Moreover, after initial extraction of the daughter elements it contains, the thorium-232 is retained. Given this radioisotope's extremely long half-life (14 billion years), it will produce descendants again, allowing 212Pb to be extracted again a few years later. Every drum can thus be re-used indefinitely to produce 212Pb.
The patented, entirely chemical process, developed by Orano Med consists of several successive steps of extraction and purification of descendants of thorium-232: radium-228, thorium-228, radium-224 and finally lead-212. Not having recourse to either nuclear reactors or particle accelerators, the chain for the production of 212Pb and the drugs is fully integrated within Orano Med and is independent of external radionuclide suppliers.