Prediction of residual radiation levels in particle accelerator facilities is crucial to ensure their safe and continuous operation over long periods of time. At the European Organization for Nuclear Research (CERN), radiological characterization studies of activated components in experimental areas and various machines within the accelerator complex are performed with Monte Carlo radiation transport codes. To ensure the accuracy of the calculations, a comparison with the experimental data is crucial. This work investigates the induced radioactivity in selected materials commonly used in particle accelerator elements and high-energy physics detector components. Conducted at the CERN High-energy AcceleRator Mixed-field (CHARM) facility, the activation experiments focused in particular on copper and two steel alloys and the medium- to long-lived radionuclides (⁵⁴Mn, ⁵⁷Co, ⁵⁸Co, and ⁶⁰Co) produced within them. FLUKA Monte Carlo simulations were performed and the comparison with the experimental data showed a satisfactory agreement.