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Title: Physics-based, Bayesian sequential detection method and system for radioactive contraband

Abstract

A distributed sequential method and system for detecting and identifying radioactive contraband from highly uncertain (noisy) low-count, radionuclide measurements, i.e. an event mode sequence (EMS), using a statistical approach based on Bayesian inference and physics-model-based signal processing based on the representation of a radionuclide as a monoenergetic decomposition of monoenergetic sources. For a given photon event of the EMS, the appropriate monoenergy processing channel is determined using a confidence interval condition-based discriminator for the energy amplitude and interarrival time and parameter estimates are used to update a measured probability density function estimate for a target radionuclide. A sequential likelihood ratio test is then used to determine one of two threshold conditions signifying that the EMS is either identified as the target radionuclide or not, and if not, then repeating the process for the next sequential photon event of the EMS until one of the two threshold conditions is satisfied.

Inventors:
; ; ; ; ; ; ;
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1127092
Patent Number(s):
8676744
Application Number:
12/259,198
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA)
Patent Classifications (CPCs):
G - PHYSICS G06 - COMPUTING G06N - COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Candy, James V, Axelrod, Michael C, Breitfeller, Eric F, Chambers, David H, Guidry, Brian L, Manatt, Douglas R, Meyer, Alan W, and Sale, Kenneth E. Physics-based, Bayesian sequential detection method and system for radioactive contraband. United States: N. p., 2014. Web.
Candy, James V, Axelrod, Michael C, Breitfeller, Eric F, Chambers, David H, Guidry, Brian L, Manatt, Douglas R, Meyer, Alan W, & Sale, Kenneth E. Physics-based, Bayesian sequential detection method and system for radioactive contraband. United States.
Candy, James V, Axelrod, Michael C, Breitfeller, Eric F, Chambers, David H, Guidry, Brian L, Manatt, Douglas R, Meyer, Alan W, and Sale, Kenneth E. Tue . "Physics-based, Bayesian sequential detection method and system for radioactive contraband". United States. https://www.osti.gov/servlets/purl/1127092.
@article{osti_1127092,
title = {Physics-based, Bayesian sequential detection method and system for radioactive contraband},
author = {Candy, James V and Axelrod, Michael C and Breitfeller, Eric F and Chambers, David H and Guidry, Brian L and Manatt, Douglas R and Meyer, Alan W and Sale, Kenneth E},
abstractNote = {A distributed sequential method and system for detecting and identifying radioactive contraband from highly uncertain (noisy) low-count, radionuclide measurements, i.e. an event mode sequence (EMS), using a statistical approach based on Bayesian inference and physics-model-based signal processing based on the representation of a radionuclide as a monoenergetic decomposition of monoenergetic sources. For a given photon event of the EMS, the appropriate monoenergy processing channel is determined using a confidence interval condition-based discriminator for the energy amplitude and interarrival time and parameter estimates are used to update a measured probability density function estimate for a target radionuclide. A sequential likelihood ratio test is then used to determine one of two threshold conditions signifying that the EMS is either identified as the target radionuclide or not, and if not, then repeating the process for the next sequential photon event of the EMS until one of the two threshold conditions is satisfied.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {3}
}

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