Photostimulable phosphor

A radiation image recording and reproducing method comprising the steps of:

• i. causing a radiation image storage panel containing a photostimulable phosphor to absorb radiation having passed through an object or having been radiated from an object,
• ii. exposing said image storage panel to stimulating rays to release the radiation energy stored therein as light emission, the stimulating rays being electromagnetic waves having a wavelength within the range of 600-900 nm
• iii. detecting the emitted light, wherein said photostimulable phosphor corresponds to formula (I):
• Ba.sub.1-x-y-p-3q-z Sr.sub.x M.sub.y.sup.2+ M.sub.2p.sup.1+ M.sub.2q.sup.3+ F.sub.2-a-b Br.sub.a I.sub.b :zEu
• wherein:
• M.sup.1+ is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs;
• M.sup.2+ is at least one divalent metal selected from the group consisting of Ca Mg and Pb;
• M.sup.3+ is at least one trivalent 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.ltoreq.x.ltoreq.0.30, 0.ltoreq.y.ltoreq.0.10, 0.ltoreq.p.ltoreq.0.3, 0.ltoreq.q.ltoreq.0.1, 0.05.ltoreq.a.ltoreq.0.76, 0.20.ltoreq.b.ltoreq.0.90, a+b<1.00 and 10.sup.-6 .ltoreq.z.ltoreq.0.2.