Geological dating radioactive elements 7 day dating and relationship
The vast majority of atoms (each composed of a nucleus surrounded by electrons) are stable. Because of this particle emission, the original radioactive parent atom changes its identity, becoming a different, stable daughter atom.
This change takes place at a known rate determined by the half-life; ie, the time required for one-half of the original number of radioactive atoms to convert to the stable daughter product.
Since 1950, radiometric methods have been developed to a very sophisticated level in several countries, including Canada.
It has been demonstrated that when rocks which have led an undisturbed history are analysed, all methods reveal the same age.
The existence of radioactivities of various kinds in rocks has enabled earth scientists to determine the age of the Earth, the moon, meteorites, mountain chains and ocean basins, and to draw up a reasonably accurate time scale of evolution.
The remaining number of radioactive atoms is halved every half-life.
Radioactive elements of use in geological dating have relatively long half-lives.
Two approaches have been developed to circumvent these problems.
The first involves sampling as much of the Earth's crust as possible and dating these rocks.