The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 2014
Filed:
Oct. 27, 2008
James V. Candy, Danville, CA (US);
Michael C. Axelrod, San Ramon, CA (US);
Eric F. Breitfeller, Dublin, CA (US);
David H. Chambers, Livermore, CA (US);
Brian L. Guidry, Livermore, CA (US);
Douglas R. Manatt, Livermore, CA (US);
Alan W. Meyer, Danville, CA (US);
Kenneth E. Sale, Castro Valley, CA (US);
James V. Candy, Danville, CA (US);
Michael C. Axelrod, San Ramon, CA (US);
Eric F. Breitfeller, Dublin, CA (US);
David H. Chambers, Livermore, CA (US);
Brian L. Guidry, Livermore, CA (US);
Douglas R. Manatt, Livermore, CA (US);
Alan W. Meyer, Danville, CA (US);
Kenneth E. Sale, Castro Valley, CA (US);
Lawrence Livermore National Security, LLC, Livermore, CA (US);
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.