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 20 of 27 for “"neutron radiation"”.
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Investigation by neutron diffraction utilizing white neutron radiation
"The most probable reactor core neutron velocity was determined by analysis of data obtained from single crystals of copper and lithium fluoride. Derivation of the relationship between the maximum in experimental count rate and the most probable velocity, an error analysis of the method, and the …
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Thermoluminescent response of LiF:Mg to gamma and neutron radiation
Digitized by Kansas Correctional Industries
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Thermoluminescent response of LiF:Mg to gamma and neutron radiation
Digitized by Kansas Correctional Industries
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Modelling the neutron radiation environment of HTS magnets in thermonuclear fusion reactors
L'abstract è presente nell'allegato / the abstract is in the attachment
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Compact modeling of neutron damage effects in a bipolar junction transistor
The performance of microelectronics in a radiation environment is an important concern for defense and space applications. Bipolar junction transistors (BJTs), in particular, are susceptible to neutron radiation. Neutron radiation affects BJT performance primarily by creating lattice defects, which …
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Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material
… 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 by-product of fission is the creation of fragments that undergo radioactive decay over a time period on the …
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Carbon Nanotube Based Dosimetry of Neutron and Gamma Radiation
… another 20 years, accurate information regarding neutron radiation exposure is more important than ever. Structural components such as the reactor pressure vessel (RPV) become embrittled by neutron irradiation, reducing their capability to resist crack growth and increasing the risk of …
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NUCLEATION AND DETECTION IN TENSION METASTABLE FLUIDS
Neutron detection and spectroscopic techniques using state-of-the-art systems is covered. A novel approach using conventional (e.g., LiI, He-3, BF3) detectors coupled with Monte-Carlo code simulations to develop spectroscopy information was developed (in lieu of present-day tedious methods …
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Developments and benchmarking applications for Grasshopper : a Geant4 based physics simulation tool
… outside of the realm of experimentation in the radiation sciences. While multi-use toolkits exist for particles simulation (such as the popular MCNP or SRIM programs), these computational tools are often difficult for untrained users to adapt into their projects. Geant4 is one such toolkit that …
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Effect of breathing hypoxic gas mixtures followed by irradiation on tumour cell survival in experimental mouse tumors
… cells, which limit the effectiveness of photon radiation. This dissertation outlines an attempt to i increase the sensitivity of mouse tumours to X- and gamma radiation by reducing the fraction of hypoxic cells in tumours. It is proposed that this can be achieved by making the tumour bearing …
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Little Big Bangs in Helium-Three
… superfluid are destroyed by local heating with neutron radiation, we have studied the properties of degenerate Fermi systems under certain extreme non-equilibrium conditions. First, we consider the dynamical evolution of localized hot spots in ultralow temperature Fermi liquids. Within a model …
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Simulating Properties of Scintillating Integrated Fibers as Conformal Radiation Detectors
… create fibers with novel capabilities, including radiation detection when combined with elements of scintillating fiber detectors. By sensing and processing scintillation light within the fiber itself, integrated fibers could be woven into a fabric to make a rugged, conformal radiation detector. …
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Real-time RBS analysis of plasma erosion in DIONISOS
… to 5 eV, and must be able to withstand intense neutron radiation as well as high heat fluxes. It is still unclear how some proposed first wall materials such as tungsten and molybdenum will behave in environments with these plasmas. Scientists must provide evidence supporting the lifetime, fuel …
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Materials Design for Advanced Nuclear Energy Systems: Refractory High Entropy Alloys and Metallic Multilayer Composites
… temperatures, corrosive environments, and neutron radiation damage. In this thesis, I focus on two approaches to designing better materials for advanced reactors, high entropy alloys (HEAs) and metallic multilayer composites (MMLCs). HEAs are chemically disordered solid solutions combining …
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Development of image processing systems for cosmic ray effect analysis
Cosmic neutron radiation in the atmosphere is a harsh environment for modern aircraft electronics. High-energy neutron interactions with silicon produce spurious charge which can cause malfunctioning or even failure to advanced microelectronic devices. To study neutron interactions, a CCD based …
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Boolean Weightless Neural Network Architectures
… subjected to accelerated ground based generated neutron radiation simulating the atmospheric radiation spectrum experienced at commercial avionic altitudes. A trial investigating the resilience of weightless hardware Boolean elements in comparison to standard weighted arithmetic logic is …
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Towards measuring the relative biological effectiveness of high-energy neutrons at iThemba LABS
In space, neutrons with energies of up to several TeV are produced through the interac-tions of primary cosmic radiation with matter such as in spacecraft shielding, and in the atmospheres and regoliths of moons and planets. The development of radiation health-risk models for space exploration …
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Design and Development of Damage-Tolerant Active Materials
… structural metals subject to 14.1 MeV fast neutron radiation, which produces transmutation helium (He) that embrittles grain boundaries. The strategy pro-posed is to incorporate nano-phases that can absorb and store helium in their bulk lattice, forming a “helide” compound. To identify …
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Modeling radiation-induced mixing at interfaces between low solubility metals
This thesis studies radiation-induced mixing at interfaces between low solubility metals using molecular dynamics (MD) computer simulations. It provides original contributions on the fundamental mechanisms of radiation-induced mixing and morphological stability of multilayer nanocomposites under …
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