TABLES Page 1. Radioactivity of water samples 21 2. Radioactivity of plankton 24 3. Radioactivity of all algae 27 4, Radioactivity of the seven most common algae, post shot 27 5. Radioactivity of pre-test inveterbrate samples by groups 32 6. Pre-test invertebrate samples with highest activity 33 7. Frequencies of pre and post test invertebrate ashed sample counts by magnitudes 35 8. Radioactivity of separate tissues or organs of 9. Radioactivity of all post test invertebrate different groups of post shot invertebrates 38 samples ho 10. Radioactivity of whole fish 45 ll. Radioactivity of fish compared by feeding habit l2. Radioactivity in fish tissues, pre-shot 54 13. Radioactivity in fish tissues, post shot 55 14. Radioactivity of land plants 15. Radiochemical analyses of soils and plants, 16. 17. 18. post shot (a)Radioactivity of pre-shot rats; (b)Radio- activity of post shot rats (a)Radioactivity of pre-shot birds; (b)Radio- activity of post shot birds Radiochemical analyses of sand, soil and biological samples, post test 66 67 80 19. Comparison of radioactivity of two species of sea cucumbers, post shot 102 20. Radioactivity of samples summarized by groups and islands 105