Summary In the 1977 UNSCEAR report a model has been used to describe the transfer of fallout from nuclear explosions to the activity in milk. Swedish data on milk was fitted to this model by regression analysis. Our data consist of regular countrywide measurements since 1962 for 137Cs and 1966 for 90Sr in milk. Fallout measurements of 137Cs have been made since 1962. To get a better fit, the fallout data has been supplemented with fallout data of 90Sr derived from data of fallout on the northern hemisphere for the years 1957-61. The transfer factors which describe the transfer from fallout to activity in milk were found to be for the countrywide mean values of 137Cs 8.1 Bqyear/gK/kBq/m2 and of 90Sr 5.1 Bqyear/gCa/kBq/m2. The transfer factors for 137Cs for Stockholm, Malmö and Gothenburg were 5.9, 4.4 and 8.7 Bqyear/gK/kBq/m2. These values agree closely to the values found in a survey made by the Institute in 1972. They also seem to agree with the values from Denmark and Norway in the 1977 UNSCEAR report.