Patent ID: 8981310
Filing Date: 2015-03-17
Classification: G01N,G01V

Abstract:
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 generates a first image corresponding to an image of the radiation; 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 and generates a second image corresponding to an image of the radiation; a first image processing section that applies image processing to the first image from the first radiation detector; and a second image processing section that applies image processing to the second image from the second radiation detector, wherein the first radiation detector includes a first pixel section that has a plurality of pixels arrayed along an image detection direction and acquires the first image based on the image of the radiation in the first energy range, the second radiation detector includes a second pixel section that has a plurality of pixels arrayed along the image detection direction and acquires the second image based on the image of the radiation in the second energy range, a first pixel width in the image detection direction of each of the plurality of pixels in the first pixel section is smaller than a second pixel width in the image detection direction of each of the plurality of pixels in the second pixel section, and the first image processing section and the second image processing section carry out pixel change processing to make the number of pixels of the first image and the number of pixels of the second image equal to each other.