Abstract

Total photon attenuation coefficients have been measured at seven energies in the range 30–660 keV for 18 elements and 29 compounds. From the results obtained on compounds, the total photon cross sections for certain elements are obtained applying the mixture rule. Direct measurements could be obtained on 18 elements. Atomic photo effect cross sections in medium and high Z elements in the energy range 30–280 keV are derived from all data by subtracting the relatively small scattering (coherent+incoherent) cross sections from the total atomic cross sections. They are compared with theoretical values.

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