Rare-event search experiments need extremely low backgrounds. The cosmogenic background of detector materials af-fects the sensitivity of the experiments, so its estimation before the detector installation is necessary. Many upcoming experiments, including the DarkSide-20k (DS-20k) WIMP-search experiment, use liquid argon (LAr) as a target. The dominant radioactive iso-topes produced in LAr include 3H, 37Ar, 39Ar, and 42Ar. DS-20k will use Underground Argon (UAr) as the target, which will be transported from its extraction site in Colorado to the detector site in Italy. We developed an Activation Calculation Software tool to estimate the induced activity of radioactive isotopes produced during UAr transportation. The software helps us to efficiently plan the 39Ar depletion required for LAr experiments. A comparison with measurements from the DarkSide-50 experiment is left for future work.

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