[Theoretical derivation of a logarithmic equivalence function for the fractionation in depth therapy (author's transl)]

The effect of fractionated radiation therapy is essentially dependent on recovery of the tissues during the fractionation intervals. Supposing the recuperative capacity of irradiated tissues is lessening in the course of a depth therapy series (introduction of the term "change of the seeming recovery"), an equivalence function for fractionation is obtained and the conventional logarithmic function therefrom derived. Qualities of the here developed equivalence function are discussed.