Patent ID: 9329301
Filing Date: 2016-05-03
CPC Classification: G01V

Claim Text:
1. A radiation detection device for a foreign substance inspection using a subtraction method, which detects radiation in a first energy range and radiation in a second energy range higher than the radiation in the first energy range that are transmitted through a specimen and incident from a radiation incident direction, comprising: a first radiation detector that is positioned on the upstream side with respect to the radiation incident direction and detects radiation in the first energy range; and a second radiation detector that is positioned on the downstream side with respect to the radiation incident direction and detects radiation in the second energy range, wherein the first radiation detector includes a first scintillator layer that extends along an image detection direction and converts an image of radiation in the first energy range into an optical image, and a first pixel section that has a plurality of pixels arrayed along the image detection direction and acquires a first image based on the optical image converted by the first scintillator layer, the second radiation detector includes a second scintillator layer that extends along the image detection direction and converts an image of radiation in the second energy range into an optical image, and a second pixel section that has a plurality of pixels arrayed along the image detection direction and acquires a second image based on the optical image converted by the second scintillator layer, the thickness of the first scintillator layer is smaller than the thickness of the second scintillator layer, a first area of each of the plurality of pixels in the first pixel section is smaller than a second area of each of the plurality of pixels in the second pixel section, and a number of pixels of the first pixel section is greater than a number of pixels of the second pixel section and the pixel pitch of the pixels in the second pixel section is n times the pixel pitch of the pixels in the first pixel section, where n is a positive integer.