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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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  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2016-03-11T22:10:15Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) WenXianfei2016.pdf: 2049359 bytes, checksum: 363c5cb1144feae782940330c263c8b4 (MD5)
  • description.provenance : Submitted by Xianfei Wen (wenxi@oregonstate.edu) on 2016-03-08T01:23:38Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) WenXianfei2016.pdf: 2049359 bytes, checksum: 363c5cb1144feae782940330c263c8b4 (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2016-03-11T21:34:38Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) WenXianfei2016.pdf: 2049359 bytes, checksum: 363c5cb1144feae782940330c263c8b4 (MD5)
  • description.provenance : Made available in DSpace on 2016-03-11T22:10:16Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) WenXianfei2016.pdf: 2049359 bytes, checksum: 363c5cb1144feae782940330c263c8b4 (MD5) Previous issue date: 2016-03-02

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