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Proceedings Paper

Utilization of advanced clutter suppression algorithms for improved standoff detection and identification of radionuclide threats
Author(s): Bogdan R. Cosofret; Kirill Shokhirev; Phil Mulhall; David Payne; Bernard Harris
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Paper Abstract

Technology development efforts seek to increase the capability of detection systems in low Signal-to-Noise regimes encountered in both portal and urban detection applications. We have recently demonstrated significant performance enhancement in existing Advanced Spectroscopic Portals (ASP), Standoff Radiation Detection Systems (SORDS) and handheld isotope identifiers through the use of new advanced detection and identification algorithms. The Poisson Clutter Split (PCS) algorithm is a novel approach for radiological background estimation that improves the detection and discrimination capability of medium resolution detectors. The algorithm processes energy spectra and performs clutter suppression, yielding de-noised gamma-ray spectra that enable significant enhancements in detection and identification of low activity threats with spectral target recognition algorithms. The performance is achievable at the short integration times (0.5 – 1 second) necessary for operation in a high throughput and dynamic environment. PCS has been integrated with ASP, SORDS and RIID units and evaluated in field trials. We present a quantitative analysis of algorithm performance against data collected by a range of systems in several cluttered environments (urban and containerized) with embedded check sources. We show that the algorithm achieves a high probability of detection/identification with low false alarm rates under low SNR regimes. For example, utilizing only 4 out of 12 NaI detectors currently available within an ASP unit, PCS processing demonstrated Pd,ID > 90% at a CFAR (Constant False Alarm Rate) of 1 in 1000 occupancies against weak activity (7 - 8μCi) and shielded sources traveling through the portal at 30 mph. This vehicle speed is a factor of 6 higher than was previously possible and results in significant increase in system throughput and overall performance.

Paper Details

Date Published: 29 May 2014
PDF: 13 pages
Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 907316 (29 May 2014); doi: 10.1117/12.2049831
Show Author Affiliations
Bogdan R. Cosofret, Physical Sciences Inc. (United States)
Kirill Shokhirev, Physical Sciences Inc. (United States)
Phil Mulhall, Physical Sciences Inc. (United States)
David Payne, Raytheon Integrated Defense Systems (United States)
Bernard Harris, Raytheon Integrated Defense Systems (United States)


Published in SPIE Proceedings Vol. 9073:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV
Augustus Way Fountain, Editor(s)

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