Atomic number dependence of the photoelectric cross section for photons in the energy range from 4.5 to 25 keV

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Abstract
Recent experimental values of total attenuation cross section and photoelectric cross section for the elements C, N, O, F, Ne, Mg, Al, Si, P, S, Cl, and Ar in the energy range from 4.5 keV to 25 keV, published by Millar and Greening (1974) are the first sufficiently comprehensive data set in this range to enable the smoothness of the functional relationship between photoelectric cross section and atomic number to be assessed. The experimental data suggest that the photoelectric cross section is a less smooth function of atomic number than of energy. Interpolated values of total attenuation cross section and photoelectric cross section for sodium are presented, with an assessment of the reliability of such interpolation techniques.