“…where I 1 , I 2 , I 3 -intensities of the primary radiation as registered by the sensor within the given volume in the presence of adsorbing material for, correspondingly, the 1 st , the 2 nd and the 3 rd sites of the pipeline cross-section; ρ st , ρ i , ρ p -densities of the pipeline steel wall, ice and pulp correspondingly; δ st , δ i , δ p -equivalent thickness of the pipeline steel wall, ice and pulp phase, correspondingly, μ st , μ i , μ p -mass attenuation coefficient for the primary radiation by the pipeline steel wall, ice and pulp flow, correspondingly; with Δ -the distance between the pipeline edge and the point of scanning at the moment by direction of motion for the entire measuring system; R, r -outer and inner radii of the pipeline in the section given; D -the pipeline diameter [4].…”