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Though the Rb and Sr concentrations differ, it’s safe to assume that the isotopic makeup of Sr and of Rb is the same everywhere.This is the key to figuring out how much time has passed since the rock solidified.There are certain kinds of atoms in nature that are unstable and spontaneously change (decay) into other kinds of atoms.For example, uranium will radioactively decay through a series of steps until it becomes the stable element lead. The original element is referred to as the parent element (in these cases uranium and potassium), and the end result is called the daughter element (lead and argon).Note that the mere existence of these assumptions do not render the simpler dating methods entirely useless.In many cases, there are independent cues (such as geologic setting or the chemistry of the specimen) which can suggest that such assumptions are entirely reasonable.The straightforward reading of Scripture reveals that the days of creation () were literal days and that the earth is just thousands of years old and not billions.

Radioisotope dating (also referred to as radiometric dating) is the process of estimating the age of rocks from the decay of their radioactive elements.

in natural minerals, the use of laser ablation inductively coupled plasma mass spectrometry for measuring uranium concentration for apatite and zircon fission-track chronometry, and detrital thermochronology based on measuring Nd isotopic compositions on single apatites by laser ablation ICP-MS, to cite a few examples.

Many accept radiometric dating methods as proof that the earth is millions of years old, in contrast to the biblical timeline.

From the mathematics of radioactive decay, it is easy to see that it is useless beyond a few tens of thousands of years.

Geologists prefer most of the others because most rocks are much older; creationists who talk about carbon dating of rocks reveal a remarkable ignorance of the subject.

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