Abstract
The polynomial chaos expansion technique is used to build surrogate models of the dependences of gamma-ray fluxes and neutron multiplication to unknown physical parameters in radiological source/shield systems. These surrogate models are used with the DiffeRential Evolution Adaptive Metropolis (DREAM), a method to solve and quantify uncertainty in inverse transport problems. Measured data in the inverse problems includes both passive gamma rays and neutron multiplication. The polynomial chaos expansion approach is shown to increase the speed of DREAM by factors of greater than 60 while not degrading the accuracy of the solution.
| Original language | English |
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| Title of host publication | 20th Topical Meeting of the Radiation Protection and Shielding Division, RPSD 2018 |
| Publisher | American Nuclear Society |
| ISBN (Electronic) | 9780894487460 |
| State | Published - 2018 |
| Event | 20th Topical Meeting of the Radiation Protection and Shielding Division, RPSD 2018 - Santa Fe, United States Duration: Aug 26 2018 → Aug 31 2018 |
Publication series
| Name | 20th Topical Meeting of the Radiation Protection and Shielding Division, RPSD 2018 |
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Conference
| Conference | 20th Topical Meeting of the Radiation Protection and Shielding Division, RPSD 2018 |
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| Country/Territory | United States |
| City | Santa Fe |
| Period | 08/26/18 → 08/31/18 |
Funding
Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).