PACS 61.82. Ms, 76.30.Mi, 76.60.Es Ionizing radiation like g-rays, electrons, or swift heavy ions create a variety of point defects in dielectric materials. The largest fraction of the defects consists of the paramagnetic F centers. Here, we study those F centers in LiF by nuclear magnetic resonance. Nuclear spin relaxation (T 1 ) measurements serve as a probe for the F centers offering the possibility to investigate their dynamics as a function of temperature and irradiation dose. Moreover, one is able to estimate the content of the paramagnetic defects from the T 1 -data over a wide range of concentration. We further observed and analyzed radiation annealing occurring at temperatures above 360 K.

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