Abstract: An X-ray intensifying screen comprises a support and a layer containing a direct emission phosphor formed without a binder. The preferred direct emission phosphor is a rare earth silicate phosphor. Said X-ray intensifying screen is useful in the methods for recording and reproducing high energy radiation images. A process for the preparation of the binderless phosphor layer by reactive spray pyrolysis is also disclosed.

Abstract: The present invention relates to new phosphors for use in panels, apparatus and methods for recording and reproducing a high energy radiation image, including the steps of stimulating a phosphor image-wise exposed to radiation and detecting the fluorescent light emitted by said phosphor upon stimulation, said phosphor being a green emitting terbium activated alkali metal tantalate, doped with at least one element selected in the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, transition elements and lanthanides.

Abstract: The present invention relates to new phosphors for use in panels, apparatus and methods for recording and reproducing a high energy radiation image, including the steps of stimulating a phosphor image-wise exposed to radiation and detecting the fluorescent light emitted by said phosphor upon stimulation, said phosphor being a UV-blue-emitting trivalent cerium activated rare earth metal halo-silicate, optionally co-activated with one or more co-activators selected from the group consisting of Tb, Zr and Sm.

Abstract: A method for recording and reproducing a radiation image comprising the steps of (i) causing a phosphor, which can be stimulated with visible or infrared radiations, to absorb a high energy radiation passing through an object, (ii) stimulating phosphor with visible or infrared radiations to release the energy stored as fluorescent light, and (iii) detecting fluorescent light with light detecting means, wherein the photostimulable phosphor is selected from the group consisting of green-emitting trivalent erbium activated barium ytterbium halides, trivalent erbium activated barium fluorohalides and solid solutions thereof, optionally comprising an alkali metal halide. Apparatus for recording and reproducing a radiation image using the above described method. Radiation image storage panel containing the above described photostimulable phosphors.

Abstract: Europium activated magnesium oxide phosphors are described as useful photoluminescent materials, to be used in methods for detecting the presence or determining the concentration of carbon dioxide in a sample, comprising the steps of a) exposing to a predetermined wavelength range radiation a carbon dioxide-quenchable photoluminescent phosphor put in contact with the sample to cause the phosphor to store energy radiation, b) stimulating the photoluminescent phosphor with infrared radiation to release the stored energy as photoluminescent light, c) detecting and measuring the intensity of said photoluminescent light and d) correlating the measured intensity with an intensity of the photoluminescent light previously measured at a given reference carbon dioxide pressure value.

Abstract: A method for recording and reproducing a radiation image comprising the steps of (i) causing a visible radiation stimulable phosphor to absorb a high-energy radiation passing through an object, (ii) stimulating said phosphor with visible radiation to release the stored energy as fluorescent light and (iii) detecting said fluorescent light with light detecting means, is characterized by the fact that the photostimulable phosphor is selected within the group of divalent europium activated alkali earth metal halosilicates.Apparatus for recording and reproducing a radiation image using the above described method.Panel for storing a radiation image containing the above described photostimulable phosphors.Phosphors selected within the group of alkali earth metal halosilicates activated with divalent europium in the presence of Al and/or Ga and/or Na and/or K.

Abstract: A method for recording and reproducing a radiation image comprising the steps of (i) causing a visible or infrared radiation stimulable phosphor to absorb a high-energy radiation passing through an object, (ii) stimulating said phosphor with visible or infrared radiation to release the stored energy as fluorescent light and (iii) detecting said fluoroescent light with light detecting means, is characterized by the fact that the photostimulable phosphor is selected within the group of rare earth orthosilicates activated with a first activator comprising cerium and/or terbium and a second activator comprising zirconium and/or samarium, wherein rare earth is one of (a) yttrium, (b) yttrium and lutetium and (c) yttrium, lutetium and gadolinium.Panel for storing a radiation image containing the above described photostimulable phosphors.

Abstract: Phosphors constituted by terbium and/or cerium activated lutetium-gadolinium-yttrium silicates have shown a high visible-light emission efficiency upon exposure to high energy radiation.Said phosphors are useful in the methods for recording and reproducing high energy radiation images.

Abstract: A method for recording and reproducing a radiation image comprising the steps of (i) causing a phosphor, which can be stimulated by light radiation, to absorb a radiation passing through an object, (ii) stimulating said phosphor with light radiation to release the stored energy as fluorescent light, and (iii) detecting said fluorescent light with light detecting means, is characterized by the fact that said stimulating radiation is in the range of the visible light and the detected fluorescent light is in the range of the infrared radiation. Infrared emitting photostimulable phosphors include barium or strontium sulfates or solid solutions thereof doped with alkali metal ions. A method for obtaining said phosphors comprises heating at a temperature of at least 600.degree. C. A radiation image storage panel includes phosphors which, upon stimulation with visible light, emit radiation in the range of infrared region.