*3.3. DTPA/DOTA AMA Determination*

Following successful <sup>165</sup>Er isolation from low-purity Ho foils (<100 ppm Er, Alfa Aesar, Haverhill, MA, USA) and high-purity Ho foils (0.5 ppm Er, DOE Ames Laboratory MPC, Ames, IA, USA), EoB-decay-corrected AMA values determined by DTPA and DOTA titration are shown in Table 4.

**Table 4.** Chelator-titration-based AMA results for <sup>165</sup>Er isolated from various qualities of Ho targets.


† AMA decay-corrected to end of bombardment. \* *n* = 3 replicates.
