THE COMPARISON OF BETA-CHANNEL LUMINOSITY WITH ALUMINUM ABSORBER FOR Sr-90 AND Cs-137 Babenko R.V., Bakovets N.V., Khadzhinov E.M. The presented work is giving up a volume of transport losses for isotopes Sr-90 and Cs-137 radiation in aluminum foils. It allows us to make an algorithm for data correction from bate-channel of Sr-90 detector. The algorithm bases on the parallel analysis of Sr-90 and Cs-137 spectrums, which come from beta-channel and gamma-channel at the same time. Up to this, the recovered information allows us to get some physical parameters of the target object, like its thickness and density.