Electron Accelerators for Novel Cargo Inspection Methods

Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): S. Kutsaev, R. Agustsson, A. Arodzero, S. Boucher, J. Hartzell, A. Murokh, F. O'Shea, A.Yu. Smirnov One of the main factors limiting the performance of conventional x-ray cargo inspection with material discrimination (MD) is the interlaced mode of system operation. Such systems use pulsed linac or betatron x-ray generators and produce alternate bremsstrahlung pulses with lower- and higher- end-point energies. Consequently, these systems provide about 50mm lower penetration than a system operated in a non-interlaced mode, have a limited range of cargo areal densities with valid MD, and cannot perform MD of objects smaller than the pulse separation. Also, the limited pulse repetition rate of x-ray generators in interlaced mode limits the radiographic image quality at nominal commercial speeds of vehicles or trains. Several new methods of cargo inspection with MD were recently introduced to address the above-mentioned limitations: dual-energy methods based on Scintillation-Cherenkov detectors [1]; multi-energy method based on intrapulse time-varying of spectral content of x-ray [1,2]; multi-energy method utilized ramping-up energy packet of short x-ray pulses [3,4]; and methods based on multi-energy betatron [5,6]. All of these methods have electron accelerators as a core element. However, the accelerator requirements and, thus, their designs, are different for each system. In this paper, we will disc...

Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research