Irradiation with ions and electrons provides accelerated study of radiation damage in nuclear materials, such as those proposed for immobilization of actinides and long-lived fission products. The effects of ion irradiation in SrTiO 3 , Sm 2 Ti 2 O 7 and Sr 2 Nd 8 (SiO 4 ) 6 O 2 , as representative materials, are studied using 1MeV Au + ions. The irradiation-induced disorder, due to atomic collisions processes, increases nonlinearly with irradiation dose and is well described by a disorder accumulation model that includes contributions from amorphous domains, point defects and defect clusters. Ionization from 200keV electrons induces recrystallization at the amorphous/crystalline (a/c) interface that exhibits several distinct stages associated with residual defect annihilation near the interface, epitaxial regrowth at the interface and a surface-stabilized amorphous state. Understanding ionization effects and the coupled effects of electronic and atomic dynamics on material behavior is a challenging area for scientific research.