Journal of Environmental Radioactivity 76 (2004) 113–137 www.elsevier.com/locate/jenvrad Spatial distribution of 3 H, 90 Sr, 137 Cs and 239,240 Pu in surface waters of the Pacific and Indian Oceans—GLOMARD database Pavel P. Povinec a, , Katsumi Hirose b , Teruyuki Honda a,1 , Toshimichi Ito a,2 , E. Marian Scott c , Orihiko Togawa a,3 a International Atomic Energy Agency, Marine Environment Laboratory, 4 Quai Antoine 1er, 98000 Monte Carlo, Monaco b Meteorological Research Institute, Geochemical Research Department, Tsukuba, Japan c Department of Statistics, University of Glasgow, Glasgow, UK Received 23 May 2003; received in revised form 11 August 2003; accepted 2 September 2003 Abstract The data stored in the IAEA’s Global Marine Radioactivity Database (GLOMARD) developed in the framework of the IAEA’s project ‘‘Worldwide Marine Radioactivity Studies (WOMARS)’’ have been evaluated for Pacific and Indian Ocean surface waters. Four anthro- pogenic radionuclides— 3 H, 90 Sr, 137 Cs and 239,240 Pu—have been chosen as the most represen- tative of anthropogenic radioactivity in the marine environment, comprising beta, gamma and alpha-emitters which are the most frequently analysed in the marine environment and which have (with the exception of tritium) the highest potential contribution to radiation doses to humans via seafood consumption. For the purposes of this study, the Pacific and Indian Oceans were divided into latitudinal boxes for which average radionuclide concentrations were estimated for the year 2000. The highest concentrations have been observed in the Japan Sea/East Sea and the North-West Pacific Ocean, the lowest in the Southern Ocean. # 2004 Elsevier Ltd. All rights reserved. Keywords: Radionuclides; Tritium; Strontium-90; Caesium-137; Plutonium-239,240; Surface water; Pacific Ocean; Indian Ocean  Corresponding author. Tel.: +377-97-97-72-72; fax: +377-97-97-72-73. E-mail address: p.povinec@iaea.org (P.P. Povinec). 1 Present address: Musashi Institute of Technology, Kawasaki 215-0013, Japan. 2 Present address: Japan Atomic Energy Research Institute, Tokaimura, Japan. 3 Present address: Japan Atomic Energy Research Institute, Mutsu, Japan. 0265-931X/$ - see front matter # 2004 Elsevier Ltd. All rights reserved. doi:10.1016/j.jenvrad.2004.03.022