Abstract
The advantages of Rayleigh scatter techniques over conventional X-ray methods for the detection of low- Z materials within a low- Z matrix have been demonstrated. Radiographs obtained by normal transmission methods and by a Rayleigh scattering technique have been recorded for several representative test objects and the resulting contrasts compared. Materials which are indistinguishable in the transmission images become apparent in the scatter images simply by taking the measurement at an appropriate scatter angle determined by the X-ray diffraction pattern of the material of interest. Inclusions which are undetectable in the transmission radiographs have been identified with contrasts of up to 28% which may be further increased with simple contrast enhancement procedures. This techniques has applications in any system that currently uses conventional transmission radiography, such as on line security screening or quality control monitoring, and may in principle be used in tandem which such a system.
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