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In implementing this approach, scientists assumed that the initial ratio of daughter nuclei will remain the same throughout the rock matrix where there are no parent nuclei— i.e., from the time of solidification until the present time, all daughter nuclei are produced only by decay of the parent nuclei in the sample being analyzed.This initial ratio can be quantified by graphing the ratio of the daughter nuclei versus the ratio of the parent nuclei to the non-radiogenic daughter nuclei for chemically different parts of a rock sample on an XY plot and extending the resulting straight line to the Y intercept where there are zero parent nuclei.But how accurate is their model, and how scientific is their approach? An isochron is a line on an isotope ratio diagram denoting rock samples.

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Thus, geochronologists need a more reliable method of dating materials than the straightforward accumulation radioactive decay clock.

The better dating method is called the of radioactive dating.

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