Uranium series dating techniques rely on the fact that radioactive uranium and thorium isotopes decay into a series of unstable, radioactive “daughter” isotopes; this process continues until a stable non-radioactive lead isotope is formed. The daughters have relatively short half-lives ranging from a few hundred thousand years down to only a few years. The “parent” isotopes have half-lives of several thousand million years. This provides a dating range for the different uranium series of a few thousand years to , years. Uranium series have been used to date uranium-rich rocks, deep-sea sediments, shells, bones, and teeth, and to calculate the ages of ancient lake beds. The two types of uranium series dating techniques are daughter deficiency methods and daughter excess methods. In daughter deficiency situations, the parent radioisotope is initially deposited by itself, without its daughter the isotope into which it decays present. Through time, the parent decays to the daughter until the two are in equilibrium equal amounts of each. The age of the deposit may be determined by measuring how much of the daughter has formed, providing that neither isotope has entered or exited the deposit after its initial formation. Living mollusks and corals will only take up dissolved compounds such as isotopes of uranium, so they will contain no protactinium, which is insoluble.
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