Master Theses & ProjectsMaster Theses & Projects (FESNS)https://hdl.handle.net/10155/3812024-03-29T13:55:34Z2024-03-29T13:55:34ZThe conceptualization and parameterization of a gaseous detector rasterizing pinhole gamma cameraPrice, Terry J.https://hdl.handle.net/10155/16292023-06-13T14:16:12Z2016-08-01T00:00:00ZThe conceptualization and parameterization of a gaseous detector rasterizing pinhole gamma camera
Price, Terry J.
This thesis details the conceptualization and parameterization of a gaseous detector rasterizing pinhole gamma camera. In this thesis, there is a literature review that describes the historical development of gamma imaging, a technical background that aims to give the reader the prerequisite background knowledge, a methodology, and, a result and discussion chapter. The thesis includes studies that determine if the concept of a gaseous detector rasterizing pinhole gamma camera is feasible, mathematical modeling that allowed for the exploration of the idea, software development that automated the mathematical modeling, parametric studies that explored the performance of various sets of design parameters, and, finally an iterative engineering design process that converged at a final set of design parameters. Ultimately, a set of design parameters, from which a prototype may be constructed, were developed.
2016-08-01T00:00:00ZUsing MELCOR with enhanced predictive capabilities via Thermochimica to model two severe accident cases of a generic BWR with Zry-2 and FeCrAlBreeden, Benjamin A. T.https://hdl.handle.net/10155/14852022-08-09T16:27:00Z2022-07-01T00:00:00ZUsing MELCOR with enhanced predictive capabilities via Thermochimica to model two severe accident cases of a generic BWR with Zry-2 and FeCrAl
Breeden, Benjamin A. T.
The primary goal of this work was to enhance MELCOR’s material modelling capabilities via one-way coupling of Thermochimica. MELCOR is a state-of-the-art code used to simulate the severe accident progression of a nuclear power plant. The first objective was developing the capabilities in Thermochimica to handle the Ionic Two-sublattice Liquid Model in order to leverage the Thermodynamics of Advanced Fuels – International Database (TAF-ID). Using empirically derived data from the TAF-ID allowed Thermochimica to reliably predict the stable phases of nuclear materials and their composition. Secondly, two test case scenarios were simulated in MELCOR using a generic boiling water reactor design that included Case I: Zircaloy-2 cladding, and Case II: FeCrAl cladding. The results from these two cases were analyzed using a one-way coupling approach with Thermochimica to demonstrate potential areas for the improvement o fMELCOR’s current material modelling capabilities.
2022-07-01T00:00:00ZStudy of LaBr3 (Ce) detector response to high energy helium ionsNayve, Christianhttps://hdl.handle.net/10155/14822022-07-05T20:07:06Z2022-04-01T00:00:00ZStudy of LaBr3 (Ce) detector response to high energy helium ions
Nayve, Christian
The space radiation environment is a complex mixed field composed of neutral and charged particles such as photons, protons, alpha, and other particles. The mixture of these different particles creates a challenge in any accurate measurement with radiation detection devices. Lanthanum Bromide scintillator detector (LaBe3: Ce) has been successfully used as a gamma spectrometer inside space crafts. However, data on its response to other particles such as charged particles remains limited. From a radiation protection perspective, it is important to understand the response of the LaBr3 scintillator in the presence of heavy ions to provide more accurate measurements of the gamma fields within such a complex radiation environment. A series of Monte-Carlo simulations using MCNP/X version 2.6 have been performed along with a series of experiments using the Heavy Ion Medical Accelerator in Chiba, Japan. Measurements of the detector response function were conducted using He ion beams at various energies.
2022-04-01T00:00:00ZDevelopment of neutron monitor for fusion systemsLi, Zhehttps://hdl.handle.net/10155/14442022-06-14T18:22:47Z2022-04-01T00:00:00ZDevelopment of neutron monitor for fusion systems
Li, Zhe
Currently, the detection of neutrons employs sensors with a high thermal neutron response embedded in a thermalizing medium. However, this approach does not provide much information on neutron energy and, therefore, is inherently unable to identify sources commonly used in the industry. The current study proposes the use of a bi-atomic scintillator crystal, LaCl3, to detect fast neutrons above 1 MeV in general and develop a neutron monitor for (D, D) fusion reaction in particular. The approach uses the (n, p) reaction on a bi-atomic scintillator in the neutron energy range above 1 MeV. Thus, a series of Monte Carlo simulations have been performed using MCNP/X along with a series of experiments carried out using a neutron generator based on the (D, D) reaction at 106 n/s. Both sets of data were compared in term of the pulse height spectra. The analysis of the data suggests that a prominent peak from the emitted protons can serve to monitor the neutron emission from the generator.
2022-04-01T00:00:00Z