Cs/K atom ratios of marine organism of different trophic levels in Japanese coastal waters

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  • Tateda Yutaka
    Abiko Laboratory, Central Research Institute of Electric Power Industry

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  • Cs/K Atom Ratios of Marine Organisms of Different Trophic Levels in Japanese Coastal Waters
  • Cs K Atom Ratios of Marine Organisms of

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Cs/K atom ratios were examined in Japanese coastal waters and biota. The Cs/K atom ratios in <br>coastal waters, chlorophyta (3 species), rhodophyta (10 species), phaeophyta (4 species), invertebrates <br>(7 species), teleosts (15 species) were 2.1, 2.1, 1.9, 4.6, 3.5, 12 (×10-7), respectively. The Cs/K atom ratios were especially large in teleosts examined.<br> Cs/K atom ratios in organisms increased with the elevation of the trophic levelsof the organisms. An “increase ratio” of Cs/K ratio was approximately 1.62 per one step elevation of trophic level.<br> The highest Cs/K atom ratios observed in teleosts suggested both the discrimination of Cs from K in teleosts and the discrimination of Cs from K in transferring these elements along food chains.

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