The interaction coefficients (fractions by weight or partial densities) and total attenuation coefficients
for any chemical compound or homogeneous mixture of shielding materials are obtained as weighted
sums over the corresponding coefficients for elements. The mass attenuation coefficients (μ / ρ ) can be
given by the following weighted summation:
= Σiμ / ρ wi (μ / ρ )i (1)
where ρ is the mass density of the sample and wi and (μ / ρ )i are the fraction by weight and mass
attenuation coefficient of ith constituent, respectively. The mass attenuation coefficients for total and