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Title: Experimental study of variations in background radiation and the effect on Nuclear Car Wash sensitivity

Abstract

Error rates in a cargo screening system such as the Nuclear Car Wash [1-7] depend on the standard deviation of the background radiation count rate. Because the Nuclear Car Wash is an active interrogation technique, the radiation signal for fissile material must be detected above a background count rate consisting of cosmic, ambient, and neutron-activated radiations. It was suggested previously [1,6] that the Corresponding negative repercussions for the sensitivity of the system were shown. Therefore, to assure the most accurate estimation of the variation, experiments have been performed to quantify components of the actual variance in the background count rate, including variations in generator power, irradiation time, and container contents. The background variance is determined by these experiments to be a factor of 2 smaller than values assumed in previous analyses, resulting in substantially improved projections of system performance for the Nuclear Car Wash.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
902608
Report Number(s):
UCRL-TR-229157
TRN: US0702979
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS AND PHYSICAL PROTECTION; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; AUTOMOBILES; BACKGROUND RADIATION; CARGO; CONTAINERS; FISSILE MATERIALS; IRRADIATION; PERFORMANCE; RADIATIONS; SENSITIVITY

Citation Formats

Church, J, Slaughter, D, Norman, E, Asztalos, S, and Biltoft, P. Experimental study of variations in background radiation and the effect on Nuclear Car Wash sensitivity. United States: N. p., 2007. Web. doi:10.2172/902608.
Church, J, Slaughter, D, Norman, E, Asztalos, S, & Biltoft, P. Experimental study of variations in background radiation and the effect on Nuclear Car Wash sensitivity. United States. doi:10.2172/902608.
Church, J, Slaughter, D, Norman, E, Asztalos, S, and Biltoft, P. Wed . "Experimental study of variations in background radiation and the effect on Nuclear Car Wash sensitivity". United States. doi:10.2172/902608. https://www.osti.gov/servlets/purl/902608.
@article{osti_902608,
title = {Experimental study of variations in background radiation and the effect on Nuclear Car Wash sensitivity},
author = {Church, J and Slaughter, D and Norman, E and Asztalos, S and Biltoft, P},
abstractNote = {Error rates in a cargo screening system such as the Nuclear Car Wash [1-7] depend on the standard deviation of the background radiation count rate. Because the Nuclear Car Wash is an active interrogation technique, the radiation signal for fissile material must be detected above a background count rate consisting of cosmic, ambient, and neutron-activated radiations. It was suggested previously [1,6] that the Corresponding negative repercussions for the sensitivity of the system were shown. Therefore, to assure the most accurate estimation of the variation, experiments have been performed to quantify components of the actual variance in the background count rate, including variations in generator power, irradiation time, and container contents. The background variance is determined by these experiments to be a factor of 2 smaller than values assumed in previous analyses, resulting in substantially improved projections of system performance for the Nuclear Car Wash.},
doi = {10.2172/902608},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 07 00:00:00 EST 2007},
month = {Wed Feb 07 00:00:00 EST 2007}
}

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