X-RAY INTENSIFYING SCREEN

This invention concerns an intensifying screen using a phosphor capable of emitting light under X-ray excitation. This intensifying screen is characterized by the fact that the phosphor layer in the intensifying screen comprises a first phosphor layer containing a phosphor represented by the general...

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Bibliographic Details
Main Authors YOKOTA, KAZUTO, SAITO, AKIHISA
Format Patent
LanguageEnglish
Published 23.05.1990
Subjects
ADHESIVES
AUXILIARY PROCESSES IN PHOTOGRAPHY
CHEMISTRY
CINEMATOGRAPHY
DYES
ELECTROGRAPHY
GAMMA RAY OR X-RAY MICROSCOPES
HOLOGRAPHY
IMPREGNATING OR COATING OF PAPER
IRRADIATION DEVICES
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
NUCLEAR ENGINEERING
NUCLEAR PHYSICS
PAINTS
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES
PHOTOGRAPHY
PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES
PHYSICS
POLISHES
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOTOTHERWISE PROVIDED FOR
TEXTILES
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Summary:This invention concerns an intensifying screen using a phosphor capable of emitting light under X-ray excitation. This intensifying screen is characterized by the fact that the phosphor layer in the intensifying screen comprises a first phosphor layer containing a phosphor represented by the general formula (I): MaLn1-x-(2/3)aDO4:XR <+> (I) (wherein M stands for at least one divalent metal element selected from the group consisting of Be, Mg, Ca, Sr, Ba, Zn, and Cd, Ln for at least one element selected from the group consisting of Y, Gd, La, and Lu, D for either or both of Ta and Nb, R for at least one member selected from the group consisting of Tm, Pr, Sm, Eu, Tb, Dy, Yb, and self-activators, a for a value satisfying the expression, 0 < a </= 1, and x for a value satisfying the expression, 0 </= x </= 0.05) and formed on the aforementioned substrate side and a second phosphor layer containing CaWO4 and formed on the aforementioned protective layer side. Owing to this characteristic feature, the intensifying screen enjoys improved granularity without any sacrifice of sensitivity or sharpness.
Bibliography:Application Number: EP19870302696