[en] In comparison to single intakes it is of particular interest to study the distribution of radionuclides in the body of domestic animals after continuous ingestion of radionuclides. We performed a study to determine the activity concentrations of Cs-137 and of the naturally occurring K-40 throughout the whole gastro-intestinal tract of a cow. The cow was born one year after the fallout following the Chernobyl accident. Therefore the activity level in the cow resulted from the activity originating from the mother-cow and the activity due to chronically ingestion of highly contaminated forage during four years. The cow was slaughtered in November 1992 and dissected in anatomical parts. Samples of the whole digestive apparatus were taken to determine the activities. Further analysis of measured data will be used to develop and to describe models for continuous ingestion