Accession Number : AD0774445

Title :   Constraints upon Group-to-Group Scatter Coefficients Used with Transport Calculations.

Descriptive Note : Doctoral thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON 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 X-ray energy photons with non-stationary 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