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 Laboratory (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)
- 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 = {Tue Mar 18 00:00:00 EDT 2014},
month = {Tue Mar 18 00:00:00 EDT 2014}
}
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