Photon Buildup Factors in Laminated Dual-Layer Shields
Title: | Photon Buildup Factors in Laminated Dual-Layer Shields |
Author: | Davis, Adam |
Advisors: | Dr. David N McNelis, Committee Member Dr. John Franke, Committee Member Dr. Man-Sung Yim, Committee Chair Dr. Donald J. Dudziak, Committee Member |
Abstract: | In radiation protection, photon buildup factors provide a convenient method for calculating dose and exposure response after various shielding configurations, as well as information about the behavior of radiation in these configurations. Though many situations call for multi-layer shields, few data bases and derived analytical formulas for photon buildup in multi-layer shields exist. This research develops buildup factors and an analytical fit to these for dual-layer shields of various materials.The photon buildup factors were calculated for two-layer shields of various combinations of lead, polyethylene, aluminum and stainless steel for thicknesses of 2-20 mean free paths using the discrete-ordinates code PARTISN. The Gauss-Lobatto S100 quadrature was used with a 244-energy-group structure and coupled photon and electron cross sections. These were then benchmarked for representative cases using MCNP5 and fit to a new analytical formula using Mathematica 6.0. |
Date: | 2007-12-07 |
Degree: | MS |
Discipline: | Nuclear Engineering |
URI: | http://www.lib.ncsu.edu/resolver/1840.16/1790 |
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