However, as shown in Figs. 6 and 7, theoretical and experimental data exhibit similar tendency and ‘‘foam + water” samples show higher mass attenuation coefficients. Since the mass attenuation coefficients already consider the density factor, a conclusion can be made that the ‘‘foam + water” samples have better attenuation from the point of benefiting weight saving. At the present energies, the attenuation of the incident beam is determined mainly by Compton scattering.
It is indicated by tabulated XCOM data that Compton scattering contribute more than 99% of the total interaction
cross-section at the present three energies.