本文件规定了一种通过液体闪烁计数测定海水、地表水、地下水、雨水、饮用水或废水中氚化水（【3H】H2O）样品中氚活度浓度的方法。 该方法不直接适用于有机结合氚的分析；其测定需要对样品进行额外的化学处理（如化学氧化或燃烧）。 在合适的技术条件下，检出限可低至1 Bq·l？1.氚活度浓度低于106 Bq·l？1可以在没有任何样品稀释的情况下测定。

This document specifies a method by liquid scintillation counting for the determination of tritium activity concentration in samples of marine waters, surface waters, ground waters, rain waters, drinking waters or of tritiated water ([³H]H₂O) in effluents. The method is not directly applicable to the analysis of organically bound tritium; its determination requires additional chemical processing of the sample (such as chemical oxidation or combustion). With suitable technical conditions, the detection limit may be as low as 1 Bq·l^？1. Tritium activity concentrations below 10⁶ Bq·l^？1 can be determined without any sample dilution.