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Carbon-14 is created from nitrogen-14 in the upper atmosphere of the earth.
Radiation from the sun collides with atoms in the atmosphere.
Carbon dating is used to determine the age of biological artifacts up to 50,000 years old.
This technique is widely used on recent artifacts, but teachers should note that this technique will not work on older fossils (like those of the dinosaurs which are over 65 million years old).
Seek and ye shall find: creationists boldly go where no evolutionists have gone before.
With the recent announcement of soft tissue in off-the-shelf dinosaur bones (6/09/15, 6/10/15), complete with enriched carbon, the obvious question is: does any of it contain carbon-14?
Nuclear tests, nuclear reactors and the use of nuclear weapons have also changed the composition of radioisotopes in the air over the last few decades.
This human nuclear activity will make precise dating of fossils from our lifetime very difficult due to contamination of the normal radioisotope composition of the earth with addition artificially produced radioactive atoms.
However, the decaying carbon-14 is constantly being replaced as the plant or animal consumes more carbon-14 from the air or through its food.Also, many fossils are contaminated with carbon from the environment during collection or preservation proceedures.