FEASIBILITY STUDY OF X-RAY DIFFRACTION FOR THE "SPIDERS" PORTABLE INSPECTION SYSTEM
Résumé
The aim of the "SPIDERS" project is the validation of a novel portable imaging system for the characterization of dangerous/illicit materials inside objects. The system combines two X-ray techniques: the dual-energy tomosynthesis and the energy-dispersive diffraction. The latter has been chosen for its utility in the detection of narcotics and a wide range of explosives as pointed out elsewhere. The main goal is the 3D object exploration without imposing any movements to the object. In the diffraction modality, measurements are performed by translating the diffracted beam collimator and the detector. The latter is based on CdZnTe semiconductors, which can provide energy resolution (DE/E) of about 3% @ 90 keV and room temperature. We report here the optimization study for the system specifications in the diffraction modality. In order to select the experimental conditions (the kV of X-ray sources, the "diffraction" angle q, the angular resolution Dq/q, the collimator design, ...) best suited for the system purposes, a multi-parametric simulation study has been performed.