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fallout the radioactive particles that fall from a nuclear explosion.
plutonium a radioactive chemical element. Plutonium is used to produce nuclear energy. (symbol: Pu)
radiation the waves of energy sent out by sources of heat or light, or by radioactive material.
radium a silver-white, radioactive metal that is one of the chemical elements. Radium glows in the dark. It is used to treat cancer. (symbol: Ra)
radon a radioactive gas that is one of the chemical elements. It is found in small amounts in some soils and rocks. (symbol: Rn)
uranium a heavy, silver-white radioactive metal that is one of the chemical elements. It is used to produce nuclear energy. (symbol: U)