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Author Topic:   Carbon 14 in fossils?
Chiroptera
Inactive Member


Message 21 of 40 (221736)
07-04-2005 7:29 PM
Reply to: Message 20 by JonF
07-04-2005 7:12 PM


quote:
It is not possible that all radiometric age determinations are tremendously wrong, as the YECs would have us believe.
Actually, what YECs would have us believe is that geologists get many different dates for the same units and choose the one date that conforms to their pre-existing biases.

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 Message 20 by JonF, posted 07-04-2005 7:12 PM JonF has replied

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Chiroptera
Inactive Member


Message 31 of 40 (455326)
02-11-2008 9:46 PM
Reply to: Message 30 by Jason777
02-11-2008 9:28 PM


That diamond dated 58,000 years old.If something dates 5,800 years old is that 1/10 background level?
No.

If I had a million dollars, I'd buy you a monkey.
Haven't you always wanted a monkey?
-- The Barenaked Ladies

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Chiroptera
Inactive Member


Message 38 of 40 (455897)
02-14-2008 1:13 PM
Reply to: Message 30 by Jason777
02-11-2008 9:28 PM


In fact, here's the math.
In a radioactive sample, the signal (the amount of radioactivity) that is measured is going to be given by
A = A0e-kt/5730,
where A0 is a constant related to the amount of C14 that was initially present, and k is the natural log of 2. If we assume that the same amount of C14 is always initially present in every sample (in real life this isn't true, but shouldn't affect the results here by more than an order of magnitude or so), then we have
diamond: Ad = A0e-k58000/5730
something else: Ase = A0e-k5800/5730
Thus, dividing:
Ase/Ad = ek(58000-5800)/5730
=ek52200/5730
=e9k
=512
Thus, the something else in your example has 512 times the signal of the diamond.
Hope this helps.
Edited by Chiroptera, : Forgot the correct factor in the exponent.

If I had a million dollars, I'd buy you a monkey.
Haven't you always wanted a monkey?
-- The Barenaked Ladies

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