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Professor Willard Libby produced the first radiocarbon dates in 1949 and was later awarded the Nobel Prize for his efforts.

Radiocarbon dating works by comparing the three different isotopes of carbon.

I understand how radioactive dating works, but something about it concerns me. If we have a rock and assume that it was 100% carbon-14 at formation, and we now measure it to be 25% carbon-14 and 75% nitrogen-14 (I know nitrogen is a gas, but bear with me), then we can calculate that the rock has been around long enough to pass through 2 half-lives (2 x 5,730 years = 11,460 years). If, in fact, the rock was 50% carbon-14 and 50% nitrogen-14 at its formation, then it would actually be only 5,730 years old (only half the originally calculated age).

This measurement seems to hinge on the fact that we know that the rock was originally 100% carbon-14.

Firstly, we don't use carbon dating for measuring the age of rocks; carbon dating would only be used for the remains of living matter (e.g. Other radioactive isotopes might be used for various other objects.

When we date something based of radioactive decay, we rely on some mecahanism that sets the ratio of isotopes to some predetermined value.

The percentage of Carbon 14 becomes extremely small and difficult to measure.

To see them, please REGISTER or LOGINOne of the most widely used and well-known absolute dating techniques is carbon-14 (or radiocarbon) dating, which is used to date organic remains.The total mass of the isotope is indicated by the numerical superscript.While the lighter isotopes C has decayed that what remains can no longer be measured. In 5,730 years half of the C in the atmosphere, and therefore in plants and animals, has not always been constant.Rachel Wood does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.Australian National University provides funding as a member of The Conversation AU.




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