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 43 for “"Nuclear Material"”.
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Modeling special nuclear material diversion from a pyroprocessing facility
… fuel cycle implemented in the US, used nuclear fuel (UNF) steadily increases. One proposed solution is the transition to a closed nuclear fuel cycle, in which reprocessing reduces build up of UNF. Pyroprocessing is an attractive method for this transition for its capabilities separating …
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Optimization of routes and modes of nuclear material transportation constrained by safety considerations
Digitized by Kansas Correctional Industries
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Optimization of routes and modes of nuclear material transportation constrained by safety considerations
Digitized by Kansas Correctional Industries
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Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material
… an avenue to smuggle unsecured or stolen special nuclear material (SNM). The only direct method fielded to indicate the presence of SNM is by passive photon/neutron radiation detection. Active interrogation using neutral particle beams to induce fission in SNM is a method under consideration. One …
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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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Development of Monte Carlo models of a gamma-ray nondestructive assay system for nuclear material control and accountability
Nuclear material control and accountability (NMCA) is vital to safeguarding special nuclear materials (SNM) against theft and diversion. Nondestructive assay (NDA) via gamma-ray spectrometry is one of the most common methods employed by NMCA programs to determine the amount or composition of SNM. …
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Using a superconducting cyclotron to detect special nuclear material through multiple monoenergetic gamma radiography and o-axis photon scattering/
… measure o-axis photon scattering to nd special nuclear material (SNM). The cyclotron is a small enough accelerator to be a viable option for scanning commercial cargo containers at maritime ports, airports, rail crossings, and other places of interest. This research presents a technique for …
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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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Imaging the ionization track of alpha recoils for the directional detection of weapons grade plutonium
Since the dawn of the nuclear weapons era, political, military, and scientific leaders around the world have been working to contain the proliferation of Special Nuclear Material and explosively fissile material. This paper describes the construction of a prototype, directional, fast neutron …
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Industrial automation and control in hazardous nuclear environments
… of radiation workers by handling radioactive nuclear material. This decreases glovebox worker dose and exposure to tools, sharps, and fines. This effort examines the hardware and software framework developed to support the use of a Port Deployed Manipulator (PDM) for a contact task. This …
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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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The regional susceptibility of the intervertebral disc to mechanically induced disruption and herniation
… discography, provides a preferred passage for nuclear material through the annulus, independent of any longer-term degenerative changes. Herniations were mechanically induced in discs that had been punctured with either a 25-gauge or a larger 18-gauge needle. Transverse sectioning of the whole …
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Compact neutron sources for zero knowledge warhead verification via epithermal neutron transmission analysis
… the security risk of transporting special nuclear material to dedicated verification facilities. Experimental results demonstrate the feasibility of a tomographic approach to zero-knowledge physical cryptography, and MC simulations offer promising results for compact epithermal neutron …
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Epistemic Communities and Proliferation: The Implications of Nuclear Knowledge
<p>How do epistemic communities facilitate nuclear proliferation? The nuclear nonproliferation regime contains numerous actors exerting varying levels of influence on policy outcomes and state behavior. Neoliberal institutional theory emphasizes the role of sub-national groups play in forming …
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The deterrence of nuclear terrorism through an attribution capability
The state of the world is such that the pace of nuclear weapons proliferation appears to be increasing. The growing number of nuclear states and amount of nuclear material available poses a great challenge to those that would attempt to keep nuclear weapons out of the hands of terrorists and other …
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Spectral characterization of actinide signatures for nuclear remote sensing applications
… community to develop new ways to assess a nuclear event at a distance. Distinguishing between a nuclear and non-nuclear fireball and determining the nuclear material and amount present in the fireball are necessary to inform response accordingly. Spectroscopy provides potential avenues for …
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The isolation of syaptic myonuclei and Schwann cell nuclei for DNA analysis from human skeletal muscle
… and magnetic-activated sorting technologies. Nuclear material separated from muscles of patients with different clinical diagnoses using this technique may provide a critical approach to studying the epigenetic regulation of neuromuscular junction development and maintenance in both health and …
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Investigative study of long-term packaging effects and donor characteristics on acellular dermis scaffolds
… grafts, engineered scaffolds, and hernia repair materials. Before tissue sources can be utilized commercially for these practices they usually are decellularized, i.e., have all cellular and nuclear material removed from the extracellular matrix (ECM), and then they are packaged in a convenient, …
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Fuel cycle transition simulation capabilities in CYCLUS
… the demand for tools necessary to model complex nuclear fuel cycles (NFCs) and advanced reactor technologies. This thesis demonstrates the capability of CYCLUS , the agent-based fuel cycle simulator, to model, simulate, and analyze real-life fuel cycle transition scenarios. I introduce new …
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A novel detection system using neutron/gamma pulse shape discrimination, for use in active interrogation environments
… are being sought to identify 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 …
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