Yttrium-aluminum garnets, strontium and barium lanthanum gallates, lithium
niobate and tantalate as-grown crystals and doped by diffusion with rare-ea
rth (Nd, Dy, Er, Tm, Ho, Pr, Ce) and metal transition elements (Mn, Cr) wer
e investigated optically and using Electron Spin Resonance method before an
d after gamma, electron and proton irradiation.