavelengths of about 577 nanometers to about 597 nanometers, and a second source of electromagnetic radiation which primarily outputs a wavelength or wavelengths in the infrared region. Exposure to the second source of radiation may occur either after, or simultaneously with, exposure to the first source of radiation. During exposure to the first source of electromagnetic energy, ultraviolet radiation is filtered out so that none reaches the phosphor screen, or a first source is selected which does not output substantially any ultraviolet radiation. The first source of electromagnetic radiation erases the phosphor screen to a homogenized quasi-erased state.

Abstract: A phosphor powder for producing a high resolution phosphor screen and a phosphor screen are provided. The phosphor screen comprises a substrate, an infrared-absorbing layer, and a phosphor layer coated on the infrared-absorbing layer, wherein the phosphor layer comprises a phosphor powder in which a substantial amount of particles in the powder have a particle size as measured in the longest dimension of greater than 0 and less than about 5 microns. The phosphor screen may also comprise a black, infrared-absorbing substrate with the phosphor layer coated on the substrate. The phosphor powder is formed by preparing a phosphor composition, sintering the composition to form ingots, grinding the ingots to form a powder wherein a substantial amount of particles in the powder have a particle size of greater than 0 and less than about 5 microns, reactivating the powder in an inert atmosphere to a temperature of from about 500.degree. C. to about 550.degree. C.

Abstract: A phosphor powder for producing a high resolution phosphor screen and a phosphor screen are provided. The phosphor screen comprises a substrate, an infrared-absorbing layer, and a phosphor layer coated on the infrared-absorbing layer, wherein the phosphor layer comprises a phosphor powder in which a substantial amount of particles in the powder have a particle size as measured in the longest dimension of greater than 0 and less than about 5 microns. The phosphor screen may also comprise a black, infrared-absorbing substrate with the phosphor layer coated on the substrate. The phosphor powder is formed by preparing a phosphor composition, sintering the composition to form ingots, grinding the ingots to form a powder wherein a substantial amount of particles in the powder have a particle size of greater than 0 and less than about 5 microns, reactivating the powder in an inert atmosphere to a temperature of from about 500.degree. C. to about 550.degree. C.

Abstract: An opaque, generally flat flexible cassette is provided which receives and holds a storage phosphor screen while the screen is radiographed. The cassette has sufficient flexibility to be wrapped around an object to be radiographed. The cassette has a light-tight sealing device at or near its open end. The sealing device allows the cassette to be placed in either an open position for receiving or discharging the storage phosphor screen, or a closed position for holding the imaging storage medium therein during radiographing and transport. The cassette is designed so that the storage phosphor screen is discharged from the cassette without being physically handled by a person or being exposed to ambient light.

Abstract: A high resolution photostimulable storage phosphor screen for breast imaging using X-rays. The phosphor material for storing the image, SrS;Ce,Sm, is appropriately milled to a fine powder and dispersed, using appropriate methods, with high particle packing density, on a supporting substrate. The coated substrate froms a planar imaging screen for mammography. The phosphor screen of the present invention can record high quality digital (as opposed to analog) images for diagnostic breast imaging.

Abstract: A fiber optic dosimeter in which an electron trapping material is held in a probe on the tip of an optical fiber. The probe is placed in a region with the radiation to be measured, and the opposite end of the optical fiber, from which radiation readings are measured, is placed in a location remote from the radiation source. When radiation impinges upon the electron trapping material, electrons in the material are raised to a higher state where they are trapped and stay indefinitely. When infrared light strikes the material, the stored electrons are released from their traps and, upon falling to a lower energy level, emit visible light which can be detected and measured. Thus, to measure the amount of ambient radiation, the electron trapping material is stimulated with infrared light from an infrared source at the opposite end of the optical fiber.

Abstract: An article, having particular use as a scintillator, includes a thin film of calcium sulfide on a substrate, such as alumina, quartz, sapphire, or most glasses. The material is first formed in bulk with cerium sulfide, cerium oxide, or cerium, and lithium fluoride. The material is applied by physical vapor deposition in a relatively thin film to the substrate, and then at least the luminescent material is subjected to a high temperature for a period of time to effect recrystallization and activation of the material, such that the material acquires luminescent characteristics.

Abstract: In a preferred embodiment, a radioluminescent lamp having a glass face plate with a plurality of parallel planar light guides, each preferably having a transparent glass, sapphire or quartz base member, disposed perpendicularly with respect to the glass face plate and coated on both sides with a thin film of radioluminescent phosphor material. The plates are mounted in a sealed envelope filled with tritium gas, the radioactive decay of the tritium causing the phosphor to luminesce. The phosphor material and all but one of the edges of each light guide are overcoated with a reflective material, such as aluminum, to guide the generated light to a single edge of the light guide, which edge is adjacent the glass face plate. The phosphor is preferably a calcium sulfide-based material forming a continuous, binder-free layer on the transparent base member.