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dc.contributor.advisorHaegel, Nancy M.
dc.contributor.authorSeo, Yoseoph
dc.date2011-12
dc.date.accessioned2012-11-01T16:50:00Z
dc.date.available2012-11-01T16:50:00Z
dc.description.abstractThe goal of this research was to use Monte Carlo simulations to further develop the model that describes transport imaging by including a more realistic description of the generation region created by the incident electrons. Monte Carlo simulation can be used to determine the energy distribution in bulk materials due to the interaction with incident electrons. In the simulation, the incident electrons undergo both elastic and inelastic scattering events. Through these events, the energy of the electrons is transferred to the target materials. This deposited energy can generate electron-hole pairs and then, via recombination, photons. In the experimental work, these photons are measured by a CCD camera connected to an optical microscope in a scanning electron microscope (SEM). Monte Carlo simulations were performed for a range of target materials and compared to the luminescence distributions measured experimentally. The simulated energy distributions are always spatially narrower than the optical image from the SEM. We propose possible explanations that need to be evaluated: the relationship between deposited energy and final electron distributions in the target material and photon recycling, in which locally generated photons are reabsorbed to produce a wider luminescence distribution. Further experiments are proposed to identify the limiting factors determining the minimum luminescence distribution.en_US
dc.description.urihttp://archive.org/details/theroleofgenerat1094514851
dc.language.isoen_US
dc.publisherMonterey, California. 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.subjectNuclear detection systemen_US
dc.subjectTransport imagingen_US
dc.subjectMonte Carlo simulationen_US
dc.subjectCASINOen_US
dc.subject.lcshNuclear detection systemen_US
dc.subject.lcshTransport imagingen_US
dc.subject.lcshMonte Carlo simulationen_US
dc.subject.lcshCASINOen_US
dc.titleThe Role of Generation Volume and Photon Recycling in "Transport Imaging" of Bulk Materialsen_US
dc.typeThesisen_US
dc.contributor.secondreaderCrooker, Peter P.
dc.contributor.departmentDepartment of Systems Technology
dc.description.serviceRepublic of Korea Army authoren_US
etd.thesisdegree.nameMaster of Science in Combat Systems Technologyen_US
etd.thesisdegree.levelMastersen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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