BS EN ISO 13165-1:2020

1   Scope This part of ISO 13165 specifies the determination of radium-226 ( 226 Ra) activity concentration in non-saline water samples by extraction of its daughter radon-222 ( 222 Rn) and its measurement using liquid scintillation counting. Radium-226 activity concentrations which can be measured by this test method utilizing currently available liquid scintillation counters goes down to 50 mBq l −1 . This method is not applicable to the measurement of other radium isotopes.