-~25- Table 4. Sr90 in samples collected aboard the USS Rchoboth May 6 to May 20, 1958. Analyses made January 21, 1959. Values expressed as d/m/gof dry weight at time of collection. Sample Date of collection Gross beta activity 108 d/m/g gr90 d/m/g gr90 per cent of gross beta activity 290 55 11 2050 12 0 0.00070 0.00002 0 P-6 P-7 P-8 Large plankton " " " " 5-6-58 " 5-7 P-10 P-12 P-13 P- 13) " " " " " " Small plankton 5-8 5-10 5-16 " P-15 P-16 P-17 P-18 Large plankton " " " " " " P-9 P-15) - ee P-34) P-35) T-7 RI tt " . " if Shrimp "tl tt tt 4. 0 8.6 0.0024 32 0 0 0 6.0 | 0 0 5-17 44.0 415 0. 00090 5-17 " " " 4.8 10 96 17 1710 441 226 3280 0.04000 0, 00400 0.00020 0.02000 705 0, 00010 0.01000 _ 1 ; 9-19 " 5-20 8.9 1030 5-18 3.2 0 Hi 0 54 0 i cS <S