1988/08/01 by F Biggs, R Lighthill · 1 voice · 1 citation
Materials Science · #Electron and X-Ray Spectroscopy Techniques #Radiation Shielding Materials Analysis #X-ray Diffraction in Crystallography
paper · doi:10.2172/7124946
openalex publication_date 1988/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
This report updates our previous work that provided analytical approximations to cross sections for both photoelectric absorption of photons by atoms and incoherent scattering of photons by atoms. This representation is convenient for use in programmable calculators and in computer programs to evaluate these cross sections numerically. The results apply to atoms of atomic numbers between 1 and 100 and for photon energiesgreater than or equal to10 eV. The photoelectric cross sections are again approximated by four-term polynomials in reciprocal powers of the photon energy. There are now more fitting intervals, however, than were used previously. The incoherent-scattering cross sections are based on the Klein-Nishina relation, but use simpler approximate equations for efficient computer evaluation. We describe the averaging scheme for applying these atomic results to any composite material. The fitting coefficients are included in tables, and the cross sections are shown graphically. 100 graphs, 1 tab.