Presently, the 'primary' source of Ac-225 comes from "thorium-229" (Th-229) decay. Stores of Th-229 were considered a waste product, leftover from nuclear programs in the 1940s and 1950s. For many years, Th-229 was stored in a secure facility—until the discovery that Ac-225 and its decay daughter, Bi-213 were of great medical interest. Scientists at Oak Ridge National Laboratory (ORNL) began "milking" the stores of Th-229—a process that involves separating Ac-225 from the other isotopes that decay from thorium. The process is repeated every month, with each batch yielding millicurie quantities of Ac-225.
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