Uranyl Fluoride

Source: Appendix A of the PEIS (DOE/EIS-0269)

Physical Properties

Uranyl fluoride (UO₂F₂) is an intermediate in the conversion of UF₆ to an uranium oxide or metal form and is a direct product of the reaction of UO₂F₂ with moisture in the air. It is very soluble in water. Uranyl fluoride also is hygroscopic and changes in color from brilliant orange to yellow after reacting with water. Uranyl fluoride is reported to be stable in air to 570°F (300°C), above which slow decomposition to U₃O₈ occurs. When heated to decomposition, UO₂F₂ emits toxic fluoride fumes.

Chemical Properties

Uranyl fluoride (UO₂F₂) is a yellow hygroscopic solid that is very soluble in water. In accidental releases of UF₆, UO₂F₂, as a solid particulate compound, may deposit on the ground over a large area.