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.
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Showing 1 to 20 of 27 for “"Nuclear security"”.
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Return on investment in nuclear security: regulations and physical security
Nuclear security is a crucial part of the nuclear industry, and therefore it is important to observe, research and improve its return on investment (ROI). Investments are made not only in the physical security itself, but also in the regulatory framework, and they should be studied holistically …
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From Nonproliferation to Counterterrorism and Beyond: U.S. Foreign Policy, Global Governance and the Evolution of the Nuclear Security Regime
… examines the formation and evolution of the nuclear security regime (NSR) which governs programs, policies and norms associated with the protection of nuclear and radiological materials that sub-state groups might seek to acquire for use in a terrorist attack. The regime is unique in the …
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Analysis of the optical coupling of wavelength-shifting fibers to organic liquid scintillator filled fluoropolymer tubes for industrial and nuclear security applications
Industrial and nuclear security applications continue to push radiation detection development into new and exciting frontiers. In this work, an innovative detection module is developed and tested for use in a cosmic ray imaging (CRI) system designed for oil field characterization and is evaluated …
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Beyond gates, guards and guns : the systems-theoretic framework for security at nuclear facilities
Current approaches to nuclear security can produce elegantly designed physical protection systems (PPS) that may be limited by untenable assumptions or well stated-albeit vague and imprecise-descriptions of how to improve nuclear security culture itself. According to one nuclear security culture …
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Bayesian algorithms for automated isotope identification
… (RIIDs) are widely used in the United States for nuclear security, but these detectors generally have poor performance in isotope identification. While much research is being conducted on alternative detector materials, there is much evidence that the primary problem with these automated …
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Development and Characterization of a Fast Neutron Imaging Telescope (FNIT) for 1--20 MeV Neutrons From the Sun and Nuclear Material
… intended for applications in solar physics and nuclear security. In high-energy solar physics, detecting the presence of low energy accelerated ions in the low corona is recognized as an important goal. The surest indication of the acceleration of these particles is the detection of low energy …
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Pre-ionization studies on the modular theta-pinch experiment for field-reversed configuration applications
… (ICTAS) at Virginia Tech and the National Nuclear Security Administration of the U.S. Department of Energy. LA-UR-24-31269
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Reducing the threat of nuclear terrorism--a report card on the Obama administration's efforts
… if President Barack Obama's efforts to reduce nuclear terrorism have had a meaningful impact. Key areas of observation include how well efforts have been implemented and how effectively the president has fostered domestic and international support. Early in his presidency, President Obama …
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Feasibility study of compact Neutron Resonance Transmission Analysis using a linac, a fusion-based neutron generator, and an isotopic source
Various nuclear security applications such as fuel enrichment analysis and warhead verification seek to identify nuclear materials in a black box target. Neutron Resonance Transmission Analysis (NRTA) is a spectroscopic technique which uses resonant neutron absorption to identify isotopic …
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Characterisation of radiation fields with combined fast-neutron and gamma-ray imaging
… systems. Coordination with universities and nuclear facilities, logistics and experimental planning enabled the successful deployment of imagers at the University of Lancaster, University of Manchester, the National Physical Laboratory and the Atominstitut at Vienna University of Technology. …
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Automated isotope identification algorithms for low-resolution gamma spectrometers
… identifiers (RIIDs) are widely deployed for nuclear security applications, but these detectors generally have poor isotope identification performance. Most of these deployed detectors use low-resolution NaI scintillators due to their low cost and good efficiency. Alternative detection …
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Development and characterization of a high resolution portable gamma spectrometer
… Japan combined with the high demand to enhance nuclear safety and to minimize personal exposure to radioactive materials has a significant impact on research and development of radiation detection instrumentation. Currently, there is ample effort worldwide in the pursuit of radiation detection …
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Voices of the Cold War in Britain, 1945 - 1962
… that were integral to Britain's early nuclear weapons developments: civil defence recruits and anti-nuclear campaigners. It is also the first study of its kind to compare these group experiences with those of a general cohort of civilian interviewees. An emotions history approach is …
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The impact of the 9/11 terrorist attacks on United States' security assistance to Southern Africa : a quantitative analysis
… United States government who approached regional security cooperation with a primarily minimalist approach. During the pre-9/11 years the United States did provide Southern African governments with some security sector assistance, primarily in direct military training and law enforcement …
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Monte Carlo Method for Calorimetric NRF Cargo Screening
A number of fields in nuclear security require isotopic analysis and identification. Nuclear resonance fluorescence(NRF) has provided a non-intrusive isotope-sensitive measurement technique to detect special nuclear material in cargo [8], and has been proposed to be used as a verification technique …
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Technical basis for use of a correlated neutron source in the uranium neutron coincidence collar
Nuclear nonproliferation efforts rely on a variety of safeguards to protect sensitive materials in nuclear facilities. The enrichment of fresh light-water-reactor fuel assemblies is verified by several inspectorates using the uranium neutron coincidence collar (UNCL), which uses neutrons from an …
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CFD Simulations of an Air-Conditioned Radiological Materials Staging Room: Comparison Between COMSOL and ANSYS Codes
… are stored in facilities managed by the National Nuclear Security Administration (NNSA). These packages must be stored in a ventilated facility to prevent the packages, internal components, and outer surfaces from reaching prescribed limits. The objective of this work is to conduct steady-state …
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Contemporary China-North Korea Bilateral Security Relations: Establishing the Role of Power and Ideas in Foreign Policy Decision-making
… to existing studies that isolate state identity, security, or economic considerations in China’s decision-making, this thesis asserts Beijing’s North Korea policy is best understood by synthesizing realist and constructivist theories. Building on this model, the first aim of the thesis is to …
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Cosmic ray muons for spent nuclear fuel monitoring
… is a steady increase in the volume of spent nuclear fuel stored on-site (at reactor) as currently there is no permanent disposal option. No alternative disposal path is available and storage of spent nuclear fuel in dry storage containers is anticipated for the near future. In this …
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Neutron Resonance Transmission Analysis of Nuclear Material Using a Portable D-T Neutron Generator
The accurate identification and quantification of nuclear material is important for nuclear security, nonproliferation, and safeguards missions. Existing techniques have limitations in terms of their isotopic specificity, isotopic range, and their capacity to analyze thick or shielded targets. …
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