Undersökning av vattens fysikaliska egenskaper

This document specifies a test method for the determination of gross beta activity concentration in non saline waters. The method covers non-volatile radionuclides with maximum beta energies of approximately  0,3 MeV or higher. Measurement of low-energy beta emitters (e.g. 3H, 228Ra, 210Pb, 14C, 35S and 241Pu) and  some gaseous or volatile radionuclides (e.g. radon and radioiodine) are not be included in the gross beta  quantification using the test method described in this document.

This test method is applicable to the analysis of raw and drinking waters with low amounts of total soluble  salts in the water. Limit of detection depends on the performance characteristics (background count rate  and counting efficiency) of the counter used.

It is the laboratory’s responsibility to ensure the suitability of this method for the water samples tested. 

As this method requires sample preparation in laboratory facilities, it is not suited for rapid, in-the-field  analysis.

This document specifies the measurement method for the determination of total activity concentration of uranium isotopes in non-saline waters by extraction and liquid scintillation counting. This method covers the measurement of soluble uranium isotopes in water in activity concentrations between approximately 2·10−3 Bq/kg and 10 Bq/kg when analysing a 1 l test sample volume with a 60 000 s counting time with a typical alpha LSC instrument. The ratio 234U/238U can also be determined. This method has not been tested for the measurement of other uranium isotopes.