Actinium-226 (226Ac) has been previously proposed as a potential surrogate isotope for the development of 225Ac radiopharmaceuticals for targeted alpha therapy (TAT). The benefits of 226Ac include its theoretically superior therapeutic potency as well as a short half-life of its progeny, expected to minimize the toxicities. Researchers from TRIUMF, University of British Columbia and affiliated organizations recently reported the discovery of a novel matched 225/226Ac-radiopharmaceutical pair, [225Ac]crown-TATE and [226Ac]crown-TATE, and conducted studies aiming to compare the radiation dosimetry of these candidates.