Radioactive strontium is one of the most detrimental components of radioactive fallout. Isotopes are deposited in bones with a high risk of development of chronic illness. In this talk, a method for the express determination of the content of radioactive strontium in organic samples with using a highly selective sorbent will be presented. The method presented provides a considerable reduction of time needed for measurement of a sample (8-10 hours) in comparison to traditional radiochemical methods (up to 2 weeks). The principle of the method is based on chromatographic extraction of strontium from nitrate solutions followed by a radiometric determination of the radioactive strontium activity. The sample preparation was carried out by wet ashing. A new resistant styrene-divinyl benzene copolymer was tested and used as column substrate. Radioactive strontium activity was determined by liquid scintillation counting. Test results and field data of real samples will be presented.