Accession Number : AD0779941
Title : The Effect of an Air/Ground Interface on Fluence from a Plane Source of Neutrons in Homogeneous Air.
Descriptive Note : Master's thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
Personal Author(s) : Fredrickson,Frank N.
Report Date : MAR 1974
Pagination or Media Count : 69
Abstract : A numerical approximation of the multigroup diffusion equation was used to evaluate fluence from a plane source of neutrons in a homogeneous air environment with an air/ground interface. Data from the air/ground model were compared with data from an infinite homogeneous air model to determine the effect of the air/ground interface on the total neutron fluence in the air. This simple model indicates that the ground acts as a neutron sink for all 22 neutron energy groups studied. Based on this result, a set of modifications to the AFIT Nuclear Survivability Code was recommended to extend the useful range of that code below seven km. (Author)
Descriptors : *Neutron flux, *Nuclear weapons, *Weapons effects, Air, Diffusion, Neutron cross sections, Computer programs, Survival(General), Theses
Subject Categories : Radioactiv, Radioactive Wastes & Fission Prod
Nuclear Physics & Elementary Particle Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE