An x-ray diffraction-based scanning method and system are described. The method includes screening for a particular substance in a container at a transportation center using a flat panel detector having a photoconductor x-ray conversion layer to detect x-rays diffracted by a particular substance in the...http://www.google.com/patents/US20040174959?utm_source=gb-gplus-sharePatent US20040174959 - X-ray diffraction-based scanning system
