Graduate Thesis Or Dissertation
 

Neutron radiography and tomography : determining and optimizing resolution of neutron sensitive multi channel plate detectors

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/th83m195z

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  • The objective of this work was to determine and optimize the resolution of a neutron sensitive Multi-Channel Plate (MCP) detector in order to determine its capabilities in radiography and tomography. The Oregon State University, Neutron Radiography Facility added an MCP Detector in 2012 in order to analyze these capabilities. The leading factor in the generation of both two-dimensional and three-dimensional imaging was the spatial resolution of the detector. The MCP detector developed by Nova Scientific Inc. uses the ¹⁰B(n,α)Li⁷ reaction within the MCP's bulk walls in order to convert the neutron into an α and lithium particle which have a high probability of initiating an electron avalanche that generates an output pulse. This reaction governs the spatial resolution. The detector's mechanics allow for a theoretical maximum spatial resolution of 17 μm. By fine tuning the electronics and using a thermal neutron beam, count rates can be recorded throughout the active detector area, where lower count rates can be used to identify areas of neutron absorption or attenuation within the object. These differences are used to create a radiograph which gives information on the material's attenuation coefficient and geometry of the object being imaged. For this study, the objects include resolution masks, American Society for Testing and Materials (ASTM) Standards, along with a variety of other materials. Since the radiograph is digitally created in near real-time, the detector has the capability of neutron tomography with the radiograph's resolution being on the order of the theoretical limit.
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