Table 5. Percent Contribution of Fission Products to Total A-Activity in Plankton Collected June 1956 on the Walton and Analyzed July 30 and August 29, 1956 (Values as of date of analysis) Sample . mnL490 Ceri Trivalent number Zr?? Rh rare earths Total Insolubie(5) Soluble}°} in HNO3 residue‘'’ d/n/g of wet Total plankton 1E (1) 12 15 4.8 27 20 79 11 (3} - ~ 1,800 up (1) 0 33 45 23 22 82 13. (3) 5.1 100 12,200 BA (1) 5.5 17 2.2 20 25 70 15 =(3) 4.3 89 11,700 9D (1) 10 21 1.1 20 17 69 12 »=(3) 2.1 83 158,000 3a (2) 12 28 25 82 8.4 (4) 15 105 882 6.2 (4) 10 100 6,740 ( 4) 12 101 3,680 56 5.7 (4) 14 76 56, 400 70 8.4 (4) 21 99 12,100 8.9 <8 TD (2) 12 19 2.5 34 17 84 9A (2) 11 18 2.4 32 15 78 gc (2) 12 0.6 25 16 1.7 29 8.9 10B (2) 11 9.5 12 11 No measurable vadiostrontium or radioceslum were found. 1) analyses of July 30, 1956. 2) 3 2 7 Analyses of August 29, 1956. Residue insoluble in HNO, after dry ashing at 600°C. Residue after wet ashing with ciN and HoQ5 6 Gamma ray spectrograph Pndicates this wae "2 “mixture of cel Ht. pelts 21, RytO3+106 2,10 Residual solution after completion of analyses. dangBYoPPCSTTBETA, indicates this solution was a mixture of Ce 1A palit 795° Bt Ce 141