There is provided a photostimulable phosphor according to formula (I)Ba1-x-y-p-3q-zSrxMy2+M2p1+M2q3+F2-a-bBraIb:zEuwherein: M1+ is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; M2+ is at least one metal selected from the group consisting of Ca Mg and Pb; M3+ is at least one metal selected from the group consisting of Al, Ga, In, Tl, Sb, Bi, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; 0<x</=0.30, 0</=y</=0.10, 0</=p</=0.3, 0</=q</=0.1, 0.05</=a</=0.76, 0.20</=b</=0.90, a+b<1.00 and 10-6</=z</=0.2.