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The New Zealand physicist Ernest Rutherford, suggested in 1905 that the exact age of a rock could be measured by means of radioactivity.

For the first time he was able to exactly measure the age of a uranium mineral.

decay or the rate of other cumulative changes in atoms resulting from radioactivity. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number..

The realisation that radioactive materials emit rays indicated a constant change of those materials from one element to another.

Over the second half-life, of the atoms remaining decay, which leaves of the original quantity, and so on.

In other words, the change in numbers of atoms follows a geometric scale as illustrated by the graph below.other carbon isotopes in the same ratio as exists in the atmosphere.

Although, organic materials as old as 100,000 years potentially can be dated with AMS, dates older than 60,000 years are still rare.

Paleoanthropologists and archaeologists must always be aware of possible radiocarbon sample contamination that could result in inaccurate dates.