Accession Number : AD0761197

Title :   Comparison of Photon Interaction Cross Data Sets. VI. McGuire and Kaman Photoeffect Data.

Descriptive Note : Interim rept. Jan-Mar 73,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON D C

Personal Author(s) : Simmons,G. L. ; Hubbell,J. H.

Report Date : MAY 1973

Pagination or Media Count : 44

Abstract : Photoeffect cross sections calculated by McGuire, covering the energy range 0.0062 to 62.0 keV for elements with z = 2 to 54, are compared with values interpolated from results calculated by Veigele et al (Kaman) which cover the energy range 0.1 to between 1.0 and 8.0 keV. This comparison is presented in the form of percent differences between these two data sets, with the Kaman values taken as the reference set. The cross sections are listed and the differences are tabulated over the energy range 0.103 to 62.0 keV, thus at the higher energies the comparison is with Kaman values which were fitted to experimental data. Discrepancies ranged from less than 3% up to as much as a factor of ten in the iodine MIV - MV edge region at 0.620 keV. From this comparison, and from graphical comparison of both sets with experimental data for carbon, aluminum and tin, the authors estimate that for Z = 2 to 54 the envelop of uncertainty of the Kaman calculated values in the region 0.1 to 1.0 keV is of the order of plus or minus 20% except in the presence of resonance absorption features where the uncertainty can be an order of magnitude. (Author)

Descriptors :   (*CHEMICAL ELEMENTS, *PHOTON BOMBARDMENT), (*ATOMS, PHOTON BOMBARDMENT), TABLES(DATA), SCATTERING, DIFFERENTIAL CROSS SECTIONS, EXPERIMENTAL DATA, CARBON, TIN, ALUMINUM

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE