Stimulable phosphor screens or panels and manufacturing control thereof

Abstract

Stimulable phosphor screens, sheets or panels having alkali metal halide storage phosphors have been disclosed, said phosphors showing emission of red light, after stimulation with an ultraviolet radiation source having a radiation emission maximum of 365 nm, wherein an intensity of red light is not higher than 10% of the blue light emission intensity, and wherein both emission intensities having been measured after stimulation of the said storage phosphors in the phosphor layer of the panel, having stored energy from radiation in the wavelength range shorter than 350 nm.

1 . A stimulable phosphor screen, the phosphors of which, whether situated in the cental part or at the edges thereof, have stored energy from radiation in the wavelength range shorter than 350 nm, characterized in that a ratio of intensities of red and blue stimulated light, after stimulation of said phosphors with an ultraviolet radiation source having a radiation emission maximum wavelength of 365 nm or more, is not more than 1:10.  
     
     
         2 . A stimulable phosphor screen according to  claim 1 , wherein said ratio is not more than 1:20.  
     
     
         3 . A stimulable phosphor screen according to  claim 1 , wherein said phosphor is present in a binderless layer.  
     
     
         4 . A stimulable phosphor screen according to  claim 2 , wherein said phosphor is present in a binderless layer.  
     
     
         5 . A stimulable phosphor screen according to  claim 3 , wherein said binderless phosphor layer comprises a binderless needle-shaped CsX:Eu phosphor, wherein X represents a halide selected from the group consisting of Br and a combinations of Br with Cl and/or I.  
     
     
         6 . A stimulable phosphor screen according to  claim 4 , wherein said binderless phosphor layer comprises a binderless needle-shaped CsX:Eu phosphor, wherein X represents a halide selected from the group consisting of Br and a combinations of Br with Cl and/or I.  
     
     
         7 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 1 , said method comprising the steps of 
 exposing said screens to radiation in the wavelength range shorter than 350 nm,    stimulating said screens with with an ultraviolet radiation source having a radiation emission maximum wavelength of more than 350 nm,    detecting stimulated emission and measuring maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum,    calculating ratios of said maximum emission intensities.    
     
     
         8 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 2 , said method comprising the steps of 
 exposing said screens to radiation in the wavelength range shorter than 350 nm,    stimulating said screens with with an ultraviolet radiation source having a radiation emission maximum wavelength of more than 350 nm,    detecting stimulated emission and measuring maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum,    calculating ratios of said maximum emission intensities.    
     
     
         9 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 3 , said method comprising the steps of 
 exposing said screens to radiation in the wavelength range shorter than 350 nm,    stimulating said screens with with an ultraviolet radiation source having a radiation emission maximum wavelength of more than 350 nm,    detecting stimulated emission and measuring maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum,    calculating ratios of said maximum emission intensities.    
     
     
         10 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 4 , said method comprising the steps of 
 exposing said screens to radiation in the wavelength range shorter than 350 nm,    stimulating said screens with with an ultraviolet radiation source having a radiation emission maximum wavelength of more than 350 nm,    detecting stimulated emission and measuring maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum,    calculating ratios of said maximum emission intensities.    
     
     
         11 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 5 , said method comprising the steps of 
 exposing said screens to radiation in the wavelength range shorter than 350 nm,    stimulating said screens with with an ultraviolet radiation source having a radiation emission maximum wavelength of more than 350 nm,    detecting stimulated emission and measuring maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum,    calculating ratios of said maximum emission intensities.    
     
     
         12 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 6 , said method comprising the steps of 
 exposing said screens to radiation in the wavelength range shorter than 350 nm,    stimulating said screens with with an ultraviolet radiation source having a radiation emission maximum wavelength of more than 350 nm,    detecting stimulated emission and measuring maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum,    calculating ratios of said maximum emission intensities.    
     
     
         13 . Method according to  claim 7 , wherein after calculating ratios of more than 1:5, said screens and phosphors are recovered.  
     
     
         14 . Method according to  claim 7 , wherein after calculating ratios of more than 1:10, said screens and phosphors are recovered.  
     
     
         15 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 7 , wherein after calculating differences in ratios between the cental part and at the edges of more than 20%, said screens and phosphors are recovered.  
     
     
         16 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 7 , wherein after calculating differences in ratios between the cental part and at the edges of more than 10%, said screens and phosphors are recovered.  
     
     
         17 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 7 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         18 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 8 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         19 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 9 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         20 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 10 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         21 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 11 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         22 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 12 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         23 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 13 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         24 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 14 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         25 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 15 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.  
     
     
         26 . Method of controlling manufacturing of stimulable phosphor screens according to  claim 16 , wherein detecting maximum emission intensities for said emission in the red and blue wavelength range of the visible light spectrum proceeds with same red and blue light transmitting filters.