The concentrations of 210Pb, 210Po, 137Cs and stable lead (Pb) were determined in soil, and various vegetation samples from the heath, and in the liver and kidneys (137Cs, Pb and K also in meat) of Lüneburg heath sheep. The concentrations of 210Pb, 210Po, 137Cs and Pb in the soil are within the range of what is presently observed in other largely unpolluted areas of West Germany. While this is also true for the samples of vegetation with regard to 210Pb, 210Po and Pb, parts of heather and bilberry plants accumulate 137Cs. The behaviour of Pb, Po, 137Cs, Pb and K in the meat, liver and kidneys of the sheep is complex: depending on the tissue and the radionuclide or element considered, significant differences between male and female animals and/or a dependence of the concentration on the age exist. Compared to other animals, the concentration of 137Cs in tissues of the heath sheep is unusually high. Most likely this is because for most of the year they feed on heather. A significant correlation between 137Cs and K in the tissues was not observed. The concentrations of Pb found in the livers and kidneys of the animals are comparatively high. A considerable fraction of these samples exhibits Pb concentrations which are above the "Guidance Values '79" of the Federal Health Office for the concentration of this element in livers. Concentration factors for the transfer of 210Pb, 210Po, 137Cs and Pb from the feed to the animal tissues are estimated.