Optical properties of pure and RE doped KMgF3 crystals were studied. T
hermoluminescence curves are independent of the introduced impurity fo
r all dopant besides europium. Emission, radiation damage and TL are f
ound to be significantly dependent on the types of Eu-dopant added to
the melt: europium fluoride or oxide. An intensive high temperature TL
peak at 390 degrees C in KMgF3(Eu2O3) may be used as a dosimetric one
not only for ionizing but also for UV radiation.