Radioactive waste comes from nuclear power and technology and includes low, intermediate, high, and very low level waste. France manages radioactive waste through sorting, treatment, storage, and disposal. Sorting separates waste by properties and reduces volume. Treatment includes incineration, cementation, and vitrification to seal waste in containers. Storage facilities hold waste temporarily while disposal is the final placement without intention of retrieval. Vitrification immobilizes high level waste by incorporating it into glass, providing a durable solid form for long-term storage. Methods of radioactive waste disposal include above ground dry cask storage, geologic repositories hundreds of meters underground, reuse of some isotopes, and potential space disposal though this has disadvantages.