Transfer factors for 137Cs and 90Sr from grass to bovine milk under field conditions

Transfer factors for 137Cs and 90Sr from herbage to cow's milk have been calculated from data acquired from a routine monitoring programme in west Cumbria during 1977 to 1985. The values for 137Cs and 90Sr, 0.004 d l-1 and 0.001 d l-1, respectively, agree reasonably well with values reported in the literature from controlled experiments.