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A Pentagon official who asked not to be named said that third country was Diego Garcia, a British territory in the Indian Ocean where the United Kingdom and the United States operate a joint military base.From that third country, Whitman said, the containers were loaded onto the SS Gopher State, a U.Uranium-238 decays by alpha emission into thorium-234, which itself decays by beta emission to protactinium-234, which decays by beta emission to uranium-234, and so on.The various decay products, (sometimes referred to as “progeny” or “daughters”) form a series starting at uranium-238.Uranium is the principal fuel for nuclear reactors and the main raw material for nuclear weapons.

But for the sprawling sphere we call home, age is a much trickier matter.

Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.

There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

First discovered in the 18th century, uranium is an element found everywhere on Earth, but mainly in trace quantities.

In 1938, German physicists Otto Hahn and Fritz Strassmann showed that uranium could be split into parts to yield energy.

The shipment, which until recently was kept secret, involved a U. truck convoy, 37 cargo flights out of Baghdad to a transitional location, and then a transoceanic voyage on board a U.

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