Since the beginning of the XX century, scientific and technological development in the nuclear field has led to extensive applications in research, medicine, industry and in the generation of electricity by nuclear fission. Collectively with numerous other human activities, these practices generate hazardous waste, or, specifically, radioactive waste. The most important challenge relates to the question “What is being done with radioactive waste?” Apparently, this type of waste requires special management in order to guarantee the safety and protection of all living organisms and the environment. The unique feature of radioactive waste lays in its very long isolation from humans and the environment until it no longer presents a danger and risk.