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 thorium-234 and radium-226, before ultimately decaying into a stable isotope, 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 nuclear science. It helps scientists understand the age of rocks and minerals through a method called radiometric dating. Additionally, the series is important for assessing the safety and management of radioactive waste from nuclear reactors.