Graduate Thesis Or Dissertation
 

Optical Spectroscopy of Laser-Produced Plasmas via Fiber Optics for Material Characterization

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  • Characterization of uranium isotope compositions is of great interest in many nuclear sub-areas for safeguards purposes. Reprocessing facilities utilizing pyroprocessing raised an issue of uranium isotope monitoring due to the difficulty to apply traditional approaches under extreme environments. An rapid and remote method to characterize uranium isotope compositions for such facilities is needed. Fiber-optic laser-induced breakdown spectroscopy (FOLIBS) has proved its potential for remote material detection, with the high power laser pulses being delivered and plasma emission collected through optical fibers. However, measurement of uranium isotopes by FOLIBS remains challenging due to the ultra-high resolution needed to resolve isotope shifts of uranium. Atomic absorption techniques, such as LAS and LIF, utilized the plasma generated by FOLIBS and could provide enough resolving power to measure adjacent peaks from different isotopes. The object of this research is to develop a detection system based on FOLIBS, LAS and LIF to achieve characterization of uranium isotope compositions remotely with real time or near real time analysis. An FOLIBS system was developed to address material detection remotely and comparison experiments were conducted between FOLIBS and conventional LIBS. Remote material detection was successfully approached with the built FOLIBS system. A upgraded detection system based on FOLIBS system was developed by incorporating LAS and LIF to achieve uranium isotope characterization remotely, with peaks from different isotopes clearly distinguished from each other and enrichment level being reasonably estimated. Further research on the ability of the detection system to be applied to extreme environment will be conducted in the future.
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  • This research is being performed using funding received from the DOE Office of Nuclear Energy’s Nuclear Energy University Program.
  • This research is partially supported by U.S. Nuclear Regulatory Commission Grant No. NRC-HQ-84-15-G-0014.
  • Pacific Northwest National Laboratory is a multi-program national laboratory operated by Battelle for the U.S. Department of Energy under Contract No. DE-AC05-76RL01830.
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  • Pending Publication
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  • 2022-09-20 to 2024-01-11

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