This International Standard specifies a method for determining the activity concentration of 210Po by alpha spectrometry in all types of naturally occurring water. The detection limit of this method depends on the volume of the sample, the measurement time, the counting rate of the zero effect and the yield. In the case of drinking water, the analysis is usually carried out on the raw sample and without filtering or other pretreatment. To remove contained material, filtering with a pore size of 0.45 µm is recommended. Analysis of insoluble components requires a mineralization step that is not covered in this International Standard (see NF M 60-790-4). In this case the determination is carried out with the different phases obtained. The final activity is then the sum of all measured activity concentrations.
EN ISO 13161:2015 Referenced Document
ISO 11929:2010 Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionizing radiation - Fundamentals and application
ISO 3696:1987 Water for analytical laboratory use; Specification and test methods
ISO 5667-1:2006 Water quality - Sampling - Part 1: Guidance on the design of sampling programmes and sampling techniques
ISO 5667-3:2003 Water quality - Sampling - Part 3: Guidance on the preservation and handling of water samples