How is weapons-grade uranium-235 extracted out of uranium ore?

Uranium-235 is slightly lighter in mass than the remaining uranium ore. Separation techniques capitalize on this difference. For example, one method -- gas centrifuge enrichment -- spins gaseous uranium hexafluoride in cylinders, so the lighter uranium-235 moves toward the inner wall, where is it collected.

(For more information, see the Wisconsin Project "Bomb Facts: How Nuclear Weapons are Made," http://www. Wisconsinproject. More.

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