Radiographic image conversion panel, method for manufacturing the same, method for forming phosphor particle, method for forming photostimulable phosphor precursor, phosphor precursor and photostimulable phosphor

Abstract

A radiographic image conversion panel includes: a support; and at least one photostimulable phosphor layer provided on the support, wherein at least one layer of the photostimulable phosphor layers contains a photostimulable phosphor using an alkali halide represented by a general formula.

1 . A radiographic image conversion panel comprising: 
 a support; and    at least one photostimulable phosphor layer provided on the support,    wherein at least one layer of the photostimulable phosphor layers contains a photostimulable phosphor using an alkali halide represented by a following general formula (1) as a ground material, and    the photostimulable phosphor layer is formed so as to have a thickness from 50 μm to 20 mm by a vapor phase growth method, and a mean crystal size in the photostimulable phosphor of the photostimulable phosphor layer is from 90 to 1000 nm, and    the general formula (1) is expressed by        M   1   X·aM   2   X′   2   ·bM   3   X″   3   :eA   (1)    wherein the M 1  is at least one kind of alkali metal selected from a group consisting of Li, Na, K, Rb and Cs, the M 2  is at least one kind of bivalent metal atom selected from a group consisting of Be, Mg, Ca, Sr, Ba, Zn, Cd, Cu and Ni, the M 3  is at least one kind of trivalent metal atom selected from a group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Al, Ga and In, each of the X, the X′ and the X″ is at least one kind of halogen selected from a group consisting of F, Cl, Br and I, the A is at least one kind of metal atom selected from a group consisting of Eu, Tb, In, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Ti, Na, Ag, Cu and Mg and each of the a, the b and the e represents a numeric value in a range of 0≦a<0.5, 0≦b<0.5 and 0<e≦0.2.    
   
   
       2 . The radiographic image conversion panel of  claim 1 , wherein the photostimulable phosphor is CsBr:Eu.  
   
   
       3 . A method for manufacturing the radiographic image conversion panel of  claim 1 , comprising controlling a deposition rate of a main agent of the photostimulable phosphor and a deposition rate of an activator of the photostimulable phosphor by at least two or more systems.  
   
   
       4 . A method for manufacturing a radiographic image conversion panel comprising a support and a photostimulable phosphor layer provided on the support; the method comprising adding Rb atoms to a photostimulable phosphor of the photostimulable phosphor layer so that a ratio of the Rb atoms to Cs atoms is 1/1,000,000 to 5/1,000 mol.  
   
   
       5 . A radiographic image conversion panel comprising a photostimulable phosphor obtained by the method for manufacturing the radiographic image conversion panel of  claim 4 , wherein in the photostimulable phosphor, a main peak is shown from a (400) face in accordance with a result of X-ray diffraction.  
   
   
       6 . The radiographic image conversion panel of  claim 5 , comprising: a photostimulable phosphor layer,  
     wherein the photostimulable phosphor layers contains the photostimulable phosphor using an alkali halide represented by a following general formula (1) as a ground material,  
     the photostimulable phosphor layer is formed by spherical phosphor particles and a polymer material,  
     the photostimulable phosphor layer is formed so as to have a thickness from 50 μm to 20 mm,  
     the general formula (1) is expressed by  
         M   1   X·aM   2   X′   2   ·bM   3   X″   3   :eA   (1)  wherein the M 1  is at least one kind of alkali metal selected from a group consisting of Li, Na, K, Rb and Cs, the M 2  is at least one kind of bivalent metal atom selected from a group consisting of Be, Mg, Ca, Sr, Ba, Zn, Cd, Cu and Ni, the M 3  is at least one kind of trivalent metal atom selected from a group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Al, Ga and In, each of the X, the X′ and the X″ is at least one kind of halogen selected from a group consisting of F, Cl, Br and I, the A is at least one kind of metal atom selected from a group consisting of Eu, Tb, In, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Ti, Na, Ag, Cu and Mg and each of the a, the b and the e represents a numeric value in a range of 0≦a<0.5, 0≦b<0.5 and 0<e≦0.2.    
   
   
       7 . The radiographic image conversion panel of  claim 5 , wherein phosphor fine particles in the photostimulable phosphor are formed by heating at 400° C. or more.  
   
   
       8 . A photostimulable phosphor precursor, wherein phosphor particles in the radiographic image conversion panel of  claim 5  are formed in a vacuum.  
   
   
       9 . A method for forming the photostimulable phosphor precursor of  claim 8 , comprising: 
 sequentially forming a liquid membrane phase in a liquid phase containing Cs atoms, and    adding an organic solvent having a solubility different from that of the liquid phase containing Cs atoms under stirring.    
   
   
       10 . A photostimulable phosphor obtained by calcining the phosphor precursor of  claim 8  at 600 to 800° C.