“…The lanthanides 153 Gd (T 1/2 = 240.4 days) finds application in single photon emission computed tomography (SPECT) used for diagnosing neurological disorders, cardiac blockages or abnormalities, and primary and metastasized cancer. 153 Gd is also used in industrial radiography, for ascertaining the strength and integrity of structural materials and piping systems [29][30][31]. Recently terbium radionuclides, especially 149 Tb (T 1/2 = 4.11 h) is under focus as an excellent radionuclide for targeted therapy.…”