In the first chapter, Tatiana P. Pogrebnaya, Stanley F. Mwanga, and Alexander M. Pogrebnoi present a study where it was observed that the stability of the species related to the strength and number of bonds to be broken via detachment of CsX molecule. In the second chapter, a variety of cesium corrosion tests were performed on the FBR fuel cladding materials to explore the corrosion behavior on FBR cladding materials. In the third chapter, present a study finding that salmonids are effective monitoring animals concerning contamination of the marine ecosystems.