BS EN ISO 13165-3:2020

1   Scope This part of ISO 13165 specifies the determination of radium-226 ( 226 Ra) activity concentration in all types of water by coprecipitation followed by gamma-spectrometry (see ISO 18589‑3). The method described is suitable for determination of soluble 226 Ra activity concentrations greater than 0,02 Bq l −1 using a sample volume of 1 l to 100 l of any water type. For water samples smaller than a volume of 1 l, direct gamma-spectrometry can be performed following ISO 10703 with a higher detection limit.

NOTE This test method also allows other isotopes of radium, 223 Ra, 224 Ra, and 228 Ra, to be determined.