CALCIUM TUNGSTATE PHOSPHOR AND RADIATION-SENSITIZED PAPER PREPARED THEREFROM

PURPOSE:To obtain CaWO4 which exhibits extremely decreased afterglow and high emmision luminance under X-ray excitation and is useful for radiation- sensitized paper with high sensitivity by incorporating a specified amt. of at least one of Bi and Sn in a matrix of calcium tungstate. CONSTITUTION:A...

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Hauptverfasser:	SHIRONOKUCHI TAKASHI, SHIMIZU ETSUO, SUZUKI HIDEO, SHIGETA KITARO, SUZUKI YUJIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES GAMMA RAY OR X-RAY MICROSCOPES IMPREGNATING OR COATING OF PAPER IRRADIATION DEVICES MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE MEASUREMENT OF NUCLEAR OR X-RADIATION MEASURING METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NUCLEAR ENGINEERING NUCLEAR PHYSICS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING 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 TESTING TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain CaWO4 which exhibits extremely decreased afterglow and high emmision luminance under X-ray excitation and is useful for radiation- sensitized paper with high sensitivity by incorporating a specified amt. of at least one of Bi and Sn in a matrix of calcium tungstate. CONSTITUTION:A calcium tungstate phosphor wherein at least one of bismuth and tin is incorporated in a matrix of calcium tungstate, the contents of the bismuth and tin are respectively 0.1-50ppm and 0.1-10ppm based on the matrix, and the total amt. of bismuth and tin is 0.1-100. This phosphor exhibits remarkably decreased X-ray afterglow and a radiation-sensitized paper prepared therefrom can decrease afterglow without decreasing photographic sensitivity in comparison with a radiation-sensitized paper using the conventional CaWO4 contg. neither bismuth nor tin.