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Gold/Mining/Energy : Uranium Stocks

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From: Tommaso	12/9/2006 5:59:11 PM
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Lots here: geosurvey.state.co.us Including: A Natural Nuclear Reaction in Africa 1.7 Billion Years Ago In the early 1970s, scientists noted that something was strange about the uranium ore being mined at the Oklo deposit in Gabon, West Africa. The ore was depleted in the fissionable isotope of uranium, 235U, and resembled the percentage found in spent nuclear fuel-about 0.25–0.30 percent (it should have been 0.7 percent). At the time, this uranium deposit was formed (about 2,000 million years ago) the percentage of 235U was close to 3 percent, about the same as what is used in a modern nuclear reactor. Scientists think that water seeped into the deposit at about 1.7 billion years ago and allowed the neutrons emitted from uranium to slow enough to initiate a chain reaction, which then over time heated the water into steam causing the chain reaction to cease. This process may have happened numerous times until the amount of 235U was depleted enough to cause the cessation of the chain reaction. The products of the nuclear reaction remained within the Oklo deposit and were never dissolved or spread by ground water for 1.7 billion years. This fact gives scientists hope that nuclear waste stored in geological formations may be immobile for, at least, millions of years.

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