本文件规定了通过镭的化学分离和使用液体闪烁计数法测量饮用水样品中镭-226（226Ra）和镭-228（228Ra）活度浓度的测定。 226Ra和228Ra的质量活度浓度可以通过该测试方法利用目前可用的液体闪烁计数器测量，对于0.5 kg的样品质量和在低背景液体闪烁计数器中的1小时计数时间，对于226Ra降至0.01 Bq/kg，对于228Ra降至0.06 Bq/kg[8]。 该测试方法可用于紧急情况下饮用水受镭污染的快速检测。

This document specifies the determination of radium-226 (²²⁶Ra) and radium-228 (²²⁸Ra) activity concentrations in drinking water samples by chemical separation of radium and its measurement using liquid scintillation counting. Massic activity concentrations of ²²⁶Ra and ²²⁸Ra which can be measured by this test method utilizing currently available liquid scintillation counters go down to 0,01 Bq/kg for ²²⁶Ra and 0,06 Bq/kg for ²²⁸Ra for a 0,5 kg sample mass and a 1 h counting time in a low background liquid scintillation counter^[8]. The test method can be used for the fast detection of contamination of drinking water by radium in emergency situations.