Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Active interrogation"”.
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Neutron Response Vectorization and Optimization of Moderating Neutron Spectrometers for Active Interrogation
… impossible in the maritime environment. Active interrogation, while increasing the radiative signature, also increases the radiative background such that measuring SNM signatures becomes difficult, if not impossible, especially given an unknown and complex environment. Over the last two …
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Modeling and characterization of a monoenergetic gamma-ray imaging system for active interrogation applications
The goal of this thesis is to develop an understanding of the benefits of using a monoenergetic photon source for imaging of cargo containers, as opposed to polyenergetic bremsstrahlung beams which are currently used. Monoenergetic beams can reduce dose to both the cargo and any potential stowaways …
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A novel detection system using neutron/gamma pulse shape discrimination, for use in active interrogation environments
… special nuclear material more accurately. Active interrogation is a current field of research for this application, capable of penetrating shielding materials but which can feature a complex and challenging radiation field for detectors to operate in. This research was aimed at improving …
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Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material
… by passive photon/neutron radiation detection. Active interrogation using neutral particle beams to induce fission in SNM is a method under consideration. One by-product of fission is the creation of fragments that undergo radioactive decay over a time period on the order of tens of seconds …
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Dual neutral particle induced transmutation
… sought to use neutrons as well as photons for active interrogation of cargo to detect the smuggling of highly enriched uranium -- a concept that would require modeling of the transmutation caused by both neutrons and photons. As photonuclear transmutation has yet to be modeled, new methods need …
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New considerations for compact cyclotrons
… generation of ¹³ for medical imaging, active interrogation for counter-proliferation, and fast neutron imaging for Enhanced Stockpile Surveillance (ESS). The first two applications are broadly reviewed. The ESS imaging application extends from preliminary work performed by Lawrence …
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Shifting Trust: How Generation Z Canadians Determine Trust and Credibility in Online News and Information
… highlights a shift from passive consumption to active interrogation of news, and paints a clearer picture of Canada’s declining trust dilemma. This research suggests strategies for mainstream, independent, and citizen journalism to foster trust, ensure credibility, and engage effectively with …
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Remote detection of fissile material : Cherenkov counters for gamma detection
The need for large-size detectors for long-range active interrogation (Al) detection has generated interest in water-based detector technologies. AI is done using external radiation sources to induce fission and to detect, identify, and characterize special nuclear material (SNM) through the gamma …
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Development of a switchable radioisotope generator
<p>The Switchable Radioisotope Generator utilizes alpha-induced reactions to produce a combination of photons, neutrons, and protons with varying fluxes dependent on target materials and source geometry. The activity/strength of the secondary radiation is further controlled by manipulating the …
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Algorithms for nuclear data analysis applied to safety and materials
… Lifetime Spectroscopy (PALS) experiment and an active interrogation experiment for the non-destructive assay (NDA) of uranium samples. PALS is a widely-used non-destructive technique used to study defects and vacancies in a variety of different materials. The positron trapping at vacancies in …