[en] Site-specific transfer coefficient from feed to cow's milk, for ¹³⁷Cs in the villages around Narora, a nuclear power station site in India, determined over a period of 17 y, is presented in this paper. In the transport model for the prediction of the concentration of ¹³⁷Cs in milk, the transfer coefficient from feed to milk, F_m, is an important parameter. The transfer coefficient value is determined from ¹³⁷Cs concentration in milk and grass samples of the Narora region, and the result ranged from 4.28E-03 to 3.30E-02 d l^-1 with a geometric mean value of 1.15E-03 d l^-1. The highest and the lowest values were only below one order of magnitude different from the mean, regardless of the type of diet, milk yield and age of the cow. The result is compared with that for ⁴⁰K, determined concurrently at the same region and ranged from 6.92E-03 to 8.01E-03 d l^-1 with a geometric mean value of 7.45E-03 d l^-1. This parameter is quite useful in decision-making for implementing countermeasures during a large-area contamination with ¹³⁷Cs in tropical areas like Narora. The ingestion dose from fallout ¹³⁷Cs through milk intake for adult and child is also estimated. (authors)