Application of the absolute method for determination of tritium and radiocarbon in groundwater from radioactive waste facility

The primary method was used for standardization and preparation of working solutions of H-3 and C-14 which were applied for calibration of the secondary instrument.Tritium and radiocarbon were assessed with the double-label counting of groundwater samples prepared for direct measurement. The combined uncertainty did not exceed 10% at low Rn-222 activity concentrations.