The book has been divided into three parts. Part I (Radiation Science) is the enabling part covering radiation, biological effects of radiation, radiological protection, and statistical methods. These subject matters are used and referred to throughout the rest of the book. Part II incorporates the whole aspect of decommissioning, project management, safety aspects, environmental impact assessment, decontamination and dismantling techniques etc. The last part includes radioactive waste management covering regulatory aspects, treatment and conditioning, storage and transportation, waste disposal etc.