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ISO 9698:1989 Water quality - Determination of tritium activity concentration - Liquid scintillation counting method
standard by International Organization for Standardization, 12/01/1989
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The method specified is applicable to all types of water including seawater with concentrations of up to 10 ^ 6 Bq/m ^ 3 when using 20 ml counting vials. The method is not applicable to the analysis of organically bound tritium; its determination requires an oxidative digestion.