Radioactive dating rock
By definition, D* = N-1) (2) Now we can calculate the age if we know the number of daughter atoms produced by decay, D* and the number of parent atoms now present, N.
In addition, it requires that these measurements be taken from several different objects which all formed at the same time from a common pool of materials.
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The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.
Thus, if we start out with 1 gram of the parent isotope, after the passage of 1 half-life there will be 0.5 gram of the parent isotope left.
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Note that the mere existence of these assumptions do not render the simpler dating methods entirely useless.