Radiological Source Term Estimation and Isotopic Identification with Parallel Log Domain Particle Filters

Kemp, Samuel; Duce, Mackenzie; Kumar, Satvik; Erickson, Anna; Rogers, Jonathan

doi:10.1109/tns.2024.3467003

Radiological Source Term Estimation and Isotopic Identification with Parallel Log Domain Particle Filters

Journal Article · Tue Sep 24 00:00:00 EDT 2024 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/tns.2024.3467003· OSTI ID:2475406

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Georgia Institute of Technology, Atlanta, GA (United States)

This paper presents a parallel log-domain particle filtering algorithm combined with gamma spectrum unfolding to perform localization, identification, and evaluation of multiple point sources of various isotopes in an environment with attenuating obstacles. The method uses sets of precomputed attenuation kernels that map the attenuation characteristics of the environment. These kernels are specific to the energy level of a photopeak of interest. The spectral measurements are deconvolved into count measurements of each photopeak. These count measurements are fed into a set of parallel particle filters using attenuation kernels computed for that photopeak’s energy level. The individual regularized particle filters perform all likelihood calculations in the logarithmic domain to mitigate the effects of particle degeneracy. The output of each particle filter is combined to estimate which isotopes are present as well as their positions and strengths. The performance of the algorithm is characterized in a lab-scale environment using a mobile robot equipped with a gamma ray spectrometer in the presence of up to three different radioactive isotopes simultaneously. The sources were localized to within 10 cm, and their strengths were estimated within 10% of their true values. Furthermore, the isotopes were all correctly identified, and no spurious sources were reported.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003921

OSTI ID:: 2475406

Journal Information:: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 11 Vol. 71; ISSN 0018-9499

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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