Bible and radiocarbon dating
Using tree rings, the calibration of carbon-14 has been extended back to ~4,760 B. Of course, they could all be wrong, but if enough independent studies agree with each other, then being wrong becomes a more remote possibility.
In addition to tree rings, scientists have looked at what are called lake varves in Northern Sweden.
(On the other hand, if you don't like puns, you might not.) So if you believe your assumptions, use good methods, what could go wrong?
Well, it turns out the problems with early carbon-14 were so severe, that many historians were on the verge of abandoning it.
A more difficult to deal problem with radiocarbon dating came from Egyptian and Mesopotamian artifacts when the dates were already known.
In Egypt, Assyria, Babylonia, and Sumeria, there are "king lists" of who reigned and for how long.
time can tell exactly how long ago the organism died. For any logical method, if the assumptions are right, and the reasoning is valid, then the conclusion is right. Carbon-14 dating assumptions ratio has never changed. Nothing but radioactive decay would alter the ratio in a dead plant or animal. We will look at the method first, and then the assumptions.
Finally American researchers did this with bristlecone pine trees in Arizona.Now clams take in ocean carbonate, which contains almost no C, so that it is no surprise today that a clam shell date appears ridiculously old.This phenomenon, now well understood, only gives ages that are "all wet" for some samples that have been in water for some time.All plants take in carbon from carbon dioxide in the atmosphere. A carbon-14 atom is radioactive; it eventually loses an electron and a neutrino and changes to nitrogen-14.
Its half-life is 5,730 30 years, so it never has nor can be used to date carbon samples millions of years old.
So if one does these three steps: prepare a valid sample well, run the test correctly, and read the right calibration, the date should be good.