“…For the yield measurement for a natural mixture of isotopes the result is the yield of isotope production in all possible reactions on a The main disadvantage of beam experiments bremsstrahlung is that the yield of photonuclear reaction depends both on the studied cross section of the reaction σ(E) and the shape of the bremsstrahlung spectrum W(E, E γmax ), which is often known with insufficient accuracy. That's why the data obtained from the photonuclear experiment on bremsstrahlung beams are generally represented in terms of the relative yields or the integrated reaction cross section [33][34][35], the flux weighted average cross section <σ> [36][37][38][39][40][41][42][43], or the cross section per equivalent photon σ q [35,37,43,44].…”