ok oe eeameTala =33- Table 9. Comparison of the gross beta activity of the total plankton and total water strained for three samples after the Wahoo detonation. Total volume Sample Date Hour P-14 5/16/58 1907 W-l1 5/16/58 1910 P-17 5/17/58 1705 W-2 5/17/58 1653 P-19 5/18/58 1040 W-3 5/18/58 1348 Water M3 Plankton ec d/m/total volume Water 8 50 d/m/f/total volume water Plankton plankton 1.7x106 4, 400 5. 2x105 11, 000 1. 1x106 3, 000 7.5x109 14. 180 5.7x1010 10 180 collected 3,3x109 in other investigations of the levels of Sr99 in marine organisms in the . (3, 4, 7, open sea 11) The low levels of Sr?9 in the plankton may be due to the low amounts » present at the time of collection and to the unavailability of gr90) which may be explained on the basis of solubility, coprecipitation with calcium carbonate, competition with calcium, and isotopic dilution by stable (7) strontium . The small fish collected after Wahoo had essentially the same radioisotopic composition as the plankton samples. A sample of dolphin liver . rho oc yor > te