Terbium-161 (Tb-161) is a radiolanthanide that shows promise for use in theranostic nuclear medicine. To obtain Tb-161 in a form amenable for medical use, the isotope must be separated from gadolinium, generally using DGA (N,N,N’,N’-tetra-n-octyldiglycolamide) and LN (Bis(2-ethylhexyl) phosphate) resins.
