Abstract: There is provided a photostimulable phosphor according 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 :zEuwherein: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 metal selected from the group consisting of Ca Mg and Pb;M.sup.3+ 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.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.

Abstract: There is provided a photostimulable phosphor according 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 :zEuwherein: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 metal selected from the group consisting of Ca Mg and Pb;M.sup.3+ 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.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.

Abstract: A phosphor screen is provided, characterised in that said screen comprises at least one organozinc compound corresponding to the following general formula I: ##STR1## wherein: A=either carbon or phosphorusY=--OR.sup.6, --NR.sup.7 R.sup.8, alkyl or aryl, wherein R.sup.6, R.sup.7 and R.sup.8 each independently represent a substituted or unsubstituted alkyl- or aryl group, or wherein R.sup.7 and R.sup.8 together form a ringstructuren=1 when A is carbonn=2 when A is phosphorus.

Abstract: A phosphor screen is provided comprising a satiblizer being an organic compound or an oligomeric or polymeric compound comprising moieties corresponding to the following general formula I: ##STR1## wherein: R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently represent a substituted or unsubstituted alkyl- or aryl group,R.sup.5 represents hydrogen or a substituted or unsibstituted alkyl group andZ represents the atoms necessary to form a substituted or unsubstituted 5 to 8 membered ring.

Abstract: A method for preparing metal halide phosphor particles, e.g. barium- and/or strontium-containing halide phosphor particles, of a selected particle size range with improved powder flowability which method comprises the following steps:(1) firing the raw mixture materials of said phosphor to produce a sintered phosphor mass that is pulverized,(2) mixing said pulverized phosphor mass, optionally after one or more firings, in a liquid mainly containing a water-miscible organic solvent with an organic acid dissolved therein, said acid being capable of forming with metal contained in the phosphor a salt the solubility of which in water at 20.degree. C. is less than 0.5 g per 100 ml, and(3) subjecting the thus treated phosphor particles in wet and/or in dry state to a separation treatment to collect phosphor particles having a grain size smaller than 40 .mu.m but larger than 2 .mu.m.

Abstract: A photostimulable X-ray energy absorbing halosilicate phosphor, characterized in that said phosphor contains as host metal at least one alkaline earth metal, as halogen at least one member selected from the group consisting of Cl, Br and I, as dopant Eu.sup.2+ and lithium as co-dopant.