BS ISO 20899:2018 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.Cross References:ISO 3696ISO 5667-1ISO 5667-10ISO 5667-3ISO 80000-10ISO/IEC 17025ISO 17294-1:2004ISO 17294-2:2016ISO 11352ISO 5667-8ISO 5667-4ISO/IEC Guide 98-3ISO 5667-20ISO 5667-5ISO 5667-6ISO 5667-7ISO 13167:2015All current amendments available at time of purchase are included with the purchase of this document.