The irradiation of materials with energetic particles has significant effects on the properties of target materials. In addition to the well-known detrimental effects of irradiations, they have also some beneficial effects on the properties of materials. Irradiation effect can change the morphology of the materials in a controlled manner and tailor their mechanical, structural, optical and electrical properties. Irradiation induced modifications in the properties of materials can be exploited for many useful applications. This 2nd volume on Radiation Effects considers the importance of Radiation Induced Modifications of Materials. It includes 9 Papers written by experts in this field on a variety of subjects.