2012NF M60-806:2012 Water quality - Strontium 90 and strontium 89 - Test methods using liquid scintillation counting or proportional counting.
2005NF M60-806-3:2005 Nuclear energy - Measurement of radioactivity in the environment - Water - Part 3 : measurement of strontium 90 activity in water - Radiochemical separation of strontium by extraction with "ethers crown" resin and measurement of beta activity.