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Polarized lepton beams are an important design aspect of the future 100 km-scale Circular Electron-Positron Collider (CEPC). Precision beam energy calibration using resonant depolarization, as well as longitudinally polarized colliding beams are being actively investigated. The achievable beam polarization level for different beam energies and application scenarios depend on the radiative depolarization in the collider rings. In this paper the radiative depolarization effects are evaluated forarXiv:2204.12718v1 fatcat:yhanxicacjahpkozumrntu22ja