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  • BSI
    BS ISO 20899:2018 Water quality. Plutonium and neptunium. Test method using ICP-MS
    Edition: 2018
    $316.70
    / user per year

Description of BS ISO 20899:2018 2018

This document specifies methods used to determine the concentration of plutonium and neptunium isotopes in water by inductively coupled plasma mass spectrometry (ICP-MS) (239Pu,240Pu,241Pu and237Np). The concentrations obtained can be converted into activity concentrations of the different isotopes[9].

Due to its relatively short half-life and238U isobaric interference,238Pu can hardly be measured by this method. To quantify this isotope, other techniques can be used (ICP-MS with collision-reaction cell, ICP-MS/MS with collision-reaction cell or chemical separation). Alpha spectrometry measurement, as described in ISO 13167[10], is currently used[11].

This method is applicable to all types of water having a saline load less than 1 g·l−1. A dilution of the sample is possible to obtain a solution having a saline load and activity concentrations compatible with the preparation and the measurement assembly.

A filtration at 0,45 μm is needed for determination of dissolved nuclides. Acidification and chemical separation of the sample are always needed.

The limit of quantification depends on the chemical separation and the performance of the measurement device.

This method covers the measurement of those isotopes in water in activity concentrations between around[12][13]:

  • 1 mBq·l−1 to 5 Bq·l−1 for239Pu,240Pu and237Np;

  • 1 Bq·l−1 to 5 Bq·l−1 for241Pu.

In both cases, samples with higher activity concentrations than 5 Bq·l−1 can be measured if a dilution is performed before the chemical separation.

It is possible to measure241Pu following a pre-concentration step of at least 1 000.



Standard NumberBS ISO 20899:2018
TitleWater quality. Plutonium and neptunium. Test method using ICP-MS
StatusDefinitive
Publication Date2018-09-04
Identical National Standard OfISO 20899:2018
DescriptorsTesting, Testing methods, Biological water pollutants, Adsorbed water, Biochemicals
ICS13.280 Radiation protection, 13.060.60 Examination of physical properties of water, 17.240 Radiation measurements
CommitteeEH/3/8
ISBN978 0 580 93246 5
PublisherBSI
Pages22

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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