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X-Ray Cross Section Compilation from 0.1 KeV to 1 MeV.

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Page : 70 pages

File Size : 34,39 MB

Release : 1972

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Book Description

A search of the literature was made for the period from 1920 through June 1972, to obtain experimental x-ray cross sections for the elements in the energy range from 0.1 keV to 1 MeV. Total attenuation and photoelectric absorption data were evaluated and found not to be at variance with values reported in the compilation in the Final Report of this study. New experimental scattering data, along with earlier compiled experimental scattering data, were compared with theoretical values used in the compilation. Data are too scarce and errors are too large to evaluate the theoretical values unequivocally. Low energy theory was explored to determine whether changes in potential, or inclusion of relativistic or correlation effects could significantly improve calculated low energy cross sections. It was concluded that correlation effects would be most important.





X-Ray Cross Section Compilation from 0.1 KeV to 1 MeV. Discussion and Results. Volume I, Revision 1

Author : William J. Veigele

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Page : 229 pages

File Size : 40,90 MB

Release : 1971

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Book Description

Experimental x-ray attenuation cross sections for 94 elements between 0.1 keV and 1 MeV were obtained for the period from 1920 through 1970. Exact photoelectric absorption values also were calculated for hydrogen. Scattering cross sections were calculated by relativistic SCF methods. These were subtracted from total attenuation data, and the the resulting photoelectric and measured photoelectric absorption cross sections from 1 keV to 1 MeV were fit by a least squares procedure to obtain best values. Interpolations were made for elements and energy ranges for which there were no experimental data. From 0.1 keV to between 1 keV and 10 keV non-relativistic, self-consistent, independent electron theory was used to calculate photoelectric absorption cross sections. Scattering values were added to all photoelectric cross sections to obtain a best set of attenuation cross sections. (Author).



X-Ray Cross Section Compilation from 0.1 KeV to 1 MeV. Input Data and Supplemental Results. Volume II, Revision 1

Author : William J. Veigele

Publisher :

Page : 83 pages

File Size : 14,37 MB

Release : 1971

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Book Description

The report contains experimental data, theoretical values, and other information associated with the x-ray cross section compilation given in Volume 1 of this report. This material is not needed to use the cross sections, but is useful for understanding how they were obtained and for estimating their reliability. (Author).