During study of cosmogenic background sources in EXO-200 experiment we obtained a list of 1689 isotopes, produced by passing of cosmic muons. Here we describe a method that allowed to estimate which isotopes from the list don't have a significant impact on a low-background data from the detector. Using this method we excluded more than 98~\% from the list with reasonable consumption of computing resources. This method might be useful in other cases of study of processes of material activation.
29.40.-n Radiation detectors
$^1$Alikhanov Institute for Theoretical and Experimental Physics
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