Skip navigation
Nuclear Safeguards Education Portal
  

Natural uranium

Uranium as it occurs in nature, having an atomic weight of approximately 238 and containing minute quantities of 234U, about 0.7% 235U and 99.3% 238U. Natural uranium is usually supplied in raw form by uranium mines and concentration (ore processing) plants as uranium ore concentrate, most commonly the concentrated crude oxide U3O8, often called yellow cake.