A comparison of the resorption rates measured for the radionuclides Ce, Co, Pu, Ru, Sr and Zn as well as the vitamin B12 with the recommendations for calculation given by the SSK showed that the values used by the SSK partly are too low by orders of magnitude. The dose factors therefore no longer correspond to the international level of science. (DG). Steinhilber-Schwab,-B.; Teufel,-D. (Institut fuer Energie- und Umweltforschung e.V., Heidelberg (Germany, F.R.))