By dating rocks of known ages which give highly inflated ages, geologists have shown this method can’t give reliable absolute ages.Many geologists claim that radiometric “clocks” show rocks to be millions of years old.All rely on the fact that certain elements (particularly uranium and potassium) contain a number of different isotopes whose half-life is exactly known and therefore the relative concentrations of these isotopes within a rock or mineral can measure the age.
It is founded on unprovable assumptions such as 1) there has been no contamination and 2) the decay rate has remained constant.
The half-life is the time it takes for half of the parent atoms to decay.
The relationship between the two is: T = 0.693 / λ Many different radioactive isotopes and techniques are used for dating.
The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes.
Radioactive decay is a natural process and comes from the atomic nucleus becoming unstable and releasing bits and pieces.