Graduate Thesis Or Dissertation

 

An Active Interrogation Technique Based on Photofission for Non-destructive Assay of Used Nuclear Fuel Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1r66j469h

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  • High-energy delayed γ-rays from photofission were demonstrated to be signatures for detection and identification of special nuclear materials. Such γ-rays were measured in between linac pulses using independent data acquisition systems. A list-mode system was developed to measure low-energy delayed γ-rays after irradiation. Photofission product yields of ²³⁸U and ²³⁹Pu were determined based on the measured delayed γ-ray spectra. The differential yields of delayed γ-rays were also proven to be able to discriminate nuclear and non-nuclear materials. The measurement outcomes were compared with Monte Carlo simulation results. It was demonstrated that the current available code has capabilities and limitations in the simulation of photofission process. A two-fold approach was used to address the high-rate challenge in used nuclear fuel assay based on photofission technique. First, a standard HPGe preamplifier was modified to improve its capabilities in high-rate pulsed photofission environment. Second, advanced pulse processing algorithms including template-matching and de-randomization methods were shown to greatly improve throughput rate without large sacrifice in energy resolution at ultra-high input count rate.
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