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When something dies, it no longer assimilates C14, at least not by the means described above. To test the assumption, the rate that C14 forms in Earth’s atmosphere was estimated (based on measurements from various locations around the globe). The testing indicated that C14 is forming faster than it is decaying.If an artifact is preserved from physical decay and leaching of chemicals, radioactivity may be the sole means whereby it gradually loses its C14. A simple analogy may be helpful: Suppose water is steadily dripping into a large tub.They are: (1) the C14 concentration in a specimen at its time of death; (2) the decay rate of C14; (3) the current C14 concentration in the specimen being “dated”; and (4) if anything else has affected the specimen’s C14 content. The curved line represents the declining amount of C14 atoms over time due to radioactive decay.Note: only the third of those four necessary facts can be measured, the other three must be estimated, assumed, or extrapolated. During each half-life (~5,730 years), about half of the remaining C14 atoms in a specimen are expected to decay.Indeed, experiments have led to a startling conclusion: that C14 levels in the past were lower than they are now.If the experimental data was correctly collected and interpreted, Libby’s assumption in estimating the original content is wrong.

Carbon-14 is rare, Plants are eaten by animals, and living things on Earth become ever-so-slightly radioactive due to ingesting things containing C14. When they strike atoms in the atmosphere, chain reactions occur, some of which result in free neutrons (n) that readily react with nitrogen-14 to form C14.Measuring the current levels of C14 in a specimen is—by far—the most precisely determinable of the four essential facts.With the advent of AMS technology, and the less-precise technique is often employed.Radioactive decay causes once-living specimens to lose half of their C14 atoms in about each 5,730-year half-life.Thus, if the level today is half of what it was estimated to be when the thing died, it is said to be 5,730 years old.




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