Strontium isotope dating

The application to Rb/Sr dating is evaluated and shown to result in expected age overestimates when isotopic ratios are employed to linearize the isochron.A suggested method to test for this effect is argued to require rigorous statistical analysis.“Some mathematical and geophysical considerations in radioisotope dating applications” : 10.13182/NT16-98 Abstract: Some quality considerations for use in isotopic dating are presented to identify and correct heretofore unidentified overestimate scenarios.

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any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.

So, researchers “normalize” the data by making a ratio with strontium-86, which is stable – meaning it doesn’t decay over time.

Dividing the isotope concentrations of all the forms of strontium and rubidium by the isotope concentration of strontium-86 generates something called the “isochron.” The isochron is then plugged into a model, which uses it to turn the overall radioisotope data into a clear, linear function.

Although without the ratios, the data are inherently noisy.

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