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dc.contributor.advisorSmith, Craig F.
dc.contributor.authorBatteson, Bruce
dc.date.accessioned2019-11-04T18:20:23Z
dc.date.available2019-11-04T18:20:23Z
dc.date.issued2019-09
dc.identifier.urihttp://hdl.handle.net/10945/63506
dc.description.abstractFast neutron detection is critical to the interdiction of illicit special nuclear material, among other potential applications. The use of heavy oxide scintillators to detect fast neutrons is one technology requiring little to no moderation and enabling construction of highly efficient detectors. Previous work qualitatively describes various physical modes of neutron interaction in these materials. This work simulates the interaction of neutrons in heavy oxide materials in order to quantify the contribution of each physical mode to the overall detection signal and to evaluate the chain of reactions from incident neutron to optical photon production and transport. Such quantization may enable optimization of detector design and greater fidelity in detector response. Using GEANT4 in conjunction with Lawrence Livermore National Laboratory’s LEND physics list, we simulated the response of Bismuth Germanate (Bi4Ge3O12 or BGO) to incident neutrons. We validated the simulation by comparison to known data and laboratory experimental results. Optical photon production was generally a result of complex and highly varied series of particle interactions. Although we identified hundreds of unique photon production channels in BGO, relatively few such channels played a significant role in optical photon production. We observed that 90% of photon production was through a channel that started with an initial neutron elastic or inelastic scattering event.Fast neutron detection is critical to the interdiction of illicit special nuclear material, among other potential applications. The use of heavy oxide scintillators to detect fast neutrons is one technology requiring little to no moderation and enabling construction of highly efficient detectors. Previous work qualitatively describes various physical modes of neutron interaction in these materials. This work simulates the interaction of neutrons in heavy oxide materials in order to quantify the contribution of each physical mode to the overall detection signal and to evaluate the chain of reactions from incident neutron to optical photon production and transport. Such quantization may enable optimization of detector design and greater fidelity in detector response. Using GEANT4 in conjunction with Lawrence Livermore National Laboratory’s LEND physics list, we simulated the response of Bismuth Germanate (Bi4Ge3O12 or BGO) to incident neutrons. We validated the simulation by comparison to known data and laboratory experimental results. Optical photon production was generally a result of complex and highly varied series of particle interactions. Although we identified hundreds of unique photon production channels in BGO, relatively few such channels played a significant role in optical photon production. We observed that 90% of photon production was through a channel that started with an initial neutron elastic or inelastic scattering event.Fast neutron detection is critical to the interdiction of illicit special nuclear material, among other potential applications. The use of heavy oxide scintillators to detect fast neutrons is one technology requiring little to no moderation and enabling construction of highly efficient detectors. Previous work qualitatively describes various physical modes of neutron interaction in these materials. This work simulates the interaction of neutrons in heavy oxide materials in order to quantify the contribution of each physical mode to the overall detection signal and to evaluate the chain of reactions from incident neutron to optical photon production and transport. Such quantization may enable optimization of detector design and greater fidelity in detector response. Using GEANT4 in conjunction with Lawrence Livermore National Laboratory’s LEND physics list, we simulated the response of Bismuth Germanate (Bi4Ge3O12 or BGO) to incident neutrons. We validated the simulation by comparison to known data and laboratory experimental results. Optical photon production was generally a result of complex and highly varied series of particle interactions. Although we identified hundreds of unique photon production channels in BGO, relatively few such channels played a significant role in optical photon production. We observed that 90% of photon production was through a channel that started with an initial neutron elastic or inelastic scattering event.Fast neutron detection is critical to the interdiction of illicit special nuclear material, among other potential applications. The use of heavy oxide scintillators to detect fast neutrons is one technology requiring little to no moderation and enabling construction of highly efficient detectors. Previous work qualitatively describes various physical modes of neutron interaction in these materials. This work simulates the interaction of neutrons in heavy oxide materials in order to quantify the contribution of each physical mode to the overall detection signal and to evaluate the chain of reactions from incident neutron to optical photon production and transport. Such quantization may enable optimization of detector design and greater fidelity in detector response. Using GEANT4 in conjunction with Lawrence Livermore National Laboratory’s LEND physics list, we simulated the response of Bismuth Germanate (Bi4Ge3O12 or BGO) to incident neutrons. We validated the simulation by comparison to known data and laboratory experimental results. Optical photon production was generally a result of complex and highly varied series of particle interactions. Although we identified hundreds of unique photon production channels in BGO, relatively few such channels played a significant role in optical photon production. We observed that 90% of photon production was through a channel that started with an initial neutron elastic or inelastic scattering event.Fast neutron detection is critical to the interdiction of illicit special nuclear material, among other potential applications. The use of heavy oxide scintillators to detect fast neutrons is one technology requiring little to no moderation and enabling construction of highly efficient detectors. Previous work qualitatively describes various physical modes of neutron interaction in these materials. This work simulates the interaction of neutrons in heavy oxide materials in order to quantify the contribution of each physical mode to the overall detection signal and to evaluate the chain of reactions from incident neutron to optical photon production and transport. Such quantization may enable optimization of detector design and greater fidelity in detector response. Using GEANT4 in conjunction with Lawrence Livermore National Laboratory’s LEND physics list, we simulated the response of Bismuth Germanate (Bi4Ge3O12 or BGO) to incident neutrons. We validated the simulation by comparison to known data and laboratory experimental results. Optical photon production was generally a result of complex and highly varied series of particle interactions. Although we identified hundreds of unique photon production channels in BGO, relatively few such channels played a significant role in optical photon production. We observed that 90% of photon production was through a channel that started with an initial neutron elastic or inelastic scattering event.Fast neutron detection is critical to the interdiction of illicit special nuclear material, among other potential applications. The use of heavy oxide scintillators to detect fast neutrons is one technology requiring little to no moderation and enabling construction of highly efficient detectors. Previous work qualitatively describes various physical modes of neutron interaction in these materials. This work simulates the interaction of neutrons in heavy oxide materials in order to quantify the contribution of each physical mode to the overall detection signal and to evaluate the chain of reactions from incident neutron to optical photon production and transport. Such quantization may enable optimization of detector design and greater fidelity in detector response. Using GEANT4 in conjunction with Lawrence Livermore National Laboratory’s LEND physics list, we simulated the response of Bismuth Germanate (Bi4Ge3O12 or BGO) to incident neutrons. We validated the simulation by comparison to known data and laboratory experimental results. Optical photon production was generally a result of complex and highly varied series of particle interactions. Although we identified hundreds of unique photon production channels in BGO, relatively few such channels played a significant role in optical photon production. We observed that 90% of photon production was through a channel that started with an initial neutron elastic or inelastic scattering event.en_US
dc.description.sponsorshipRD-NT (NSERC), DTRAen_US
dc.description.urihttp://archive.org/details/geantsimulationo1094563506
dc.publisherMonterey, CA; Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleGEANT4 SIMULATION OF FAST NEUTRON INTERACTIONS IN HEAVY OXIDE SCINTILLATORSen_US
dc.typeThesisen_US
dc.contributor.secondreaderGrbovic, Dragoslav
dc.contributor.departmentPhysics (PH)
dc.subject.authorfast neutron detectionen_US
dc.subject.authorinelastic neutron scatteringen_US
dc.subject.authorresonant neutron captureen_US
dc.subject.authorheavy oxide scintillatoren_US
dc.subject.authorbismuth germanateen_US
dc.subject.authorBi4Ge3O12en_US
dc.subject.authorBGOen_US
dc.subject.authorGEANT4 simulation toolkiten_US
dc.subject.authorG4OpticalPhysicsen_US
dc.subject.authorLENDen_US
dc.description.serviceLieutenant Commander, United States Navyen_US
etd.thesisdegree.nameMaster of Science in Physicsen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplinePhysicsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.identifier.thesisid32368
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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