Concept of a novel fast neutron imaging detector based on THGEM for fan-beam tomography applications

• Published in: Journal of instrumentation 2012-02, Vol.7 (2), p.C02056-C02056
• Main Authors: Cortesi, M, Zboray, R, Adams, R, Dangendorf, V, Prasser, H -M
• Format: Article
• Language: English
• Subjects: Detectors; Dynamical systems; Dynamics; Fast neutrons; Feasibility studies; Imaging; Mathematical models; Tomography
• ISSN: 1748-0221; 1748-0221
• DOI: 10.1088/1748-0221/7/02/C02056

The conceptual design and operational principle of a novel high-efficiency, fast neutron imaging detector based on THGEM, intended for future fan-beam transmission tomography applications, is described. We report on a feasibility study based on theoretical modeling and computer simulations of a possible detector configuration prototype. In particular we discuss results regarding the optimization of detector geometry, estimation of its general performance, and expected imaging quality: it has been estimated that detection efficiency of around 5-8% can be achieved for 2.5 MeV neutrons; spatial resolution is around one millimeter with no substantial degradation due to scattering effects. The foreseen applications of the imaging system are neutron tomography in non-destructive testing for the nuclear energy industry, including examination of spent nuclear fuel bundles, detection of explosives or drugs, as well as investigation of thermal hydraulics phenomena (e.g., two-phase flow, heat transfer, phase change, coolant dynamics, and liquid metal flow).