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A semi-automated, in-house external beamline, ≤40 μA at 11.7 MeV for 120 min (degraded from 18 MeV to suppress 88Y & 88Zr co-production) produced 89Zr from 89Y(p,n)89Zr. EOB activity (by HPGe γ-spectr.) of 89Zr in target discs, derived from multiple runs, was 1.42 GBq (±0.45 GBq [SD], n=4) which was 67% (±21%, n=4) of the theoretical activity, with a maximum of 1.84 GBq (87% of theory) achieved. Recovery was 88% (±9%, n=4), radionuclidic purity >99% (n=4) and chemical purity 0.2 ppm Zr (±0.3 ppm, n=3, ICP-MS). The Zr:Y ratio improved from 1:10000 in the pre-filtered solution to 1:10 in the product purified by hydroxamate column. Efficiency of radiolabeling to monoclonal antibody (mAb; trastuzumab) was 100% and purified 89Zr did not bind non-specifically to mAb. Chelator:mAb ratio was 1.3:1. No-carrier-added specific activity of purified 89Zr was 408 MBq/μg (±26 MBq/μg, n=2) via the titration-by-chelator method. Minimum ligand concentration for which 100% labeling occurred was 302 nmol/L. Small animal PET ...

Establishing reliable production of the PET isotope [sup 89]Zr for research use: From target fabrication to preclinical imaging