ISO/TC 147/SC 3
| Projekta Nr. | ISO 20899:2018 |
|---|---|
| Nosaukums | <p>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 and 237Np). The concentrations obtained can be converted into activity concentrations of the different isotopes[9].</p> <p>Due to its relatively short half-life and 238U 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].</p> <p>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.</p> <p>A filtration at 0,45 μm is needed for determination of dissolved nuclides. Acidification and chemical separation of the sample are always needed.</p> <p>The limit of quantification depends on the chemical separation and the performance of the measurement device.</p> <p>This method covers the measurement of those isotopes in water in activity concentrations between around[12][13]:</p> <p>— 1 mBq·l−1 to 5 Bq·l−1 for 239Pu, 240Pu and 237Np;</p> <p>— 1 Bq·l−1 to 5 Bq·l−1 for 241Pu.</p> <p>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.</p> <p>It is possible to measure 241Pu following a pre-concentration step of at least 1 000.</p> |
| Reģistrācijas numurs (WIID) | 69404 |
| Darbības sfēra | <p>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 and 237Np). The concentrations obtained can be converted into activity concentrations of the different isotopes[9].</p> <p>Due to its relatively short half-life and 238U 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].</p> <p>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.</p> <p>A filtration at 0,45 μm is needed for determination of dissolved nuclides. Acidification and chemical separation of the sample are always needed.</p> <p>The limit of quantification depends on the chemical separation and the performance of the measurement device.</p> <p>This method covers the measurement of those isotopes in water in activity concentrations between around[12][13]:</p> <p>— 1 mBq·l−1 to 5 Bq·l−1 for 239Pu, 240Pu and 237Np;</p> <p>— 1 Bq·l−1 to 5 Bq·l−1 for 241Pu.</p> <p>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.</p> <p>It is possible to measure 241Pu following a pre-concentration step of at least 1 000.</p> |
| Statuss | Standarts spēkā |
| ICS grupa | 13.060.60 13.280 17.240 |