[templar]

Would enriched uranium rods still be useful for weapons after 39 years?

[MikeD]

They should be -- U-235 has a half life of around 700 million years. In other words, if you have 10 pounds of U-235, in 700 million years you expect to have around 5 pounds of U-235 and 5 pounds of other material (decay products).

MD