# Half lives used carbon dating

The age of the rock can be calculated if the ratio of uranium to lead is known.As the rock gets older the proportion of lead increases.

The *carbon*-14 isotope would vanish from Earth's atmosphere in less than a million years were it not for the constant influx of cosmic rays interacting with molecules of nitrogen (NFigure 1: Diagram of the formation of *carbon*-14 (forward), the decay of *carbon*-14 (reverse).He demonstrated the accuracy of radiocarbon *dating* by accurately estimating the age of wood from a series of samples for which the age was known, including an ancient Egyptian royal barge *dating* from 1850 BCE.Before Radiocarbon **dating** was able to be discovered, someone had to find the existence of the C isotope.The accuracy of this proposal was proven by **dating** a piece of wood from an Ancient Egyptian barge, of whose age was already known.From that point on, scientist have **used** these techniques to examine fossils, rocks, and ocean currents and determine age and event timing.The technique of radiocarbon **dating** was developed by Willard Libby and his colleagues at the University of Chicago in 1949.

Emilio Segrè asserted in his autobiography that Enrico Fermi suggested the concept to Libby at a seminar in Chicago that year.

Libby estimated that the steady-state radioactivity concentration of exchangeable **carbon**-14 would be about 14 disintegrations per minute (dpm) per gram.

In 1960, Libby was awarded the Nobel Prize in chemistry for this work.

Using this finding Willard Libby and his team at the University of Chicago proposed that *Carbon*-14 was unstable and underwent a total of 14 disintegrations per minute per gram.

Using this hypothesis, the initial **half**-life he determined was 5568 give or take 30 years.

Plants absorb **carbon** dioxide from the atmosphere and animals eat plants.