Photon Buildup Factors in Laminated Dual-Layer Shields

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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

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