[en] The technique of analytical calculations of electron impurity (π⁰→2γ, γ→e⁺e^-) in the secondary charged particle beams and hadron impurity in the conversion electron beams on the proton accelerators is considered. The practical useful relations describing quantitatively some general peculiarities of conversion electron beam formation by two-target technique are obtained. The computed results for the Serpukhov proton accelerator energies are compared with the experimental data. It is shown that conversion electron separation by beam collimating in the magnetooptical channel of proton accelerators can be resulted in hadron concentration decrease to the level Nsub(πsup(-))/Nsub(esup(-)) approximately 0.01