Is carbon dating really reliable Free bisex chat
Old samples contain much less C14, so the measured date of older samples is strongly affected by even small amounts of contamination.The third kind are dates which were measured before the 1970's.The C14 will undergo radioactive decay, and after 5730 years, half of it will be gone. So, if we find such a body, the amount of C14 in it will tell us how long ago it was alive. The method doesn't work on things which didn't get their carbon from the air.This leaves out aquatic creatures, since their carbon might (for example) come from dissolved carbonate rock.For example, Stonehenge suddenly became older than the Pyramids, instead of younger.Since then, several other calibrations have been done, which confirm and extend the tree-ring one.
And, we can date things that have been dated by some other method.
That causes a dating problem with any animal that eats seafood. After about ten half-lives, there's very little C14 left.
So, anything more than about 50,000 years old probably can't be dated at all.
In the 70's: If this sort of thing interests you, you should find the journal Radiocarbon and read one of the issues devoted to calibration.
For example, see Radiocarbon 46,1029 (2005), which has a calibration curve that goes back 26,000 years.
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We know (from other measurements) that the Sun hasn't fluctuated by more than 10 percent in the last million years.