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[QUOTE]Originally posted by Omega: [QB] On carbon 14: an organism takes it in as long as it's alive through the air it breaths. It decays at a certain rate, so the concentration in the tissues can't get higher than a certain point, assuming constant concentration in the air. Now once an organism stops breating, which usually leads to death, they stop taking in the carbon-14, which means that it will decay without being replaced. Thus by measuring the concentration of c-14 relative to the concentration that would normally be there in living tissue, it's possible to determine the time since the specimine ceased to inspire, or in other words, assumed room temperature. Of course, you have to assume a constant level of c-14 in the atmosphere throughout time, which is not supported by the evidence, so it really can't be relied upon TOO closely. [/QB][/QUOTE]
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