Radioactive wastes are wastes that contain radioactive material and are usually by-products of nuclear power generation and other applications of nuclear fission or nuclear technology, such as research and medicine. Radioactive waste is hazardous to human health and the environment and is regulated by government agencies. This book presents topical research in the study of the sources, types and management of radioactive waste, including DMNR real-time online monitoring of short and medium term radioactive waste; radioactive waste from research reactor operation and decommissioning; treatment of high-level radioactive waste arising from pyroprocessing and its waste form and highly radioactive waste disposal.