Irradiation of the aqueous solution (0.6 M potassium iodide and 0.1 M potassium iodate in 0.01 M borate buffer (pH 9.25)) results in the linear formation of triiodide, which can be determined photometrically. Based on the concentration of triiodide and the quantum yield of the reaction (a basic value of 0.73 and its temperature and concentration dependence was applied) the UV-C dose was calculated. Further details about the method can be seen at