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 17 of 17 for “"Depleted Uranium"”.
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The Chemical-Induced Genotoxicity of Depleted Uranium
Uranium has been mined for many years and used for fuel for nuclear reactors and materials for atomic weapons, ammunition, and armor. While the radioactivity associated with uranium mining has been linked to the development of lung and kidney cancers, and leukemia, little is known about the direct …
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Cytogenetic Analysis Of Depleted Uranium Exposure And Age-Dependent Susceptibility To Ionizing Radiation
<p>Chapters 2 and 3:</p> <p>Depleted Uranium (DU) is a high-density heavy metal that has been used in munitions since the 1991 Gulf War. DU is weakly radioactive and chemically toxic and long term exposure may cause adverse health effects. This study evaluates genotoxic effects of DU exposure in …
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Contamination of surface water by depleted uranium from Nuclear Metals, Incorporated, in Concord, MA
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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Nuclear Fuel Requirements For the American Economy - A Model
… the number of reactors, and masses of natural Uranium and other fuels used.</p> <p>Energy demand, including electricity and hydrogen, is obtained from US DOE historical data and projections, along with other studies of potential hydrogen demand. An option to include other energy demand to …
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Monte Carlo model of a low-energy neutron interrogation system for detecting fissile material
… isotopes as in the case of a few grams of uranium-235 in a kilogram of depleted uranium will also respond to this method but much more weakly. The system as proposed is viable and further simulation and experimental work will elucidate the behavior of this system under a wide range of cargo …
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Sensitivity analysis of nuclear fuel cycle transitions
… parameter was the most influential to the final depleted uranium and total idle reactor capacity performance metrics, and the fleet share ratio and cooling time input parameters were the most influential to the final high level waste amount in the simulation. The one-at-a-time sensitivity …
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Finite Element Analysis of Adiabatic Shear Bands in Impact and Penetration Problems
We study axisymmetric deformations of depleted uranium (DU) and tungsten heavy alloy (WHA) rods impacting at normal incidence both a rigid, planar target and a thick, deformable steel target. Each deformable material is modeled as elastic thermoviscoplastic; the flow stress increases with an …
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Self-protection analysis of denatured thorium-plutonium fuel
… spent fuel caused by the decay of the isotope uranium-232, which releases a high-energy gamma of 2.6 MeV. Next, this study examined the possibility of denaturing the fuel with depleted uranium in order to dilute the weapons-usable isotope uranium-233 in the spent fuel. The U-232 dose rate was …
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A fission-fusion hybrid reactor in steady-state L-mode tokamak configuration with natural uranium
… configuration with a subcritical natural or depleted uranium pebble bed blanket. A liquid lithiumlead alloy breeds enough tritium to replenish that consumed by the D-T fusion reaction. Subcritical operation could obviate the most challenging fuel cycle aspects of fission. The fission blanket …
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Establishing uranium migration parameters for the Indian Springs Range
For the past 24 years, depleted uranium (DU) kinetic energy penetrators used by the US Air Force have been tested and evaluated to develop targeting system algorithms at a site in the Mojave Desert. This two-fold study focused on reducing uncertainties in the environmental parameters used to model …
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Powder Processing and Characterization of W-3Ni-1Fe Tungsten Heavy Alloy
… form as a replacement material for depleted uranium in kinetic energy penetrators. Milling time and sintering temperature were varied from 15 to 100 hours and 1000 to 1300°C respectively. Particle size analysis and SEM showed a bimodal particle size distribution with most of the …
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Monte Carlo simulations of a physical cryptographic warhead verification protocol using nuclear resonance fluorescence
… is replaced with reactor-grade plutonium or depleted uranium are shown to be detectable in realistic measurement times. An optimized geometric hoax that mimics the areal densities and attenuations of the authentic template warhead along one axis can also be detected with a second measurement …
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Conceptual Design of a Nuclear Microreactor Transportation Cask
… protected from puncture or, better, replaced by depleted uranium (which has higher density and melting point) in further work. Redwood impact limiters and stainless steel 316 shims are sufficient to keep the vessel and heat pipes intact under the condition that the clearance holes through which …
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MCNP4B modeling of pebble-bed reactors
… -20,000 pebbles would be needed if loaded with depleted uranium. But the associated reactivity loss would necessitate a compensatory increase in core height of approximately 50 cm. Such a change in core loading, as well as the properties of the special pebbles, would be noticed in a safeguarded …
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Compact Capabilities: Developing and Evaluating a Field-Portable Neutron Resonance Capture Analysis System
… the thorium cycle shares many aspects with the uranium and plutonium fuel cycles, it introduces the requirement for the nondestructive assay of multiple isotopes (²³8U, ²³²Th, ²³³U, ²³⁵U, or ²³⁹Pu) in varied concentrations and chemical or physical forms. Current methodologies used for …
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Modeling contaminant transport and fate and subsequent impacts on ecosystems
… ecological risk assessment for exposure to depleted uranium (DU) at Aberdeen and Yuma Proving Grounds (APG and YPG) revealed that a reduction in plant root weight is considered likely to occur. For most terrestrial animals at YPG, the predicted DU dose is less than that which would result in …
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Ssessment methodology for proliferation resistant fast breeder reactor
… US fast reactor designs have avoided the use of uranium blankets. While reducing the amount of plutonium produced, this omission also restrains the reactor design space and has several disadvantages over blanketed cores. This study investigated many blanket options that would satisfy the …