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The European Directive 2013/51/EURATOM lays down the requirements for the protection of public health in general, with regard to radioactive substances in water intended for human consumption. The parametric values recommended in the Directive are 100 Bq L-1 for Radon (Rn-222), 100 Bq L-1 for Tritium (H-3) and 0.10 mSv for Indicative Dose (ID). According to the Decree-Law No. 23/2016 of 3 June, the parametric value for Rn-222 in Portugal was set at 500 Bq L-1. The values of the recommended levels of verification for gross alpha and gross beta activity concentrations are 0.1 Bq L-1 and 1 Bq L-1, respectively. If these activities are lower than the verification levels it is assumed that the value of DI is lower than the parametric value (0.1 mSv), with no need of complementary radioactivity analysis. If the concentrations of gross alpha and gross beta activities exceed the stipulated limits, it is necessary to analyze the specific radionuclides. Liquid Scintillation Counting (LSC) technique was used for the determination of such radioactive parameters, namely for the determination of gross alpha, gross beta and Rn-222 activity concentrations (Figure below).

 PSR 15a  PSR 15b  PSR 15c

Determination of gross alpha, gross beta and Rn-222 in waters for human consumption.

Contact person: M. José Madruga