Radiometric Dating and Half Life

Other dating methods have different strengths. This technique developed in the late s but came into vogue in the early s, through step-wise release of the isotopes. Determine the approximate time at which the rock formed. Some techniques place the sample in a nuclear reactor first to excite the isotopes present, then measure these isotopes using a mass spectrometer such as in the argon-argon scheme. Short-lived isotopes Isotopes made during nucleosynthesis that have nearly completely decayed away can give information on the time elapsed between nucleosynthesis and Earth Formation. This can be seen in the concordia diagram, where the samples plot along an errorchron straight line which intersects the concordia curve at the age of the sample. When the rock formed, it contained all of the U currently in it, plus some U that has since undergone radioactive decay.

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