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When Rutherford announced his findings it soon became clear that Earth is millions of years old.

These scientists and many more after them discovered that atoms of uranium, radium and several other radioactive materials are unstable and disintegrate spontaneously and consistently forming atoms of different elements and emitting radiation, a form of energy in the process.

The original radioactive atom is known as a parent isotope, while the atom produced by the decay process is known as a daughter isotope. For example Uranium-235 and Uranium-238 are both Uranium atoms with the same number of protons, but they have a different number of neutrons.

The number used to identify the isotope refers to the total number of particles in the nucleus of each atom.

The severity of this problem decreases as the accuracy of our instruments increases.

Still, as a general rule, the proportional error in K-Ar dating will be greatest in the youngest rocks.

A second problem is that for technical reasons, the measurement of argon and the measurement of potassium have to be made on two different samples, because each measurement requires the destruction of the sample.

The majority of the time fossils are dated using relative dating techniques.Radioactive decay allows geologists and physicists to measure the age of ancient fossils, rocks and even the Earth.This process is called radiometric or radioactive dating.Radiometric dating is possible because the radioactive decay of large numbers of radioactive atoms follows a predictable pattern.This predictability allows scientists to measure the age of an object if they can work out how many radioactive atoms were originally present.The original atom is referred to as the parent and the following decay products are referred to as the daughter.