It cannot be used to date volcanic rocks, for example.
This of course contradicts claims that the Great Flood messed up how carbon was deposited, destroying their own argument.
Less astute creationists often conflate carbon dating with other forms of radiometric dating, attempting to "disprove" the true age of dinosaur fossils by "refuting" carbon dating.
This is the “half-life.” So, in two half-lives, or 11,460 years, only one-quarter of that in living organisms at present, then it has a theoretical age of 11,460 years.
Anything over about 50,000 years old, should theoretically have no detectable C.
So, we have a “clock” which starts ticking the moment something dies.