EN ISO 22515:2021

Water quality - Iron-55 - Test method using liquid scintillation counting (ISO 22515:2021)

Publication date:   Jul 15, 2021

General information

60.60 Standard published   Jun 9, 2021


CEN/TC 230 Water analysis

European Norm

17.240   Radiation measurements



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This document specifies a test method for the determination of iron-55 (55Fe) activity concentration in samples of all types of water using liquid scintillation counting (LSC). Using currently available liquid scintillation counters, this test method can measure the 55Fe activity concentrations in the range from the limit of detection up to 120 mBq l-1. These values can be achieved with a counting time between 7 200 s and 10 800 s for a sample volume from 0,5 l to 1,5 l. Higher activity concentrations can be measured by either diluting the sample or using smaller sample aliquots or both.
NOTE      These performance indicators are wholly dependent on the measurement regimes in individual laboratories; in particular, the detection limits are influenced by amount of stable iron present.
The range of application depends on the amount of dissolved material in the water and on the performance characteristics of the measurement equipment (background count rate and counting efficiency).
It is the laboratory’s responsibility to ensure the suitability of this test method for the water samples tested.

Life cycle


EN ISO 22515:2021
60.60 Standard published
Jun 9, 2021