The production of 123I from 123Te by the 123Te(p, n)123I reaction at various target enrichments (99.9, 91, 85.4, and 70.1%) was simulated using ALICE and SRIM programs.The 123I production feasibility by the above reaction was evaluated.The calculations give more accurate results for p beam energy of <30 MeV.The cross sections of all Te reactions with p were calculated at 0-30 MeV p beam energy with ALICE program, and the yield of 123I was calculated by anal. methods.The prediction for 123I production via bombardment of 123Te (99.9%) with a p beam energy of 5-15 MeV is ∼7.2 mCi μA-1 h-1.