Accession Number : ADD095374

Title :   Comparison of Theoretical and Experimental Photoeffect Data 0.1 keV to 1.5 MeV.

Descriptive Note : Technical note,

Corporate Author : NATIONAL STANDARD REFERENCE DATA SYSTEM

Personal Author(s) : Hubbell, J H ; Veigele, Wm J

Report Date : Apr 1976

Pagination or Media Count : 46

Abstract : Graphs of calculated and experimental atomic photo-effect cross sections as a function of photon energy 0.1 keV to 1.5 MeV are presented for all elements Z = 1 to 94. The calculated results presented are (a) the nonrelativistic Hartree-Fock self-consistent-field (SCF) results of Veigele, Henry, et al., over the range 0.1 keV to between 1.0 and 8.0 keV for all elements Z = 1 to 94 and (b) the relativistic Hartree-Slater SCF results of Scofield over the range 1.0 keV to 1.5 MeV for all elements Z = 1 to 101. The 'experimental' data-points are derived by subtracting theoretical scattering cross sections from total attenuation coefficient measurements in the literature. Differences between theoretical and experimental photoeffect data are typically a factor of two from 0.1 to 1.0 keV, 5-10% from 1.0 to 5.0 keV and 1-5% from 5.0 keV up to energies, ranging from 20 keV for carbon up to 500 keV for lead, above which the photoeffect cross section becomes fractionally too small to be accurately determined from the total attenuation coefficient. (Author)

Descriptors :   *PHOTONS, *ABSORPTION CROSS SECTIONS, *PHOTOELECTRIC EFFECT, *COEFFICIENTS, *TABLES(DATA), GAMMA RAYS, X RAYS, DATA ACQUISITION, EXPERIMENTAL DATA, ATTENUATION, ATOMIC SPECTRA, ELECTRONS, RADIATION, ULTRAVIOLET RADIATION, ELECTROMAGNETIC SPECTRA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE