Patent ID: 6864491

Claim:
A radiation image conversion panel comprising a support provided thereon a stimulable phosphor layer and a protective layer of the stimulable phosphor layer, the protective layer including an alumina-evaporated layer, wherein the protective layer has a light transmittance of not more than 80% to light having a wavelength of not more than 400 nm and has a light transmittance of not less than 80% to light having a wavelength of not less than 410 nm, and the stimulable phosphor layer contains an alkali halide stimulable phosphor represented by a formula selected from the group consisting of the following Formulae (1) to (3), M(I)X. a M(II)X′ 2 .b M(III)X″ 3 :cA Formula (1) wherein M(I) is Rb or Cs; M(II) is a divalent metal selected from the group consisting of Mg, Ca, Sr, Ba, Zn, Cd and Ni; M(III) is a trivalent metal selected from the group consisting of Sc, Y, La, Pm, Lu, Al, Ga and In; each of X, X′ and X″ is a halogen selected from the group consisting of Cl, Br and I; A is an activator selected from the group consisting of Eu, In, Ga, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er Gd, Sm, Tl, Na, Ag and Cu; a is a numeric value in the range of 0<a<0.5, provided that a is a numeric value in the range of 0<a<0.25 when A is Eu; b is a numeric value in the range of 0≦b<0.5; and c is a numeric value in the range of 0<c≦0.2, (1 −x )CsBr. x M(I)X. a M(II)X′ 2 .b M(III)X″ 3 :c Eu: d A Formula (2) wherein M(I) is Rb or Cs; M(II) is a divalent metal selected from the group consisting of Be, Mg, Ca, Sr and ba; M(III) is a trivalent metal selected from the group consisting of Y, La, Lu, Al, Ga and In; each of X, X′ and X″ is a halogen selected from the group consisting of F, Cl, Br and I; each of Eu and A is an activator, and the activator A is a metal selected from the group consisting of In, Ga, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Sm, Tl, Na, Ag and Cu; and each x, a, b, c and d is a numeric value in the range of 0≦x≦0.4, 0.7≦x≦1.0, 0≦a≦0.5, 0≦b<0.5, 0<C<0.2 and 0≦d<0.2, (1 −x )RbBr. x M(I)X. a M(II)X′ 2 .b M(III)X″ 3 :c Eu: d A Formula (3) wherein M(I) is Rb or Cs; M(II) is a divalent metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Zn, Cd and Ni; M(III) is a trivalent metal selected from the group consisting of Sc, Y, La, Pm, Lu, Al, Ga and In; each of X, X′ and X″ is a halogen selected from the group consisting of F, Cl, Br and I; each of Eu and A is an activator, and the activator A is a metal selected from the group consisting of In, Ga, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Sm, Na, Ag, Cu, Pb, Bi, and Mn; and each x, a, b, c and d is a numeric value in the range of 0≦x≦0.4, 0.7≦x≦1.0, 0≦a≦0.5, 0≦b<0.5, 0<C<0.2 and 0≦d<0.2.