Ceramic scintillator array, X-ray detector, and X-ray inspection device
View Patent ↗A ceramic scintillator array of an embodiment includes: a plurality of scintillator segments each composed of a sintered compact of a rare earth oxysulfide phosphor; a first reflective layer interposed between the scintillator segments adjacent to each other; and a second reflective layer arranged on a side of surfaces, on which an X-ray is incident, of the plurality of scintillator segments. A difference in dimension between an end portion of a surface of the second reflective layer and a most convex portion of the surface of the second reflective layer is 30 μm or less.
1. A ceramic scintillator array comprising:
a plurality of scintillator segments each composed of a sintered compact of a rare earth oxysulfide phosphor;
a first reflective layer interposed between the scintillator segments adjacent to each other in a manner to integrate the plurality of scintillator segments, the first reflective layer comprising a first transparent resin and first reflective particles dispersed in the first transparent resin; and
a second reflective layer arranged on a side of surfaces on which an X-ray is incident of the plurality of scintillator segments, the second reflective layer comprising a second transparent resin and second reflective particles dispersed in the second transparent resin;
wherein a glass transition point of the first transparent resin is 60° C. or higher, and a molecular structure of the first transparent resin has a cyclo structure including no double bond,
wherein a glass transition point of the second transparent resin is 30° C. or lower, and a molecular structure of the second transparent resin has a double bond,
wherein the first reflective layer contains, by mass ratio, 15% or more and 60% or less of the first transparent resin and 40% or more and 85% or less of the first reflective particles, and
wherein the second reflective layer contains, by mass ratio, 15% or more and 60% or less of the second transparent resin and 40% or more and 85% or less of the second reflective particles.
2. The ceramic scintillator array according to claim 1 , wherein
the second reflective particles are the same particles as the first reflective particles.
3. The ceramic scintillator array according to claim 1 , wherein each of the first and second reflective particles include particles of at least one inorganic substance selected from the group consisting of titanium oxide, alumina, barium sulfide, and zinc oxide.
4. The ceramic scintillator array according to claim 1 , wherein each of the first and second transparent resins contains at least one selected from the group consisting of an epoxy resin, a silicone resin, a phenol resin, a urea resin, a melamine resin, unsaturated polyester, polyurethane, an acrylic resin, and polyethylene terephthalate.
5. The ceramic scintillator array according to claim 1 , wherein
the rare earth oxysulfide phosphor has a composition expressed by a general formula:
RE 2 O 2 S:Pr,
wherein RE is at least one selected from the group consisting of Y, Gd, La, and Lu, and a content of Pr relative to RE 2 O 2 S is 0.001 mol % or more and 10 mol % or less.
6. The ceramic scintillator array according to claim 5 , wherein
the rare earth oxysulfide phosphor contains a gadolinium oxysulfide phosphor containing Pr as an activator.
7. An X-ray detector comprising the ceramic scintillator array according to claim 1 .
8. An X-ray inspection device comprising the X-ray detector according to claim 7 .