
Accession Number : AD0774445
Title : Constraints upon GrouptoGroup Scatter Coefficients Used with Transport Calculations.
Descriptive Note : Doctoral thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHTPATTERSON AFB OHIO SCHOOL OF ENGINEERING
Personal Author(s) : Webster,Joseph B. , III
Report Date : DEC 1973
Pagination or Media Count : 146
Abstract : A set of constraints was formulated to test the higher order coefficients of a Legendre polynomial expansion for the angular dependence of the differential cross section which describes the scattering of Xray energy photons with nonstationary electrons. Prior workers have developed numerical methods which generate these coefficients for both discrete and groupwise treatments of radiative energy transfer. Such coefficients were constrained to obey the principles of conservation of total cross section and detailed balance at equilibrium. This conservation principle provided a test only for the zero order coefficients to chance. By generalizing the conservation principle to apply to higher order coefficients, and providing the necessary values of averaged polynomials for given initial photon energies, the author developed a method for testing these higher order coefficients. (Modified author abstract)
Descriptors : *X rays, *Radiative transfer, Electron energy, Scattering cross sections, Compton scattering, Transport properties, Radiation hardening, Theses, Graphics
Subject Categories : Radioactiv, Radioactive Wastes & Fission Prod
Nuclear Physics & Elementary Particle Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE