Radiation image storage panel

1. A radiation image storage panel comprising a phosphor layer formed by a gas phase-accumulation method, wherein the phosphor layer comprises an alkali metal halide stimulable phosphor activated by an activator and has a crystal lattice having a lattice distortion in the range of 0.035 to 0.30%.

2. The radiation image storage panel of claim 1 , wherein the crystal lattice in the phosphor layer has a lattice distortion in the range of 0.040 to 0.20%.

3. The radiation image storage panel of claim 2 , wherein the crystal lattice in the phosphor layer has a lattice distortion in the range of 0.050 to 0.15%.

4. The radiation image storage panel of claim 1 , wherein the alkali metal halide stimulable phosphor activated by an activator has the following formula (I):

M I X.aM II X′ 2 .bM III X″ 3 :zA  (I)

in which M I is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; M II is at least one alkaline earth metal or divalent metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Ni, Cu, Zn and Cd; M III is at least one rare earth element or 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; each of X, X′ and X″ independently is at least one halogen selected from the group consisting of F, Cl, Br and I; A is at least one rare earth element or metal selected from the group consisting of Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Na, Mg, Cu, Ag, Il and Bi; and a, b and z are numbers satisfying the conditions of 0≦a<0.5, 0≦b<0.5 and 0<z<1.0, respectively.

5. The radiation image storage panel of claim 4 , wherein z in the formula (I) is a number satisfying the condition of 1×10 −4 ≦z≦1×10 −2 .

6. The radiation image storage panel of claim 4 , wherein M I , X and A in the formula (I) are Cs, Br and Eu, respectively.

7. The radiation image storage panel of claim 5 , wherein M I , X and A in the formula (I) are Cs, Br and Eu, respectively.