Investigation of some processes of photonuclear reactions at low and intermediate energies

Generalized formulae for the determination of independent yields of radioactive nuclei forming in the targets via activation method are obtained. Various channels of isotopes formations are considered: immediately as a result of the reaction in the target and as products of the precursor decay. Certain cross sections of fission fragments, which are the result of the $\gamma^{_+{238}}U$ reaction under the bremsstrahlung maximal energy, are determined.