Fluorine and Nuclear Energy

Fluorine is used in the nuclear industries of many countries to make uranium hexafluoride for enrichment of uranium in the fissile isotope  

UFe is a solid (mp 64 °C) but has a high vapor pressure (15.3 kPa at 25 °C). Since F is the only stable isotope of fluorine, the only molecular species by mass in UFe are UFe and UFg. Repeated diffusion of UFe(g) through porous plugs (or centrifugation of the vapor) concentrates UFe relative to UFe, since the speed of diffusion varies inversely as the square root of the molecular mass. This enrichment is not needed for 

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