Patent ID: 8155894

Claim:
An X-ray inspection apparatus comprising: an X-ray emitting section that emits an X-ray beam at an article; an X-ray detecting section that detects the X-ray that has passed through the article and determines whether the article is defective based on a result of a comparison between a strength of the X-ray detected by the X-ray detecting section and a prescribed reference value; a storage device configured to store a plurality of detection data corresponding to strengths of the X-rays acquired by the X-ray detecting section during inspection of a plurality of articles; a setting device configured to set a hypothetical reference value that is different from the prescribed reference value used during the inspection of the plurality of articles; a determining device configured to determine whether a contaminant exists inside each of the plurality of articles based on a result of a comparison between the hypothetical reference value and each of the detection data stored in the storage device; a calculating device configured to calculate a hypothetical contaminant existence rate as a ratio of a number of the plurality of articles in which the determining device has determined that a contaminant exists with respect to a total number of the plurality of articles; and a display control device configured to control a display section to indicate the hypothetical contaminant existence rate.