Age of the Earth - Radiometric Equations - Isochrons Explained

The radiometric equations given here provide theoretical details of the construction of isochrons. Please refer to the main article for background information.  This part may be skipped without loss of continuity in the main article. 

In an actual radiometric analysis to determine the age of a sample, it is necessary to measure the abundance of the parent and daughter isotopes and also we need to know how much of these isotopes were present at the time of formation of the sample. How these abundances are related to the elapsed time (age of the sample) is determined by radiometric equations.

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