Patent ID: 8669529

Claim:
A radiation detection apparatus comprising: a scintillator configured to convert incident radiation into visible light; a photoelectric conversion unit including a plurality of pixels arranged in a two-dimensional array on a substrate, each pixel configured to convert the visible light into an electric signal; and a grid for removing scattered radiation including radiation-absorptive members and radiation-transmissive members arranged alternately, wherein the grid, the substrate, the photoelectric conversion unit, and the scintillator are disposed in this order from a radiation-incident side of the radiation detection apparatus to an opposite side thereof, and wherein when L denotes the distance between the surface of the grid opposite to a radiation-incident surface thereof and the radiation-incident surface of the scintillator, the distance L satisfies a condition represented by a following mathematical expression: t+T<L< 4 ×P×h/D where h denotes the thickness of the grid, D denotes the space between each two adjacent radiation-absorptive members in which one of the radiation-transmissive members is disposed, T denotes the thickness of the substrate, t denotes the thickness of the photoelectric conversion unit, and P denotes the pixel pitch of pixels.