[en] High spin ₂₀₉,₂₁₀Po isomers were recoil implanted into tetragonal tin and the electric quadrupole coupling constants have been measured with the TDPAC technique. Using a calculated value for the quadrupole moment of Q[₂₁₀Po(8⁺)] = 57 fm₂ as standard for the electric field gradient calibration, the following other values are derived: Q[₂₀₉Po(17/2^-)] = 39(8)fm₂, Q[₂₁₀Po(11^-)] = 82(19)fm₂ and Q[₂₁₀Po(13^-)] = 62(11)fm₂. These values are in agreement with the known structure of the isomers. The existence of more than one isomer in each isotope has required a data analysis procedure which takes into account feeding through all levels perturbed by the quadrupole interaction. (author)