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Carbon-14, described by Argonne National Laboratory, is produced in Earth’s atmosphere when N-14, Nitrogen, from New World Encyclopedia, atoms are bombarded by cosmic rays from space. It is very difficult to date organisms less than 1,000 years old because there is too much carbon-14 present.

They collide with the N-14 atoms and convert them into C-14 atoms. The C-14 then combines with oxygen to form carbon dioxide, CO-2. All living things are replacing their carbon-14 as they continue living. The same problem happens on the other end of the spectrum when an organism is older then 50,000 years, when there is not enough carbon-14 to measure. “At first there were very few who believed in the existence of these bodies smaller than atoms.

This technique is not restricted to bones; it can also be used on cloth, wood and plant fibers. The short half-life of carbon-14 means its cannot be used to date extremely old fossils.

Carbon-14 dating has been used successfully on the Dead Sea Scrolls, Minoan ruins and tombs of the pharohs among other things. Levels of carbon-14 become difficult to measure and compare after about 50,000 years (between 8 and 9 half lives; where 1% of the original carbon-14 remains undecayed).

It will decay, or emit radiation, over a long period of time at a near consistent rate.

The rate of decay, which can be measured, is 5,730 years equals one half-life.

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The half-life of a radioactive isotope describes the amount of time that it takes half of the isotope in a sample to decay.

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).

When an organism dies it ceases to replenish carbon in its tissues and the decay of carbon 14 to nitrogen 14 changes the ratio of carbon 12 to carbon 14.

Experts can compare the ratio of carbon 12 to carbon 14 in dead material to the ratio when the organism was alive to estimate the date of its death.




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