Barium carbonate

Bulk BP crystal as raw material, which was purchased from Nanjing MKNANO Tech. Co. Ltd (http://www.mukenano.com). PDMS precursor was purchased from Dow Corning. Lead bromide (PbBr₂, 99.999%), barium carbonate (Cs₂CO₃, 99.999%), hexane (anhydrous, 98%), 1-octadecene (ODE, technical grade, 90%), toluene (anhydrous, 98%), oleic acid (OA, technical grade, 90%), oleylamine (OLA, technical grade, 70%), methyl acetate (MeOAc, anhydrous, 99.5%), and N-methyl pyrrolidone (NMP, AR) were purchased from Sigma-Aldrich.

Table 1 displays the isotopic compositions of ¹³⁵BaCO₃, ^natBaCO₃, and ^natBa metal. Isotopically enriched ¹³⁵BaCO₃ was obtained from Trace Sciences International. Barium carbonate (99.999% trace metals basis), barium metal (99.99% trace metals basis), American Chemical Society reagent–grade concentrated hydrochloric acid (37%), nitric acid (70%), ammonium hydroxide (28%), and periodic table mix inductively coupled plasma optical emission spectrometry (ICP-OES) elemental standards were obtained from Sigma-Aldrich. Oxalic acid dihydrate (99.5%) was purchased from Fisher Scientific. Aluminum disks were obtained from Michaels, and aluminum foil was purchased from Goodfellow Cambridge. Indium wire was purchased from AIM Specialty Materials. Branched diglycolamide resin was purchased from Eichrom. Eckert and Ziegler Isotopes National Institute of Standards and Technology–traceable γ-ray sources were used for high-purity germanium (HPGe) detector energy and efficiency calibration. Thin-layer chromatography silica gel sheets were purchased from Merck. Water (18 MΩ·cm) was obtained from a MilliporeSigma Direct-Q 3 ultraviolet system. ⁸⁹Zr was provided by the Washington University Cyclotron Facility. DOTA was purchased from Macrocyclics. Macropa was purchased from MedChemExpress. PSMA-I&T was obtained from ABX Advanced Biochemical Compounds. DCFPyL was synthesized in-house.