Patent Number: 
Section: claims

1. A radiation image storage panel having a phosphor layer which comprises a stimulable cerium activated lutetium borate phosphor represented by the following formula (I):(Lux,Lny)BO3:aCe,bA  (I)in which Ln is at least one rare earth element selected from the group consisting of Y, La and Gd; A is at least one element selected from the group consisting of Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb and Zr; and x, y, a and b are numbers satisfying the conditions of 0.5≦x<1, 0≦y<0.5, 0<a≦0.2, 0≦b≦0.2 and x+y+a+b=1.0. 2. The radiation image storage panel of claim 1, in which A of the formula (I) is Sm or Zr. 3. The radiation image storage panel of claim 1, in which b of the formula (I) is 0. 4. The radiation image storage panel of claim 1, in which y of the formula (I) is 0. 5. The radiation image storage panel of claim 1, which comprises a support, the phosphor layer and a protective layer in order. 6. A method for producing a stimulated emission which comprises the steps of:applying a radiation to a stimulable cerium activated lutetium borate phosphor of the following formula (I):(Lux,Lny)BO3:aCe,bA  (I)in which Ln is at least one rare earth element selected from the group consisting of Y, La and Gd; A is at least one element selected from the group consisting of Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb and Zr; and x, y, a and b are numbers satisfying the conditions of 0.5≦x<1, 0≦y<0.5, 0<a≦0.2, 0≦b≦0.2 and x+y+a+b=1.0, whereby storing an energy of the radiation in the phosphor andstimulating the phosphor in which the energy of the radiation is stored with a stimulating light, whereby giving a stimulated emission off. 7. The method of claim 6, in which A of the formula (I) is Sm or Zr. 8. The method of claim 6, in which b of the formula (I) is 0. 9. The method of claim 6, in which y of the formula (I) is 0. 10. A radiation image recording and reproducing method comprising the steps of:exposing the radiation image storage panel of claim 1 to a radiation having passed through an object or having radiated from an object, whereby a spatial energy distribution of the radiation is recorded as a latent image in the phosphor layer of the storage panel;irradiating the storage panel with a stimulating light to emit a stimulated light from the latent image in the phosphor layer;photoelectrically detecting and converting the stimulated light to image signals; andforming a radiation image from the image signals.