

Each such age would match the result given by the isochron.Gain or loss of In order to make the figures easy to read (and quick to draw), the examples in this paper include few data points.(Rocks which include several different minerals are excellent for this.) Each group of measurements is plotted as a data point on a graph.The Xaxis of the graph is the ratio of in a closed system over time.Now that the mechanics of plotting an isochron have been described, we will discuss the potential problems of the "simple" dating method with respect to isochron methods.


(This topic will be discussed in much more detail below.) Where the simple methods will produce an incorrect age, isochron methods will generally indicate the unsuitability of the object for dating.Unfortunately, one must wade through some hefty math in order to understand the procedures used to fit isochron lines to data.General comments on "dating assumptions" All radiometric dating methods require, in order to produce accurate ages, certain initial conditions and lack of contamination over time.The simplest form of isotopic age computation involves substituting three measurements into an equation of four variables, and solving for the fourth.The equation is the one which describes radioactive decay: If one of these assumptions has been violated, the simple computation above yields an incorrect age.Age "uncertainty" When a "simple" dating method is performed, the result is a single number.
