NF EN ISO 13165-3, M60-811-3 (12/2024)

ISO 13165-3:2016 specifies the determination of the activity concentration of radium 226 (226Ra), in all types of water by coprecipitation followed by gamma spectrometry (see ISO 18589-3). The method described is applicable for the determination of the volume activity of soluble 226Ra having a 226Ra volume activity greater than 0.02 Bq l-1 using a sample volume between 1 l and 100 l of any type of water. For water samples smaller than 1 l volume, direct gamma spectrometry can be performed conforming to ISO 10703 with a higher detection limit. NOTE This test method also allows the measurement of other radium isotopes (223Ra, 224Ra and 228Ra).
(Automatic translation from French)