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Author Topic:   Helium in the atmosphere. Evidence for or against a young earth?
Chiroptera
Inactive Member


Message 10 of 24 (244091)
09-16-2005 8:26 AM
Reply to: Message 9 by christ_fanatic
09-16-2005 6:44 AM


Re: Very Interseting.
quote:
...but you see my point.
Actually, I don't see your point. I wonder, though, whether the Oklo reactors are relevant to your point?

This message is a reply to:
 Message 9 by christ_fanatic, posted 09-16-2005 6:44 AM christ_fanatic has replied

Replies to this message:
 Message 11 by christ_fanatic, posted 09-16-2005 1:28 PM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 12 of 24 (244165)
09-16-2005 1:43 PM
Reply to: Message 11 by christ_fanatic
09-16-2005 1:28 PM


Re: Very Interseting.
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.

This message is a reply to:
 Message 11 by christ_fanatic, posted 09-16-2005 1:28 PM christ_fanatic has replied

Replies to this message:
 Message 13 by christ_fanatic, posted 09-16-2005 1:45 PM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 14 of 24 (244168)
09-16-2005 1:48 PM
Reply to: Message 13 by christ_fanatic
09-16-2005 1:45 PM


Re: Very Interseting.
Enough to know that their results have been refuted.

This message is a reply to:
 Message 13 by christ_fanatic, posted 09-16-2005 1:45 PM christ_fanatic has replied

Replies to this message:
 Message 15 by christ_fanatic, posted 09-16-2005 2:14 PM Chiroptera has replied
 Message 20 by christ_fanatic, posted 09-16-2005 9:10 PM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 17 of 24 (244193)
09-16-2005 3:41 PM
Reply to: Message 15 by christ_fanatic
09-16-2005 2:14 PM


Re: Very Interseting.
Did the link I supply not deal with the results to which you are referring? If not, specify which results you find interesting; perhaps I or someone more knowledgeable than I can find more information on it.

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 Message 15 by christ_fanatic, posted 09-16-2005 2:14 PM christ_fanatic has not replied

  
Chiroptera
Inactive Member


Message 21 of 24 (244256)
09-16-2005 9:44 PM
Reply to: Message 20 by christ_fanatic
09-16-2005 9:10 PM


Interest is waning.
Hello, christ_fanatic.
The link I supplied earlier has a side-bar, at the beginning, that mentions this particular "refutation" by Humphreys.

This message is a reply to:
 Message 20 by christ_fanatic, posted 09-16-2005 9:10 PM christ_fanatic has replied

Replies to this message:
 Message 22 by christ_fanatic, posted 09-18-2005 3:20 PM Chiroptera has replied

  
Chiroptera
Inactive Member


Message 24 of 24 (244661)
09-18-2005 3:38 PM
Reply to: Message 22 by christ_fanatic
09-18-2005 3:20 PM


Re: Interest is waning.
JonF has already answered this. The only thing I will add is a link to a short explanation of Gentry's polonium halos.

This message is a reply to:
 Message 22 by christ_fanatic, posted 09-18-2005 3:20 PM christ_fanatic has not replied

  
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