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There is then a ratio of Carbon-14 to Carbon-12 in the bodies of plants, animals and humans which could be considered as fixed at the time of death.After death, the Carbon-14 would decay and the ratio of the two isotopes would change.For some reason, which I have not yet figured out, at least one person per week has been asking me about the Carbon-14 Radiometric Dating Technique.They want to know if it is accurate or if it works at all.They all start with similar flaws, but Carbon-14 has more than the rest.The Carbon-14 dating method was introduced by Dr. Libby (1908-1980) at the University of Chicago in 1949. Carbon-12 is the normal stable isotope of Carbon (99% of all Carbon), which is the basic building block of organic life forms.Besides the aforementioned items, the amount of cosmic radiation in the past, and in particular the amount reaching the atmosphere, may have been dramatically different.If one were to believe the Bible, the earth was surrounded by a layer of water vapor between Creation and the Flood.
In a similar way, solar cosmic radiation fluctuates and would cause a fluctuation in the amount Carbon-14 being produced at any one an ongoing process.
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.