4 September 2014 A new pad-based neutron detector for stereo coded aperture thermal neutron imaging
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Abstract
A new coded aperture thermal neutron imager system has been developed at Brookhaven National Laboratory. The cameras use a new type of position-sensitive 3He-filled ionization chamber, in which an anode plane is composed of an array of pads with independent acquisition channels. The charge is collected on each of the individual 5x5 mm2 anode pads, (48x48 in total, corresponding to 24x24 cm2 sensitive area) and read out by application specific integrated circuits (ASICs). The new design has several advantages for coded-aperture imaging applications in the field, compared to the previous generation of wire-grid based neutron detectors. Among these are its rugged design, lighter weight and use of non-flammable stopping gas. The pad-based readout occurs in parallel circuits, making it capable of high count rates, and also suitable to perform data analysis and imaging on an event-by-event basis. The spatial resolution of the detector can be better than the pixel size by using a charge sharing algorithm. In this paper we will report on the development and performance of the new pad-based neutron camera, describe a charge sharing algorithm to achieve sub-pixel spatial resolution and present the first stereoscopic coded aperture images of thermalized neutron sources using the new coded aperture thermal neutron imager system.
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I. Dioszegi, I. Dioszegi, B. Yu, B. Yu, G. Smith, G. Smith, N. Schaknowski, N. Schaknowski, J. Fried, J. Fried, P. E. Vanier, P. E. Vanier, C. Salwen, C. Salwen, L. Forman, L. Forman, } "A new pad-based neutron detector for stereo coded aperture thermal neutron imaging", Proc. SPIE 9215, Radiation Detectors: Systems and Applications XV, 921502 (4 September 2014); doi: 10.1117/12.2061866; https://doi.org/10.1117/12.2061866
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