Povinec, P.Badie, C.Baeza, A.Barci-Funel, G.Bergan, T. D.Bojanowski, R.Burnett, W.Eikenberg, J.Fifield, L. KeithSerradell, V.Gastaud, J.Goroncy, I.Herrmann, J.Hotchkis, Michael A.Ikaheimonen, T. K.Jakobson, E.Kalimbadjan, J.La Rosa, J.Lee, S. H.Liong Wee Kwong, L.Lueng, W. M.Nielsen, Sune G.Noureddine, A.Pham, M. K.Rohou, J.-N.Sanchez-Cabeza, J.Suomela, J.Suplinska, M.Wyse, E.2015-12-130236-5731http://hdl.handle.net/1885/93179A certified reference material (CRM) for radionuclides in seawater, IAEA-381 (Irish Sea Water), is described and the results of certification are presented. The material has been certified for nine radionuclides (40K, 90Sr, 137Cs, 237Np, 238Pu, 239Pu, 240Pu, 239.240Pu and 241Am). Information on massic activities with the corresponding 95% confidence intervals are given for eight radionuclides (3H, 125Sb, 234U, 235U, 236U, 238U, 241Pu and 244Cm). Less reported radionuclides include 60Co, 99Tc, and 242Pu. The CRM may be used for quality assurance/quality control of the analysis of radionuclides in environmental water samples, for the development and validation of analytical methods and for training purposes. The material is available from the IAEA in 5 kg units.Keywords: cesium 137; plutonium 239; plutonium 240; potassium 40; radioisotope; sea water; strontium 90; unclassified drug; uranium 234; uranium 235; uranium 236; uranium 238; analytic method; article; certification; chemical analysis; environmental factor; quality200210.1023/A:10148616207132015-12-12