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Title: Foundations for Improvements to Passive Detection Systems - Final Report

Abstract

This project explores the scientific foundation and approach for improving passive detection systems for plutonium and highly enriched uranium in real applications. Sources of gamma-ray radiation of interest were chosen to represent a range of national security threats, naturally occurring radioactive materials, industrial and medical radiation sources, and natural background radiation. The gamma-ray flux emerging from these sources, which include unclassified criticality experiment configurations as surrogates for nuclear weapons, were modeled in detail. The performance of several types of gamma-ray imaging systems using Compton scattering were modeled and compared. A mechanism was created to model the combine sources and background emissions and have the simulated radiation ''scene'' impinge on a model of a detector. These modeling tools are now being used in various projects to optimize detector performance and model detector sensitivity in complex measuring environments. This study also developed several automated algorithms for isotope identification from gamma-ray spectra and compared these to each other and to algorithms already in use. Verification testing indicates that these alternative isotope identification algorithms produced less false positive and false negative results than the ''GADRAS'' algorithms currently in use. In addition to these algorithms that used binned spectra, a new approach to isotope identificationmore » using ''event mode'' analysis was developed. Finally, a technique using muons to detect nuclear material was explored.« less

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Lab., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15011571
Report Number(s):
UCRL-TR-207129
TRN: US0501331
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 7 Oct 2004
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ALGORITHMS; BACKGROUND RADIATION; COMPTON EFFECT; CRITICALITY; DETECTION; HIGHLY ENRICHED URANIUM; MUONS; NATIONAL SECURITY; NUCLEAR WEAPONS; PLUTONIUM; RADIATION SOURCES; RADIATIONS; RADIOACTIVE MATERIALS; SENSITIVITY; SIMULATION; SPECTRA; VERIFICATION

Citation Formats

Labov, S E, Pleasance, L, Sokkappa, P, Craig, W, Chapline, G, Frank, M, Gronberg, J, Jernigan, J G, Johnson, S, Kammeraad, J, Lange, D, Meyer, A, Nelson, K, Pohl, B, Wright, D, and Wurtz, R. Foundations for Improvements to Passive Detection Systems - Final Report. United States: N. p., 2004. Web. doi:10.2172/15011571.
Labov, S E, Pleasance, L, Sokkappa, P, Craig, W, Chapline, G, Frank, M, Gronberg, J, Jernigan, J G, Johnson, S, Kammeraad, J, Lange, D, Meyer, A, Nelson, K, Pohl, B, Wright, D, & Wurtz, R. Foundations for Improvements to Passive Detection Systems - Final Report. United States. doi:10.2172/15011571.
Labov, S E, Pleasance, L, Sokkappa, P, Craig, W, Chapline, G, Frank, M, Gronberg, J, Jernigan, J G, Johnson, S, Kammeraad, J, Lange, D, Meyer, A, Nelson, K, Pohl, B, Wright, D, and Wurtz, R. Thu . "Foundations for Improvements to Passive Detection Systems - Final Report". United States. doi:10.2172/15011571. https://www.osti.gov/servlets/purl/15011571.
@article{osti_15011571,
title = {Foundations for Improvements to Passive Detection Systems - Final Report},
author = {Labov, S E and Pleasance, L and Sokkappa, P and Craig, W and Chapline, G and Frank, M and Gronberg, J and Jernigan, J G and Johnson, S and Kammeraad, J and Lange, D and Meyer, A and Nelson, K and Pohl, B and Wright, D and Wurtz, R},
abstractNote = {This project explores the scientific foundation and approach for improving passive detection systems for plutonium and highly enriched uranium in real applications. Sources of gamma-ray radiation of interest were chosen to represent a range of national security threats, naturally occurring radioactive materials, industrial and medical radiation sources, and natural background radiation. The gamma-ray flux emerging from these sources, which include unclassified criticality experiment configurations as surrogates for nuclear weapons, were modeled in detail. The performance of several types of gamma-ray imaging systems using Compton scattering were modeled and compared. A mechanism was created to model the combine sources and background emissions and have the simulated radiation ''scene'' impinge on a model of a detector. These modeling tools are now being used in various projects to optimize detector performance and model detector sensitivity in complex measuring environments. This study also developed several automated algorithms for isotope identification from gamma-ray spectra and compared these to each other and to algorithms already in use. Verification testing indicates that these alternative isotope identification algorithms produced less false positive and false negative results than the ''GADRAS'' algorithms currently in use. In addition to these algorithms that used binned spectra, a new approach to isotope identification using ''event mode'' analysis was developed. Finally, a technique using muons to detect nuclear material was explored.},
doi = {10.2172/15011571},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Oct 07 00:00:00 EDT 2004},
month = {Thu Oct 07 00:00:00 EDT 2004}
}

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