Radiographic image conversion screens

Details Radiographic image conversion screens Radiographic image conversion screens

G - Physics

21

K

117/20, 358/27

G21K 4/00 (2006.01)

Patent

CA 1191623

ABSTRACT OF THE DISCLOSURE A radiographic image conversion screen comprises a support, a first fluorescent layer formed on the support and consisting essentially of a blue emitting phosphor and a second fluorescent layer formed on the first flouresent layer and consisting essentially of a green emitting rare earth phosphor. Desirably the blue emitting phosphor is dt least one selected from the group consisting of (I) a yttrium or yttrium-gadolinium oxysulfide phosphor represented by the formula (Y1-c-d-e'Gdc,Tbd,Tme) 202S where c,d and e are numbers meeting the conditions of 0? c ?0.60. 0.0005 ? d ? 0.02 and 0 ? e ?0.01, respectively, (II) an alkaline earth metal complex halide phosphor represented by the formula MeF2 . pMe'X2 . qKX' .rMe"S04: mEu 2+, nTb3+ where Me is at least one selected from magnesium, calcium, strontium and barium, each of Me' and Me" is at least one selected from calcium, strontium and barium, each of X and X' is at least one selected from chlorine and bromine, and p, q, r, m and n are numbers meeting the conditions of 0.80 ? p ? 1.5, 0 ? q ? 2.0, 0 ? r ? 1.0, 0.001 ? m ? 0.10 and 0 ? n ? 0.05, respectively, (III) a rare earth oxyhalide phosphor represented by the formula (Ln'1-x-y-z' TbX, Tmy, Ybz)OX where Ln' is at least one selected from lanthanum and gadolinium, X is at least one selected from chlorine and bromine, and x, y, and z are numbers meeting the conditions of 0 ? x ? 0.01, 0 ?y ? 0.01, 0 ? z ? 0.005 and 0 ? x + y, Desirably the green emitting phosphor is a rare earth oxysulfide phosphor represented by the formula (Ln1-a-b, Tba Tmb) 202S where Ln is at least one selected from lantranum, gadolinium and lutetium, and a and b are numbers meeting the conditions of 0.0005 ? a ? 0.09 and 0 ? b ? 0.01, respectively, or the formula (Yl-i-a-b'Lnj,lba,Tmb) 202S where in is at least one selected from lanthanum, gado??nium and ??? ??? and ?, a and h are numbers meeting the conditions of 0.0005, 0.6, 0.95, 0.0005 ? a ? 0.09 and 0 ? 0.01, respectively.

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