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Radiocarbon dating was invented in the 1950s by the American chemist Willard F.

Libby and a few of his students at the University of Chicago: in 1960, he won a Nobel Prize in Chemistry for the invention.

It is only reliable for calculating specimens younger than 60,000 years old due to the short half-life of C14.

After 1940 (when nuclear testing began) the levels of C14 were disrupted in the atmosphere making it very difficult to calculate the age of anything that has died after 1940. Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).

One of the most frequent uses of radiocarbon dating is to estimate the age of organic remains from archaeological sites.

Throughout the life of an animal or plant, the amount of C14 is perfectly balanced with that of its surroundings. The C14 in a dead organism slowly decays at a known rate: its "half life".

Radiocarbon dating is one of the best known archaeological dating techniques available to scientists, and the many people in the general public have at least heard of it.

But there are many misconceptions about how radiocarbon works and how reliable a technique it is.

The half-life of an isotope like C14 is the time it takes for half of it to decay away: in C14, every 5,730 years, half of it is gone.

So, if you measure the amount of C14 in a dead organism, you can figure out how long ago it stopped exchanging carbon with its atmosphere.

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