What is uranium dioxideperoxide?

Uranium dioxide peroxide (UO4) is a yellow to greenish-yellow crystalline powder that is a compound of uranium, oxygen, and hydrogen peroxide. It is a strong oxidizing agent and is found in nature as a uranium mineral. Uranium dioxide peroxide is used in the nuclear fuel industry as a fuel for reactors and as a precursor for other uranium compounds. It is also used in the production of nuclear weapons. Uranium dioxide peroxide is highly toxic and radioactive and should be handled with care. It is a major contributor of the radioactivity in spent nuclear fuel.