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Title: Simulation Of A Photofission-Based Cargo Interrogation System

Abstract

A comprehensive model has been developed to characterize and optimize the detection of Bremsstrahlung x-ray induced fission signatures from nuclear materials hidden in cargo containers. An effective active interrogation system should not only induce a large number of fission events but also efficiently detect their signatures. The proposed scanning system utilizes a 9-MV commercially available linear accelerator and the detection of strong fission signals i.e. delayed gamma rays and prompt neutrons. Because the scanning system is complex and the cargo containers are large and often highly attenuating, the simulation method segments the model into several physical steps, representing each change of radiation particle. Each approximation is carried-out separately, resulting in a major reduction in computational time and a significant improvement in tally statistics. The model investigates the effect on the fission rate and detection rate by various cargo types, densities and distributions. Hydrogenous and metallic cargos, homogeneous and heterogeneous, as well as various locations of the nuclear material inside the cargo container were studied. We will show that for the photofission-based interrogation system simulation, the final results are not only in good agreement with a full, single-step simulation but also with experimental results, further validating the full-system simulation.

Authors:
; ; ;  [1]
  1. Rapiscan Laboratories, Inc., 520 Almanor Avenue, Sunnyvale, CA 94085 (United States)
Publication Date:
OSTI Identifier:
21513450
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1336; Journal Issue: 1; Conference: CAARI 2010: 21. International Conference on the Application of Accelerators in Research and Industry, Fort Worth, TX (United States), 8-13 Aug 2010; Other Information: DOI: 10.1063/1.3586193; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; 43 PARTICLE ACCELERATORS; APPROXIMATIONS; BREMSSTRAHLUNG; CARGO; CONTAINERS; DENSITY; DETECTION; DISTRIBUTION; GAMMA RADIATION; LINEAR ACCELERATORS; MONTE CARLO METHOD; NEUTRON SOURCES; PARTICLES; PHOTOFISSION; PROMPT NEUTRONS; SIMULATION; X RADIATION; ACCELERATORS; BARYONS; CALCULATION METHODS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FERMIONS; FISSION; FISSION NEUTRONS; HADRONS; IONIZING RADIATIONS; NEUTRONS; NUCLEAR REACTIONS; NUCLEONS; PARTICLE SOURCES; PHOTONUCLEAR REACTIONS; PHYSICAL PROPERTIES; RADIATION SOURCES; RADIATIONS

Citation Formats

King, Michael, Gozani, Tsahi, Stevenson, John, and Shaw, Timothy. Simulation Of A Photofission-Based Cargo Interrogation System. United States: N. p., 2011. Web. doi:10.1063/1.3586193.
King, Michael, Gozani, Tsahi, Stevenson, John, & Shaw, Timothy. Simulation Of A Photofission-Based Cargo Interrogation System. United States. doi:10.1063/1.3586193.
King, Michael, Gozani, Tsahi, Stevenson, John, and Shaw, Timothy. Wed . "Simulation Of A Photofission-Based Cargo Interrogation System". United States. doi:10.1063/1.3586193.
@article{osti_21513450,
title = {Simulation Of A Photofission-Based Cargo Interrogation System},
author = {King, Michael and Gozani, Tsahi and Stevenson, John and Shaw, Timothy},
abstractNote = {A comprehensive model has been developed to characterize and optimize the detection of Bremsstrahlung x-ray induced fission signatures from nuclear materials hidden in cargo containers. An effective active interrogation system should not only induce a large number of fission events but also efficiently detect their signatures. The proposed scanning system utilizes a 9-MV commercially available linear accelerator and the detection of strong fission signals i.e. delayed gamma rays and prompt neutrons. Because the scanning system is complex and the cargo containers are large and often highly attenuating, the simulation method segments the model into several physical steps, representing each change of radiation particle. Each approximation is carried-out separately, resulting in a major reduction in computational time and a significant improvement in tally statistics. The model investigates the effect on the fission rate and detection rate by various cargo types, densities and distributions. Hydrogenous and metallic cargos, homogeneous and heterogeneous, as well as various locations of the nuclear material inside the cargo container were studied. We will show that for the photofission-based interrogation system simulation, the final results are not only in good agreement with a full, single-step simulation but also with experimental results, further validating the full-system simulation.},
doi = {10.1063/1.3586193},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1336,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 2011},
month = {Wed Jun 01 00:00:00 EDT 2011}
}