Photon Buildup Factors in Laminated Dual-Layer Shields

Dual Layer Buildup Factors;Photon Buildup;Radiation Shielding;Radiation Protection

Davis, Adam ; Dr. David N McNelis, Committee Member,Dr. John Franke, Committee Member,Dr. Man-Sung Yim, Committee Chair,Dr. Donald J. Dudziak, Committee Member,Davis, Adam ; Dr. David N McNelis ; Committee Member ; Dr. John Franke ; Committee Member ; Dr. Man-Sung Yim ; Committee Chair ; Dr. Donald J. Dudziak ; Committee Member

University:North Carolina State University

关键词: Dual Layer Buildup Factors;    Photon Buildup;    Radiation Shielding;    Radiation Protection;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/1790/etd.pdf?sequence=1&isAllowed=y

美国|英语

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【 摘 要 】

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.