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Proceedings Paper

SmartID: a highly accurate physics-based isotope attribution algorithm
Author(s): M. J. Harrison; G. E. Sjoden; R. Detwiler
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Paper Abstract

The spectral post-processing algorithm Advanced Synthetically Enhanced Detector Resolution Algorithm (ASEDRA (patent pending)) has shown to be a powerful tool for deconvolving full energy peaks from scintillation spectrometeracquired gamma-ray spectra, effectively improving obtainable data-synthesized energy resolutions by a factor of four to six times over what is rendered from the detector. An isotope attribution algorithm, SmartID, was developed to augment ASEDRA in order to improve radionuclide identification accuracy. SmartID utilizes a novel, physics-based method of importance weighting the ASEDRA-identified peaks and the emissions of a candidate isotope. This methodology enhances the screening of potential false peaks and prevents isotope mismatches. As a final step, SmartID assigns a physical matching attribution score to each possible isotope match to reflect goodness-of-fit. A test suite of 105 gammaray spectra acquired with a 2"×2" NaI:Tl spectrometer under varying shielding conditions and various single and multisource configurations were recorded for testing the accuracy of ASEDRA+SmartID. The sources utilized in the tests included 133Ba, 109Cd, 57Co, 60Co, 137Cs, 152Eu, 54Mn, 22Na, 232Th, natural uranium rods and a PuBe source. Shielding configurations varied widely, ranging from none to more than 2.5cm Pb. Overall, SmartID proved to be more than 95% accurate in attributing the correct isotope(s) to the spectra.

Paper Details

Date Published: 5 May 2010
PDF: 10 pages
Proc. SPIE 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI, 76651M (5 May 2010); doi: 10.1117/12.850904
Show Author Affiliations
M. J. Harrison, Univ. of Florida (United States)
G. E. Sjoden, Univ. of Florida (United States)
R. Detwiler, Univ. of Florida (United States)

Published in SPIE Proceedings Vol. 7665:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI
Augustus Way Fountain III; Patrick J. Gardner, Editor(s)

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