This of course presupposes that radiometric dating works consistently as a dating technique in the first place. The basic equation of radiometric dating requires that neither the parent nuclide nor the daughter product can enter or leave the material after its formation. The equation is most conveniently expressed in terms of the measured quantity N t rather than the constant initial value N o. There are different methods of radiometric dating. Middle School Earth Science:
The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.
Retrieved 6 April Teachers Love Study. An unstable isotope spontaneously emits radiation from its atomic nucleus. Want to learn more? A clastic sedimentary rock is made up of older rock and mineral fragments, and when the rock forms it is almost certain that all of the fragments already have daughter isotopes in them. Potassium has a half-life of 1.