isotopes with shorter half-lives are more useful for dating the age of earth.

York D, Dalrymple, GB. Since Ar is a noble gas, it can escape from a magma or liquid easily, and it is thus assumed that no 40 Ar is present initially. The half-lives of several isotopes are listed in Table Main article: Uranium—thorium dating. York D. United States Geological Survey. In Roth, Etienne; Poty, Bernard eds.

ISOTOPES WITH SHORTER HALF-LIVES ARE MORE USEFUL FOR DATING THE AGE OF EARTH. / morphy.info

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