The ISO 13169 standard specifies a test method for the determination of uranium concentration in water using the alpha liquid scintillation counting method. This method uses a liquid scintillation counter to detect alpha particles produced by the radioactive decay of uranium isotopes in a sample, so as to achieve quantitative analysis of uranium. This standard is suitable for water quality monitoring, environment protection and uranium contamination detection in the field of nuclear energy. This method can effectively assess uranium contamination levels in water bodies, provide accurate data support, and help to develop environmental management measures to ensure water quality safety.