抄録
Effect of neutron irradiation on materials to a high fluence is important for advanced energy systems as fast breeder or fusion reactors. Two major features of fast neutron irradiation effects are high energy cascade effect and the effect of nuclear transmutations. In this paper, recent progress on the cascade damage is reviewed. The discussions include structure of the cascade, depending on the mass and energy of incoming particles or PKAs, formation and stability of the cascade defects, effects of the cascade on free defect and clustered defect formation and on the defect survival, characteristic phenomena of the cascades. Future directions to establish irradiation correlation are discussed. Emphasis is placed on the importance of establishing damage analysis methodology based on PKA energy spectrum.
