[en] A device for study of thermal neutron capture gamma-ray spectra using ²⁵²Cf neutron source has been developed. The device allows one to study both low-energy (E≤2 MeV) and high-energy (E≥2 MeV) neutron capture gamma-rays of nuclides and to develop methods for fast determination of element content of substance and materials, and also in dynamics and in streams. (author)