Inverse Fan-Beam X-ray Diffraction Imaging with Applications in Liquids Identification (eBook, PDF)
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The Inverse Fan-beam (IF) confi guration for X-ray Diffraction Imaging (XDI) and its capability of identifying liquid and amorphous substances for the purpose of explosive detection are described and investigated. Material specifi c information can be obtained by measuring x-ray diffraction profi-les from selected volume elements within inhomogeneous extended objects. This new technique can be used to fi ngerprint liquid explosives and may eliminate the inconvenience, uncertainty, and expense associated with monitoring liquids separately from hand luggage at airport checkpoints. Design concept...
The Inverse Fan-beam (IF) confi guration for X-ray Diffraction Imaging (XDI) and its capability of identifying liquid and amorphous substances for the purpose of explosive detection are described and investigated. Material specifi c information can be obtained by measuring x-ray diffraction profi-les from selected volume elements within inhomogeneous extended objects. This new technique can be used to fi ngerprint liquid explosives and may eliminate the inconvenience, uncertainty, and expense associated with monitoring liquids separately from hand luggage at airport checkpoints. Design concepts for multi-detector arrangements, a multidirectional primary collimator and the scatter imaging collimator are presented and evaluated using numerical procedures.
A computer program using ray-tracing methods is described for calculating the primary beam profi le, the scattering angle distribution, and the radiation effi ciency with respect to the x-ray collimation geometry. Synchrotron x-ray diffraction measurements were performed on various liquids which are of interest for security applications. The diffraction profi les are presented and the key features which are potentially suitable for the purpose of explosive detection identifi ed. Material specific information is obtained about the morphology and its effective atomic number.
Several additional parameters describing the structure and density of the object under investigation can be derived from the peaks in the molecular interference function.
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