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Magnetic susceptibility as a function of temperature (4–250K) and EPR spectra at room temperature were studied for thermoluminescence detectors (TLD) CaF2:Mn with either stored dose information or cleaned dose by annealing. No essential variations of Mn2+ number in detectors were found due to dose storage; however, the exchange interactions between manganese ions are observed as deviations from Curie–Weiss...