42CaO purchased from Isoflex USA had a 42Ca enrichment of 96.30% and was utilized for target synthesis in the first 10 productions indicated in Table 2 . 42CaO containing an enrichment of 94.37% was purchased from Oak Ridge National Laboratory and was utilized in the remaining 43Sc productions. Targets were prepared by transferring the material into a pellet press (Parr Instrument Company, Moline, IL, USA, P/N 2810-2106-103101) and manually pressing each target.
After the target was synthesized, two pieces of graphite foil (25 ยต, Digi-Key, P/N EyG-S091203DP) were prepared by pre-coring two small holes through which the M3 screws passed when joining the target to the holder. The wooden handle (3.175 mm) of a simple swab was used to make the holes. The target was then placed between these two graphite foils on the backing plate of the target holder and then held in place by the retaining ring, which was secured by two M3 screws. Before the beam stop was inserted into the cyclotron port for irradiation, the carbon foil was trimmed, and diffusion pump oil was applied to the target holder backing to improve thermal transfer.
After the target was synthesized, two pieces of graphite foil (25 ยต, Digi-Key, P/N EyG-S091203DP) were prepared by pre-coring two small holes through which the M3 screws passed when joining the target to the holder. The wooden handle (3.175 mm) of a simple swab was used to make the holes. The target was then placed between these two graphite foils on the backing plate of the target holder and then held in place by the retaining ring, which was secured by two M3 screws. Before the beam stop was inserted into the cyclotron port for irradiation, the carbon foil was trimmed, and diffusion pump oil was applied to the target holder backing to improve thermal transfer.