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  • 1 Marine Environment Laboratories, International Atomic Energy Agency, 98000 Monaco, Monaco
  • | 2 Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia
  • | 3 Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
  • | 4 NSF-AMS Facility, Physics Department, University of Arizona, Tucson, AZ 85721, USA
  • | 5 IsoTrace Laboratory, University of Toronto, Toronto, ON M55 1A7, Canada
  • | 6 University of Sevilla, 41092 Sevilla, Spain
  • | 7 Tandem Laboratory, Uppsala University, 75120 Uppsala, Sweden
  • | 8 Institut de Ciencia i Tecnologia Ambientals, y Departamento de Física, Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain
  • | 9 AMS Management Section, Aomori Research and Development Center, Japan Atomic Energy Agency, 4-24 Minato-machi, Mutsu-shi, Aomori-ken 035-0064, Japan
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Abstract  

A certified reference material designed for the determination of 129I in seawater, IAEA-418 (Mediterranean Sea water) is described and the results of certification are presented. The median of 129I concentration with 95% confidence interval was chosen as the most reliable estimates of the true value. The median, given as the certified value, is 2.28 × 108 atom L−1 (95% confidence interval is (2.16–2.73) 108 atom L−1), or 3.19 × 10−7 Bq L−1 (95% confidence interval is (3.02–3.82) × 10−7 Bq L−1). The material is intended to be used for standardization procedures applied in accelerator mass spectrometric laboratories. It is available in 1 L units and may be ordered via IAEA web side (www.iaea.org).