Radiation image conversion panel

Abstract

A radiation image conversion panel comprising a phosphor sheet having a stimulable phosphor layer and a protective layer provided so as to cover the surface of the phosphor layer, wherein the average slant angle Δa of the surface roughness of the outer surface of the protective layer not adjacent with the phosphor layer is from 0.01 to 0.1 and the surface roughness Ra in μm of the inner side or the phophor sheet side of the protective layer is 0.05 μm to 0.45 μm, and the stimulable phosphor layer is provided by a coating method.

1 . A radiation image conversion panel comprising a phosphor sheet having a stimulable phosphor layer and a protective layer provided so as to cover the surface of the phosphor layer, wherein the average slant angle Δa of the surface roughness of the outer surface of the protective layer not adjacent with the phosphor layer is from 0.01 to 0.1 and the surface roughness Ra in μm of the inner side or the phosphor sheet side of the protective layer is 0.05 μm to 0.45 μm, and the stimulable phosphor layer is provided by a coating provided type.  
   
   
       2 . The radiation image conversion panel of  claim 1  wherein the protective layer comprises a stimulating light absorbing layer being colored to absorb the stimulating light.  
   
   
       3 . The radiation image conversion panel of  claim 1 , wherein a binder to be used in the stimulable phosphor layer is selected from proteins such as gelatin, polysaccharide such as dextrin, natural polymers such as gum arabic, and synthesized polymers such as poly(vinyl butyral), poly(vinyl acetate), nitrocellulose, ethyl cellulose, vinylidene chloride-vinyl chloride copolymer, poly(alkyl acrylate), poly(alkyl methacrylate), vinyl chloride-vinyl acetate copolymer, polyurethane, cellulose acetate butylate, poly(vinyl alcohol) and linear polyester.  
   
   
       4 . The radiation image conversion panel of  claim 3 , wherein the binder is selected from nitrocellulose, linear polyester, poly(alkyl acrylate), poly(alkyl methacrylate), a mixture of nitrocellulose and linear polyester, a mixture of nitrocellulose and poly(alkyl acrylate) or poly(alkyl methacrylate) and a mixture of polyurethane and poly(vinyl butyral).  
   
   
       5 . The radiation image conversion panel of  claim 1 , wherein the ratio of the amount of the binder to be used in the stimulable phosphor layer to that of the stimulable phosphor is within the range of from 0.03 to 0.2 parts by weight per one part by weight of the stimulable phosphor.  
   
   
       6 . The radiation image conversion panel of  claim 1 , wherein the panel is composed of the phosphor sheet cut into a designated size and moisture proof films provided on both sides of the phosphor sheet and the films are each substantially not adhered with the phosphor sheet and the circumferences thereof are arranged at the outside of the circumference of the phosphor sheet so as to cover the entire surface of the phosphor sheet.  
   
   
       7 . A radiation image conversion panel comprising a phosphor sheet having a stimulable phosphor layer and a protective layer provided so as to cover the surface of the phosphor layer, wherein the average slant angle Δa of the surface roughness of the outer surface of the protective layer not adjacent with the phosphor layer is from 0.01 to 0.1 and the surface roughness Ra in μm of the inner side or the phosphor sheet side of the protective layer is 0.05 μm to 0.45 μm, and the stimulable phosphor layer is provided by a gas phase accumulation type.  
   
   
       8 . The radiation image conversion panel of  claim 7 , wherein the protective layer comprises a stimulating light absorbing layer being colored to absorb the stimulating light.  
   
   
       9 . The radiation image conversion panel of  claim 7 , wherein the stimulable phosphor constituting the stimulable phosphor layer is alkali halide type stimulable phosphor represented by Formula 1:  
       M1X.aM2X′ 2 .bM3X″ 3 :eA   Formula 1  
     wherein M1 is an alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; M2 is a divalent metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Zn, Cd, Cu and Ni; M3 is a trivalent metal selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Al, Ga and In; X, X′ and X″ are each a halogen selected from the group consisting of F, Cl, Br and I; A is a metal selected from the group consisting of Eu, Tb, In, Cs, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu and Mg; and a, b and e are each a value within the range of 0≦a<0.5, 0≦b<0.5 and 0<e≦0.2, respectively.  
   
   
       10 . The radiation image conversion panel of  claim 9 , wherein the stimulable phosphor constituting the stimulable phosphor layer is represented by Formula 2:  
       CsX:A   Formula 2  
     in which X is Br or I, and A is Eu, In, Ga or Ce.  
   
   
       11 . The radiation image conversion panel of  claim 10 , wherein the stimulable phosphor constituting the stimulable phosphor layer is CsBr type phosphor.  
   
   
       12 . The radiation image conversion panel of  claim 7 , wherein the panel is composed of the phosphor sheet cut into a designated size and moisture proof films provided on both sides of the phosphor sheet and the films are each substantially not adhered with the phosphor sheet and the circumferences thereof are arranged at outside of the circumference of the phosphor sheet so as to cover the entire surface of the phosphor sheet.