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 Weapons
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE