quote:
My point any way was that the earth would be irradiated extremely.
If by "extremely" you mean "somewhat more than at present" then you would be correct.
The Oklo reactors are an interesting natural phenomenon. Modern fission reactors rely on a certain isotope of Uranium, U-235. Most uranium ores are mostly the relatively useless U-238, and so must be extensively processed in order to get increased U-235. But the half-life of U-235 is much shorter than U-238, so that it decays faster. So as time goes on, the proportion of U-235 must decrease in a given sample of ore.
This means that as we backwards in time, the relative proportion of U-235 must increase. About 2 billion years ago, about 3% of uranium in a typical sample would have been U-235 -- which is enough to sustain a fission reaction, like in modern reactors, if the conditions were right. In
western Africa, there are the remains of uranium ore bodies with anomalous characteristics -- characteristics that can be explained if the conditions at these locations were just right for a sustained fission reaction.
So, the Oklo reactors are the remains of a
naturally occurring nuclear reactor.