It is assumed that level of carbon-14 in the atmosphere is constant.
Geologists often need to know the age of material that they find.
Therefore, the half-life of a radioactive element is independent of the amount of sample.
Most absolute dates for rocks are obtained with radiometric methods.
These use radioactive minerals in rocks as geological clocks.
They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.
This is different to relative dating, which only puts geological events in time order.
The atoms of some chemical elements have different forms, called isotopes.
One of the interesting applications of radioactive decay is the technique of radioactive dating.
Radioactive dating allows the estimation of the age of any object which was alive once, using the natural radioactivity of .
It also allows the estimation of the age of geological samples using the decay of long lived nuclides.
All radioactive decays follow first order kinetics.