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Calibration
For example, with [[Uranium-lead dating]] with the crystallization of magma, this remains a closed system until the uranium decays. As it decays, it disrupts the crystal and allows the lead atom to move. Likewise, heating the rock such as [[granite]] forms [[gneiss]] or [[basalt]] forms [[schist]]. This can also disrupt the ratios of lead and uranium in the sample.
For example, with [[Uranium-lead dating]] with the crystallization of magma, this remains a closed system until the uranium decays. As it decays, it disrupts the crystal and allows the lead atom to move. Likewise, heating the rock such as [[granite]] forms [[gneiss]] or [[basalt]] forms [[schist]]. This can also disrupt the ratios of lead and uranium in the sample.
== Calibration ==
In order to calibrate radiometric dating methods, the methods need to be checked for accuracy against items with independently-known dates.
This is a problem because most of the dates of artifacts are only known from radiometric dating methods.
Carbon dating, with it's much lower maximum theoretical range, is often used for dating items only hundreds and thousands of years old, so can be calibrated in its lower ranges by comparing results with artifacts who's ages are known from historical records.
Scientists have also attempted to extend the calibration range by comparing results to timber which has its age calculated by [[dendrochronology]], but this has also been questioned because carbon dating is used to assist with working out dendrochronological ages.
Otherwise, calibration consists of comparing results with ages determined by other radiometric dating methods.
However, tests of radiometric dating methods have often shown that they do ''not'' agree with known ages of rocks that have been seen to form from volcanic eruptions in recent and historic times, and there are also examples of radiometric dating methods not agreeing with each other.
Young-Earth creationists therefore claim that radiometric dating methods are not reliable and can therefore not be used to disprove Biblical chronology.
==Some major methods of radiometric dating==
==Some major methods of radiometric dating==