A dual-sided coded-aperture radiation detection system

R. D. Penny; W. E. Hood; R. M. Polichar; F. H. Cardone; L. G. Chavez; S. G. Grubbs; B. P. Huntley; R. A. Kuharski; R. T. Shyffer; L. Fabris; K. P. Ziock; S. E. Labov; K. Nelson

doi:10.1016/j.nima.2011.01.161

A dual-sided coded-aperture radiation detection system

R. D. Penny, W. E. Hood, R. M. Polichar, F. H. Cardone, L. G. Chavez, S. G. Grubbs, B. P. Huntley, R. A. Kuharski, R. T. Shyffer, L. Fabris, K. P. Ziock, S. E. Labov, K. Nelson

Radiation Imaging and Advanced Diagnosti

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

We report the development of a large-area, mobile, coded-aperture radiation imaging system for localizing compact radioactive sources in three dimensions while rejecting distributed background. The 3D Stand-Off Radiation Detection System (SORDS-3D) has been tested at speeds up to 95 km/h and has detected and located sources in the millicurie range at distances of over 100 m. Radiation data are imaged to a geospatially mapped world grid with a nominal 1.25- to 2.5-m pixel pitch at distances out to 120 m on either side of the platform. Source elevation is also extracted. Imaged radiation alarms are superimposed on a side-facing video log that can be played back for direct localization of sources in buildings in urban environments. The system utilizes a 37-element array of 5×5×50 cm³ cesium-iodide (sodium) detectors. Scintillation light is collected by a pair of photomultiplier tubes placed at either end of each detector, with the detectors achieving an energy resolution of 6.15% FWHM (662 keV) and a position resolution along their length of 5 cm FWHM. The imaging system generates a dual-sided two-dimensional image allowing users to efficiently survey a large area. Imaged radiation data and raw spectra are forwarded to the RadioNuclide Analysis Kit (RNAK), developed by our collaborators, for isotope ID. An intuitive real-time display aids users in performing searches. Detector calibration is dynamically maintained by monitoring the potassium-40 peak and digitally adjusting individual detector gains. We have recently realized improvements, both in isotope identification and in distinguishing compact sources from background, through the installation of optimal-filter reconstruction kernels.

Original language	English
Pages (from-to)	578-581
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	652
Issue number	1
DOIs	https://doi.org/10.1016/j.nima.2011.01.161
State	Published - Oct 1 2011

Funding

This work was funded by the U.S. Department of Homeland Security Domestic Nuclear Detection Office .

Keywords

Coded-aperture imaging
Radiation imaging systems
Standoff radiation detection

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10.1016/j.nima.2011.01.161

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Penny, R. D., Hood, W. E., Polichar, R. M., Cardone, F. H., Chavez, L. G., Grubbs, S. G., Huntley, B. P., Kuharski, R. A., Shyffer, R. T., Fabris, L., Ziock, K. P., Labov, S. E., & Nelson, K. (2011). A dual-sided coded-aperture radiation detection system. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 652(1), 578-581. https://doi.org/10.1016/j.nima.2011.01.161

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Penny, RD, Hood, WE, Polichar, RM, Cardone, FH, Chavez, LG, Grubbs, SG, Huntley, BP, Kuharski, RA, Shyffer, RT, Fabris, L, Ziock, KP, Labov, SE & Nelson, K 2011, 'A dual-sided coded-aperture radiation detection system', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 652, no. 1, pp. 578-581. https://doi.org/10.1016/j.nima.2011.01.161

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AU - Grubbs, S. G.

AU - Huntley, B. P.

AU - Kuharski, R. A.

AU - Shyffer, R. T.

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A dual-sided coded-aperture radiation detection system

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