The ISO 22017 standard provides guidance for rapid radiological measurements in the event of a nuclear or radiological emergency. The standard provides guidance on how to quickly and effectively measure radioactive contamination in water in the event of a sudden nuclear accident or radiation leak. It covers applicable testing equipment, Measuring methods, operating procedures, and emergency Response steps to ensure that accurate radiological data can be obtained in an emergency to help relevant agencies assess the safety of water sources. The standard is essential for nuclear safety, public health protection, and environment monitoring. It is an important reference tool for emergency response personnel and agencies to conduct rapid and accurate water quality testing.