The "Uranium Series" refers to a sequence of radioactive decay processes that begin with the isotope Uranium-238. This series involves several intermediate isotopes, including Radium-226 and Radon-222, before ultimately decaying into a stable isotope of Lead-206. Each step in the series emits radiation, which can be measured and used in various applications, including dating geological formations. The Uranium Series is significant in fields like geology and archaeology, as it helps scientists determine the age of rocks and fossils through techniques such as Uranium-series dating. This method is particularly useful for dating materials that are too old for carbon dating, providing insights into Earth's history and the timing of geological events.