Fast neutron scattering analysis

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dc.contributor.advisorBrooks, F Den_ZA
dc.contributor.advisorAschman, David Gen_ZA
dc.contributor.authorBuffler, Andyen_ZA
dc.date.accessioned2016-02-18T12:24:39Z
dc.date.available2016-02-18T12:24:39Z
dc.date.issued1998en_ZA
dc.descriptionBibliography: pages 217-225.en_ZA
dc.description.abstractThe scattering of a beam of fast monoenergetic neutrons is used to determine elemental compositions of small (0.2-1 kg) samples of materials. Particular emphasis is placed on the measurement of concentrations of the elements H, C, N and O, which are the principal constituents of contraband materials, such as explosives and narcotics. Scattered neutrons are detected by liquid scintillators located at forward and at backward angles, and different elements are identified by their characteristic scattering signatures derived either from a combination of time-of-flight and pulse height measurements or from pulse height measurements alone. Atom fractions for H, C, N, O and other elements are derived from unfolding analyses based on these scattering signatures and used to identify materials. Effects of neutron interactions in surrounding materials, either in the neutron beam or between the scatterer and the detectors, can be detected and allowed for in such a way as not to interfere significantly in the identification of the scatterer. The Fast Neutron Scattering Analysis technique provides a non- intrusive method for detecting and identifying sub-kilogram quantities of contraband materials. Methods for locating the positions of small contraband items in packages of volume up to about 0.5m³ are described and a two-stage screening system for detecting contraband hidden in small packages is proposed.en_ZA
dc.identifier.apacitationBuffler, A. (1998). <i>Fast neutron scattering analysis</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/17137en_ZA
dc.identifier.chicagocitationBuffler, Andy. <i>"Fast neutron scattering analysis."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 1998. http://hdl.handle.net/11427/17137en_ZA
dc.identifier.citationBuffler, A. 1998. Fast neutron scattering analysis. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Buffler, Andy AB - The scattering of a beam of fast monoenergetic neutrons is used to determine elemental compositions of small (0.2-1 kg) samples of materials. Particular emphasis is placed on the measurement of concentrations of the elements H, C, N and O, which are the principal constituents of contraband materials, such as explosives and narcotics. Scattered neutrons are detected by liquid scintillators located at forward and at backward angles, and different elements are identified by their characteristic scattering signatures derived either from a combination of time-of-flight and pulse height measurements or from pulse height measurements alone. Atom fractions for H, C, N, O and other elements are derived from unfolding analyses based on these scattering signatures and used to identify materials. Effects of neutron interactions in surrounding materials, either in the neutron beam or between the scatterer and the detectors, can be detected and allowed for in such a way as not to interfere significantly in the identification of the scatterer. The Fast Neutron Scattering Analysis technique provides a non- intrusive method for detecting and identifying sub-kilogram quantities of contraband materials. Methods for locating the positions of small contraband items in packages of volume up to about 0.5m³ are described and a two-stage screening system for detecting contraband hidden in small packages is proposed. DA - 1998 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1998 T1 - Fast neutron scattering analysis TI - Fast neutron scattering analysis UR - http://hdl.handle.net/11427/17137 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17137
dc.identifier.vancouvercitationBuffler A. Fast neutron scattering analysis. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 1998 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17137en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherPhysicsen_ZA
dc.titleFast neutron scattering analysisen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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