Monte Carlo modeling of a FDS/OSL spectrometer and reconstruction of laser-based bremsstrahlung source spectrum with Bayesian unfolding algorithm
Résumé
Detection technologies have long played an important role in customs border checks, by making it easier to detect dutiable, prohibited/controlled goods and materials. X-ray Computed Tomography (CT) is widely used by online inspection portals. Current CT techniques rely upon the use of LINear ACcelerators (LINACs) as X-ray source. However, they still lead to inconclusive or even faulty results, partly due to loading complexity or to the sophistication of smuggling methods. With the aim of improving the inspection of large dimension cargo, the European Commission has funded the Horizon 2020 European Project MULTISCAN 3D. The objective is to design and test an innovative 3D high-energy CT system capable of illicit material detection, relying upon the use of laser-plasma based X-ray sources as substitutes to LINACs. An intense femtosecond (fs) laser beam is focused onto a gas jet, thus generating a plasma and contributing to accelerate free electrons. High-energy electrons (tens of MeV) eventually hit a tungsten target, producing Bremsstrahlung X-rays emission. The control of this new source technology and associated instrumentation is therefore a real technological breakthrough. It would allow a greater number of point sources to be used leading to improved 3D resolution in CT images while optimizing both cost and compactness issues.
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