Patent ID: 8363781

Claim:
A nondestructive identification method configured to irradiate a radiation ray of an x-ray or a γ-ray from a radiation source to a sample, and to identify contents inside the sample from a transmission image of the radiation ray having transmitted the sample, the method comprising: obtaining a first transmission image by irradiating a radiation ray to the sample and one or more standard samples made of a known material, with energy of the radiation source being first energy; obtaining a second transmission image by irradiating the radiation ray to the sample and the one or more standard samples, with the energy of the radiation source being second energy different from the first energy; performing luminance adjustment on the second transmission image to make a luminance value of a part of the standard sample in the second transmission image be almost the same as a luminance value of a part of the standard sample in the first transmission image; and obtaining an image in which only a part of the same material as the standard sample is deleted, by taking a difference between the second transmission image on which the luminance adjustment is performed and the first transmission image.