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There is no instrument on earth that can detect Carbon-14 in a specimen that is supposedly older than 18 half-lives. There are, however, many false assumptions that must be made in order to derive Carbon-14 dates and the knowledge of these false assumptions demonstrates the uselessness in this other-wise supposedly useful not varied over the years. There is ample evidence to prove that quite the opposite is true.Experiments done with the radioactive isotopes of Uranium-238 and Iron-57 have shown that rates not only do vary, but can, in fact, be altered by changing the environment surrounding the samples.
In high school biology courses they often teach about the inevitable failures of closed systems by taking an aquarium and placing snails, plants and a bowl of water inside; then sealing the aquarium so that no air may get in or out.
The idea is that snails produce carbon dioxide which is utilized by the plants, the plants produce oxygen which utilized by the snails. Of course, it doesnt take long before the experiment fails in death for all those in the aquarium.
If this water vapor did exist in the past, then it would have effectively shielded the atmosphere from much of the cosmic radiation.
This shielding would have drastically reduced the amount of Carbon-14 produced.
The theoretical limit of the usefulness of Carbon-14 dating would only be 50,000 years.