Stochastic image reconstruction for a dual-particle imaging system

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 810; no. C
• Main Authors: Hamel, M. C., Polack, J. K., Poitrasson-Rivière, A., Flaska, M., Clarke, S. D., Pozzi, S. A., Tomanin, Alice, Peerani, P.
• Format: Journal Article
• Language: English
• Published: United States Elsevier 10.12.2015
• Subjects: Compton imaging; Image Reconstruction; Neutron imaging; NUCLEAR PHYSICS AND RADIATION PHYSICS; Radiation detection; Radiation Imaging
• ISSN: 0168-9002; 1872-9576

Stochastic image reconstruction has been applied to a dual-particle imaging system being designed for nuclear safeguards applications. The dual-particle imager (DPI) is a combined Compton-scatter and neutron-scatter camera capable of producing separate neutron and photon images. The stochastic origin ensembles (SOE) method was investigated as an imaging method for the DPI because only a minimal estimation of system response is required to produce images with quality that is comparable to common maximum-likelihood methods. Here, this work contains neutron and photon SOE image reconstructions for a 252Cf point source, two mixed-oxide (MOX) fuel canisters representing point sources, and the MOX fuel canisters representing a distributed source. Simulation of the DPI using MCNPX-PoliMi is validated by comparison of simulated and measured results. Because image quality is dependent on the number of counts and iterations used, the relationship between these quantities is investigated.