Authors:R. Chobola, R. Chobola, P. Mell, P. Mell, L. Daróczi, L. Daróczi, A. Vincze, and A. Vincze
A relatively simple chemical separation procedure has been developed for the simultaneous determination of89Sr and 9 0Sractivities in water samples and on aerosol-filters of the Nuclear Power Plant (NPP) Paks origin. The procedure combines
the cation-exchange chromatographic (Dowex 50 WX 8 resin) and solid phase extraction (EIChroM Sr.SpecÔ, DC18C6 crown ether)
steps. The beta-radiation of radionuclides can be measured directly after the chemical separation by LSC. The activities of89Sr,90Sr and90Y are calculated from an over determined set of equations using a method of constrained optimization technique. The equations
are based on LSC measurements performed in three counting windows plus the90Sr-90Y decay law. The chemical yield of strontium is determined by ICP-AES. The lowest limits of detectable activity, for the measurement
time of 600 minutes, are 30 mBq/sample and 18 mBq/sample for89Sr and90Sr, respectively.