DIN EN ISO 22908:2022-11: Water quality - Radium 226 and Radium 228 - Test method using liquid scintillation counting (ISO 22908:2020); German version EN ISO 22908:2020

This document specifies a method for the determination of activity concentrations of radium-226 and radium-228 in drinking water samples by chemical separation of radium and its measurement with the liquid scintillation counter. With this test method, mass-related activity concentrations of ${}^{226}$Ra and ${}^{228}$Ra can be determined with currently available liquid scintillation counters up to a lower limit of 0.01 Bq/kg (${}^{226}$Ra) and 0.06 Bq/kg (${}^{228}$Ra), respectively, if 0.5 kg sample mass and a measurement duration of 1 hour are used in a liquid scintillation counter with low zero effect. The test method can be used for rapid detection of contamination of drinking water with radium in emergency situations. This document has been prepared by the Technical Committee ISO/TC 147 "Water quality" in cooperation with the Technical Committee CEN/TC 230 "Water analysis". The responsible German standardisation body is the subcommittee NA 119-01-03-08 UA "Radioactivity measurement in water" of the working committee NA 119-01-03 AA "Water analysis" in the DIN Standards Committee Water Engineering (NAW).