Abstract
For elements from H to Pu, experimental photon attenuation cross sections from 0.1 keV to 1 MeV were compiled from literature available to the end of 1970. Scattering cross sections, calculated by relativistic self-consistent-field methods, were subtracted from total attenuation data, and the resulting photoelectric and measured photoelectric cross sections from 1 keV to 1 MeV were fitted by a least-squares procedure. The theoretical scattering cross sections were then added to the resulting values to obtain totalattenuation coefficients. From 0.1 keV to between 1 keV and 10 keV, non-relativistic, self-consistent-field, independent-electron theory was used to calculate photoelectric cross sections. Theoretical scattering values were addedto obtain total attenuation cross sections. The two sets of values comprise our recommended cross sections. In cases of overlap, the calculated values are to be preferred. Uncertainties were estimated.
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