Pair production treatments for deterministic pulse-height distribution simulations Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z316q385n

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  • This thesis presents methods for treating annihilation photon pairs in deterministic pulse height distribution (PHD) simulations. The methods are applied in PHD simulations for monoenergtic sources of 1.6 and 2.6 MeV photons incident on 5 and 10 cm 1-D slabs of germanium, sodium iodide, and lead and the results are compared with PHD simulations generated using MCNP5. Comparisons show good agreement between the peak area estimates of the deterministic and Monte Carlo codes. Average relative error in peak area estimates compared to the MCNP5 benchmark was 7%. A new treatment for the distribution of energy deposition resulting from group-to-group transfer is introduced that provides limited improvement in resolution when compared to treatments used in previous work [1]. An iteration parameter study is also conducted on slab geometry systems composed of carbon, silicon, germanium, tin, lead, and lead sodium iodide of various thickness. The results indicate a maximum of approximately seven iterations required to converge transport solutions (>95% of escaping boundary current) for spatially uniform distributions of 0.511 MeV photons in 5 cm thick slabs.
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  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2011-10-10T20:37:08Z (GMT) No. of bitstreams: 3 MacQuiggMichaelR2011.pdf: 2653601 bytes, checksum: 02a3c6d1b866e3b5f4710f3c03e94d47 (MD5) license_rdf: 21624 bytes, checksum: b2f9d5b93b102f882cfbdd1fdd470543 (MD5) license_text: 23011 bytes, checksum: ffe7430ed236349ba7f7d7f911efd848 (MD5)
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Rejecting to change the bottom of the title page to read - Commencement June 2012. Once revised, open the item that was rejected. Replace the attached file with the revised file and resubmit. Thanks, Julie on 2011-10-07T19:07:15Z (GMT)
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