Abstract
Research studies, which are currently held in the field of radiation material science, can be divided into two main directions. First direction is connected with study of structure features and material properties, which were exposed to long-term high dose neutron radiation. These are generally high-performance constructional materials and fuel elements of commercial power nuclear reactors. Researches of this direction are aimed to determine physical reasons of material degradation under irradiation, often with unstable parameters. Second direction is connected with monitored irradiation of materials using big facilities such as research nuclear reactors, charge particle accelerators for analysis of change of materials' defect structure in order to forecast stability andor degradation of their properties (primarily, irradiation stability) after long-term irradiation.