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Measurements of dipole relaxation of two types of R '+-interstitial complexes in SrF,:R + single crystals using the ionic-thermocunents method are reported. For the light elements in the series of Ianthanides we have found relaxations due to tetragonal complexes, whereas in crystals doped with heavy R'+ ions such as Dy'+, Ho'+, etc. , the predominant defects have trigonal symmetry. The variation of the activation energy as a function of the R '+ radius is discussed. In addition, the effect of the impurity concentration on the relaxation parameters is studied.