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The fraction of halo events among gamma-hadron families with SUM(Egamma) >500 TeV is analyzed. The comparison of experimental data and Monte-Carlosimulations by MC0 code of quark-gluon string model under various assumptionson the PCR mass composition suggests a slowly increasing contribution of nucleiheavier than protons and alpha-particles to PCR mass composition. Effectiveatomic number of PCR particles changes in the energy interval 10^15-10^17 eV sothat lnA grows from 2 to 2.5.

Proton Fraction in PCR Mass Composition at Energies of 10^15-10^17 eV (Experiment {\guillemotleft}Pamir{\guillemotright})