Theoretical and experimental investigations in characterizing and developing multiplexed diamond-based neutron spectrometers

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Theoretical and experimental investigations in characterizing and developing multiplexed diamond-based neutron spectrometers

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/15084

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dc.contributor.advisor Prelas, Mark Antonio, 1953- en_US
dc.contributor.author Lukosi, Eric
dc.date.accessioned 2012-08-29T18:58:04Z
dc.date.available 2012-08-29T18:58:04Z
dc.date.issued 2012
dc.date.submitted 2012 Spring en_US
dc.identifier.other LukosiE-040412-D611
dc.identifier.uri http://hdl.handle.net/10355/15084
dc.description Title from PDF of title page (University of Missouri--Columbia, viewed on August 29, 2012). en_US
dc.description The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. en_US
dc.description Dissertation advisor: Dr. Mark Prelas en_US
dc.description Includes bibliographical references. en_US
dc.description Vita. en_US
dc.description Ph.D. University of Missouri--Columbia 2012 en_US
dc.description Dissertations, Academic -- University of Missouri--Columbia -- Nuclear engineering en_US
dc.description "May 2012" en_US
dc.description.abstract In this work a novel technique of multiplexing diamond is presented where electronic grade diamond plates are connected electrically in series and in parallel to increase the overall detection efficiency of diamond-based neutron detection systems. Theoretical results in MCNPX indicate that further development in this software is required to accurately predict the response of diamond-based neutron spectrometers. However, the results accurately indicate that an equivalent diamond plate 1cm thick only lowers the energy resolution of the 12C(n,αo)9Be peak from a 14.1 MeV interrogating neutron by a factor of two compared to a single diamond plate 0.5mm thick while increasing the detection efficiency from 1.34 percent for a single diamond plate to 25.4 percent. Further, the number of secondary neutron interactions is approximately 5.3 percent for a 1cm thick diamond plate. In addition, photons can interfere with lower energy neutron signals when multiplexing is used, especially at low photon energies, although the full energy peak still does not dominantly present itself in the pulse height spectrum for multiplexed arrays approaching 1cm with respect to the incident neutron vector. Experimental results indicate that series multiplexing is not capable for use as a means of increasing the active detection volume because of the interaction of the diamond plates in series with each other, where severe signal degradation is seen due to the equal impedances of the single crystal diamond plates. However, parallel multiplexing is shown to have great promise, although there are limitations to this technique due to the large capacitance at the preamplifier input for a large parallel multiplexed array. Still, the latter multiplexing technique is shown here to be capable of producing the largest diamond detection medium in a single detector with spectroscopic capabilities reported to date. en_US
dc.format.extent xii, 141 pages en_US
dc.language.iso en_US en_US
dc.publisher University of Missouri--Columbia en_US
dc.relation.ispartof 2012 Freely available dissertations (MU) en_US
dc.subject neutron detection en_US
dc.subject detection efficiency en_US
dc.subject multiplexing en_US
dc.subject spectroscopic capabilities en_US
dc.title Theoretical and experimental investigations in characterizing and developing multiplexed diamond-based neutron spectrometers en_US
dc.type Thesis en_US
thesis.degree.discipline Nuclear engineering en_US
thesis.degree.grantor University of Missouri--Columbia en_US
thesis.degree.name Ph. D. en_US
thesis.degree.level Doctoral en_US
dc.relation.ispartofcommunity University of Missouri-Columbia. Graduate School. Theses and Dissertations. Dissertations. 2012 Dissertations


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