Criteria are analyzed for the selection of gamma-ray showers against the background of proton showers. The mechanism of criterion functioning is described in the primary energy range 30-100 TeV. The basis of a criterion capable of separating the two classes of events is formed by the integrals of the optical cascade curve over the characteristic altitude ranges which are obtained through the measured angular distribution of Cherenkov light of an extensive air shower. The conducted analysis gives way to further improvements of criteria for Cherenkov gamma-ray astronomy and the study of mass composition of the primary cosmic rays.
96.50.sd Extensive air showers
$^1$Umarov Physical-Technical Institute of Academy of Sciences of Tajikistan\
$^2$Department of Space Physics, Faculty of Physics, M.V.Lomonosov Moscow State University
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