[en] The Sorben-Tec system was developed for rapid evaluation of "1"3"7Cs in drinking water using a domestic personal dosimeter or beta-radiometer. Linear calibration curves were obtained for dosimetric and beta-radiometric measurement of caesium. In case of 20 L drinking water sample, detection limits of "1"3"7Cs were found to be 12.3 and 2.0 Bq L"-"1 for dosimetric and beta-radiometric measurement respectively. This system is recommended for using by non-professionals who are living at radioactively contaminated areas or near nuclear power plants. (author)