[en] The results of experimental determining the values of thermal cross sections and resonance integrals for ₂₃₀Th, ₂₃₁Pa, ₂₃₆U, ₂₃₇Np are presented. The measurements have been performed by the activation method. As a standard ₂₃₂Th has been used. The sample irradiation has been carried out at the TBP reactor. The experimental channel location scheme is given. ν quanta detection has been realized by means of semi-conductor detectors of coaxial Ge-Li detector and super-pure Ge x ray detector. The measuring apparatus structure scheme flowsheet is shown. For ₂₃₁Pa and ₂₃₇Np resonance integral values are obtained depending on the cadmium filter thickness. The value of the cross section of radiation thermal neutron capture by ₂₃₂Pa, average by thermal neutron spectrum, and the resonance integral value of this nuclide are given