Patent ID: 7912177

Claim:
An X-ray radiographic method of recognition of materials in an inspected object, comprising: transmitting radiation through the inspected object in a plurality of different spectral ranges with different effective energy, wherein X-ray radiation used is quasimonochromatic, recording said radiation transmitted through the inspected object by spatially separated multi-element radiation receivers of selective sensitivity, upon each of which quasimonochromatic radiation of specified energy is directed, and recognizing the materials in the inspect object, according to the following method: pre-recording background signal values in the absence of the inspected object for each of said receivers under X-ray irradiation of specified energy, recording signal values obtained in X-raying of a set of test objects, normalizing the signals are normalized signal values obtained in X-raying the set of test objects with respect to said background signals to determine calibration constants, and recognizing the material by determining a radiographic reflex for the inspected object based on the recorded radiation normalized with respect to said background signals, and accounting for said calibration constants.