[en] There were investigated the optical absorption centers formation in magnesium aluminate spinel ceramics under irradiation with UV-light, X-, and gamma-rays. The lithium fluoride doped ceramics were produced by using hot-pressing technology. It was revealed that generation by irradiation changes in optical absorption spectra can be used for detection of invisible point defects in prepared ceramics, their distribution through the bulk of spinel disk, and predict the behavior of ceramics in different radiation fields.