Two types of radiometric dating
In other words, we can say that in relative dating the archaeologist determines that which of the two fossil or the artifacts are older.
Contrary to this, absolute dating is the technique, using which the exact age of the artifacts, fossils, or sites are ascertained.
As the word relative tells that defining the object with respect to the other object, it will be pertinent to mention here that actual numerical dates of the rocks or sites are not known in this type of dating.
They use absolute dating methods, sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.The atoms of some chemical elements have different forms, called isotopes.These break down over time in a process scientists call radioactive decay.Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.Each isotope is identified with what is called a ‘mass number’.
All radiometric dating methods measure isotopes in some way.