Final Draft International Standard
ISO/FDIS 13165-3
Water quality — Radium-226 — Part 3: Test method using coprecipitation and gamma-ray spectrometry
Reference number
ISO/FDIS 13165-3
Edition 2
Final Draft
International Standard
ISO/FDIS 13165-3
This draft is in the approval phase.
Will replace ISO 13165-3:2016


ISO 13165-3:2016 specifies the determination of radium-226 (226Ra) 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 226Ra 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, 223Ra, 224Ra, and 228Ra, to be determined.

General information

  •  : Under development
    : Proof sent to secretariat or FDIS ballot initiated: 8 weeks [50.20]
  •  : 2
     : 15
  • ISO/TC 147/SC 3
    17.240  13.060.60 
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