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 19 of 19 for “"Thermal Neutrons"”.
-
Photographic detector for thermal neutrons
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1961.
-
Analytical Separation of Zirconium-95 and Niobium-95 from Uranium Irradiated by Thermal Neutrons
The presence of zirconium and niobium in nuclear spent fuel is undesirable, both because these metals interfere seriously with later Fuel reprocessing steps, and because of the high level of penetrating gamma radiation emitted by radioactive zirconium and its daughter niobium. In this thesis, after …
-
Spectroscopic and Electrical Characterization of SiO<sub>x</sub> and GaN Device Structures as a Function of Irradiation
… Hence, GaN Schottky diodes were irradiated with thermal neutrons (25 meV) and fast neutrons (1 MeV) at three different fluences (10<sup>14</sup>, 10<sup>15</sup> and 10<sup>16</sup> n/cm<sup>2</sup>) and we measured resulting defects optically and electrically. Below 1015 n/cm2, neutron …
-
Hydrogen Distribution in Metal Hydrides and its Effect on Reactor Physics Calculations
… This work focuses on the scattering behavior of thermal neutrons, which are defined to have relatively low energy (typically less than 1-10 eV). Thermal neutrons are particularly interesting since, unlike their higher-energy counterparts, they are unable to ignore the molecular bonds that hold a …
-
Tetracycline-7-boronic acid
… a concentration of material capable of accepting thermal neutrons, thus producing localized high-energy alpha radiation. The fact that the tetracyclines are not retained by normal tissue should remove the danger of destruction of this tissue.
-
Development and characterization of a dual neutron and gamma detector
… detect simultaneously gamma radiation as well as thermal neutrons. A compact data acquisition system has been used for neutron and gamma discrimination. The system has been tested with different gamma energies and with an Am-Be neutron source at the University of Ontario Institute of Technology …
-
The design, construction, and study of the effect of a cadmium-aluminum shield for the V. P. I. subcritical reactor
… that the shield is opaque to an influx of thermal neutrons. This is manifested by a depression in neutron density near the boundaries of the pile when the shielded and unshielded region counting rates are compared. The natural-uranium slugs and the highly radioactive source are padlocked …
-
Thermal neutron analysis for improvised explosive device detection
… devices is considered. The technique utilized is thermal neutron analysis. In this method, thermal neutrons are used to interrogate a volume for the presence of nitrogen, which is used as an indicator of explosive, given its unusual high energy line in the gamma ray spectrum generated by thermal …
-
Construction and characterization of a fission converter based epithermal neutron beam for BNCT
… of a fission converter to produce a source of epithermal neutrons suitable for BNCT. The final design, construction and characterization of a new epithermal neutron beam is presented. A high intensity source with low contamination is obtained using a fission converter driven by thermal neutrons …
-
A comparison of three gadolinium based approaches to cancer therapy
… and Auger cascade electrons upon absorbing thermal neutrons. The low energy, nanometer-range, Auger electrons are absorbed locally and significantly increase cell killing when Gd binds to DNA. Two other methods induce Auger electrons in gadolinium isotopes: the beta decay of 159Gd, and K …
-
Radiobiological evaluation of new boron delivery agents for boron neutron capture therapy
… comparisons between the different compounds for thermal neutron irradiations were performed with approximately 5 [mu]g 10B/ml in the culture medium to allow radiation induced effects to govern the observed response. Using less than 300 [mu]g of compound and 250 kVp X-rays as control irradiations, …
-
Radiation effects on the blood-brain barrier
… the vasculature after the target is exposed to thermal neutrons. This allows for a 2- to 3-fold increase in the calculated dose to the endothelial cells. However, this technique has been criticized because there is no direct evidence that the endothelial cells receive an absorbed dose from the …
-
Optimization of detector response simulations for multiple particles created by neutron-induced reactions
… research focused on optimizing the yield of thermal neutrons in the PNF system, which can then be used as a source for the interactions with the biological sample while minimizing the background radiations. Moderating layer materials and fuel configurations of the graphite monolith, and the …
-
Phonon Dispersion Relations in Chrystals
… can provide much information about the thermal motions in solids and liquids. Neutrons which have been thermalised by the moderator of a nuclear reactor have energies similar to those associated with these thermal motions. It so happens that they also have wavelengths similar to the …
-
Fast neutron leakage spectra for assemblies containing thorium, D{u2082}O and natural uranium
… A ²³⁵U fission disc, irradiated by a beam of thermal neutrons from the V.P.I. & S.U. reactor. provided a fast neutron source. Neutron leakage spectra were taken over the energy range between 100 keV and l.65 MeV. The spectrometer was calibrated using neutrons from the ³H(p,n)³He reaction in a …
-
Part I. Cytochrome c oxidase active-site modeling: Synthesis and characterization of new unsymmetrical tris(imidazole- and pyridine-appended) picket-fence porphyrins and their metal complexes. Part II. Toward fullerene-based radiopharmaceuticals: High-yield neutron activation of endohedral holmium-165 metallofullerenes
… and empty C 60 were then bombarded with neutrons under differing flux conditions to understand the various modes of compound degradation and to maximize yields of activated 166 Ho x @C 82/84 [ 165 Ho(n,γ) 166 No]. C 60 survived irradiation to a fairly high extent (>80%) at total neutron …
-
Polyethylene-Based Multifunctional Composite Material for Radiation Shielding, Passive Thermoregulation, and In-Situ Fabrication for Space Exploration
… gamma rays, and secondary particles, such as thermal neutrons, are abundant in low Earth orbit (LEO) and deep space environments like lunar and Martian surfaces, where space missions are often conducted. Such sources of space radiation can induce severe damage to human tissue and critical …
-
NUCLEAR DEFORMATION IN FISSION FRAGMENTS STUDIED WITH NOVEL IMPLEMENTATIONS OF DOPPLER SHIFT LIFETIME MEASUREMENT TECHNIQUES
… for example, at radioactive ion beam facilities. Thermal neutrons have been delivered by the ILL (Insti- tut Laue-Langevin) nuclear reactor and the FIPPS (FIssion Product Prompt gamma-ray Spectrometer ) instrument has been used for gamma-ray spectroscopy. The active target has allowed to “tag” the …