89Zr was produced through the 89Y(p,n)89Zr reaction on an EBCO TR19/9 variable-beam energy cyclotron (Ebco Industries Inc., British Columbia, Canada) at Memorial Sloan Kettering Cancer Center. The crude product was purified in accordance with previously reported methods to yield 89Zr with a specific activity of 5.3−13.4 mCi/µg.36 (link) Dose measurements were made using a Capintec CRC-15R Dose Calibrator (Capintec, Ramsey, NJ).