Patent Number: 
Section: claims

1. A scintillator array comprising:a first scintillator element;a second scintillator element; anda reflector provided between the first and second scintillator elements and having a width of 80 μm or less therebetween,wherein each scintillator element includes a polycrystal containing a rare earth oxysulfide phosphor, the polycrystal having a radiation incident surface of 1 mm or less×1 mm or less in area,wherein an average crystal grain diameter of the polycrystal is not less than 5 μm nor more than 30 μm, the average crystal grain diameter being defined by an average intercept length of crystal grains in an observation image of the polycrystal with a scanning electron microscope,wherein a maximum length or a maximum diameter of defects on the polycrystal is 40 μm or less, andwherein a ratio of a total area of defects on a scanning surface to an area thereof is 10% or less, the ratio being, defined by inspecting an inside of the polycrystal under a measurement condition including a frequency of 200 MHz, a focal length of 2.9 mm, a scanning pitch of 2.5 μm, a scanning surface size of 1 mm×1 mm, a sample thickness of 1 mm, and a detection limit defect length of 3 μm using ultrasonic flaw detection. 2. The scintillator array according to claim 1, wherein the defect includes at least one selected from the group consisting of a hole, a flaw, a foreign material including a component different from a component of the rare earth oxysulfide phosphor, a hetero-phase having the same components as components of, and a crystal structure different from a crystal structure of, the rare earth oxysulfide phosphor, and a hetero-phase including a component different from a component of the rare earth oxysulfide phosphor. 3. The scintillator array according to claim 1, wherein the rare earth oxysulfide phosphor is expressed by a formula of A2O2S:Pr, wherein A is at least one element selected from the group consisting of Y, Gd, La and Lu,or wherein the rare earth oxysulfide phosphor is expressed by a formula of (Gd1-xA′x)2O2S:Pr, wherein A′ is at least one element selected from the group consisting of Y, La and Lu, and x is a number satisfying 0≤x≤0.1. 4. The scintillator array according to claim 3, wherein the rare earth oxysulfide phosphor contains at least one element selected from the group consisting of cerium, zirconium, and phosphorus. 5. A radiation detector comprising:the scintillator array according to claim 1; anda photoelectric converter to convert light from the scintillator array into electricity. 6. A radiation inspection device comprising:a radiation source to irradiate an inspection object with radiation rays; andthe radiation detector according to claim 5, the radiation detector being configured to detect radiation rays through the inspection object.