Patent ID: 8338789

Claim:
A radiation detector that detects radiation in a first energy range and radiation in a second energy range entered from a front side, comprising: a first scintillator layer extending along a predetermined direction, for converting radiation in the first energy range to light; a first photodetector having a plurality of first photo-detecting sections being disposed one-dimensionally along the predetermined direction and fixed to a front side of the first scintillator layer, for converting light converted by the first scintillator layer to an electrical signal, and a first substrate with the first photo-detecting sections provided; a second scintillator layer extending in the predetermined direction and being brought in contact with a rear side of the first scintillator layer, for converting radiation in the second energy range to light; and a second photodetector having a plurality of second photo-detecting sections being disposed one-dimensionally along the predetermined direction and fixed to a rear side of the second scintillator layer, for converting light converted by the second scintillator layer to an electrical signal, and a second substrate with the second photo-detecting sections provided, wherein direction of extension of the first substrate and direction of extension of the second substrate are identical to each other, when viewed from a front side, in a direction perpendicular to the predetermined direction, one edge portion of the first substrate is located outside further than one edge portion of the second substrate, and the other edge portion of the second substrate is located outside further than the other edge portion of the first substrate.