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The flood buried a huge amount of carbon, which became coal, oil, etc., lowering the total C ratio in plants/animals/the atmosphere before the flood had to be lower than what it is now.
Unless this effect (which is additional to the magnetic field issue just discussed) were corrected for, carbon dating of fossils formed in the flood would give ages much older than the true ages.
The amount of the isotope in the object is compared to the amount of the isotope's decay products.
However, even with such historical calibration, archaeologists do not regard C produced and therefore dating the system.In summary, the carbon-14 method, when corrected for the effects of the flood, can give useful results, but needs to be applied carefully.It does not give dates of millions of years and when corrected properly fits well with the biblical flood.One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.
So, we have a “clock” which starts ticking the moment something dies.
It makes no sense at all if man appeared at the end of billions of years.