Influence of Primary Cosmic Radiation Mass Composition on the Estimation   of Eas Energy
  At the Yakutsk EAS array E_em is determined by using measurements of EAS Cherenkov light flux and charged particle flux. It is known from calculations that these characteristics depend on a sort of primary particle and, therefore, the estimation of E_em depends on a primary particle mass. In the work the dependence of the E_em/E_0 ratio on the energy is given and experimental data are compared with calculations by the QGSJET model. The calculations have been carried out for the primary proton and iron nucleus. The average calculated meaning of the value of E_em/E_0 ratio (between the proton and iron nucleus) within experimental errors is in agreement with experimental data that doesnt contradict to the mixed mass composition of primary cosmic radiation. 
S.P. Knurenko, A.A. Ivanov, V.A. Kolosov, Z.E. Petrov, I.Ye. Sleptsov,   G.G. Struchkov