[en] A method is described for the determination of ²²⁶Ra in environmental samples utilizing a liquid scintillation counting technique. The procedure involves the isolation of ²²⁶Ra from the sample matrix and the extraction of ²²²Rn into a toluene-based scintillant mixture after a suitable ingrowth period. Results of ²²⁶Ra analysis of water samples indicate that the method is applicable to samples having a wide variation in ²²⁶Ra concentrations and chemical composition. The detection limit was estimated to be less than 0.005Bq (0.15 pCi) depending upon the counting system used and counting time