The Uranium-238 reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Uranium-238

Uranium-238 is the most common isotope of uranium found. When hit by a neutron, it decays into neptunium-239, which then decays into its final product, plutonium-239, which is much more stable.

Depleted uranium is mostly composed of Uranium-238.

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