BS EN ISO 22515:2021

This standard BS EN ISO 22515:2021 Water quality. Iron-55. Test method using liquid scintillation counting is classified in these ICS categories:

• 13.060.60 Examination of physical properties of water
• 17.240 Radiation measurements

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.

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.