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Another isotope of strontium, almost always Sr-86, is used as a reference isotope. Measured Sr-87 to Sr-86 ratios plotted against Rb-87 to Sr-86 ratios yield a straight line, called an isochron, for a suite of samples. The initial Sr-87 to Sr-86 ratio is estimated from the y axis intercept, and the apparent age is estimated from the slope of the isochron line.


Ó 2010 Arthur V. Chadwick, Ph.D.