Table 2. Radioactivity of the plankton. Values expressed as d/m/g of gross beta activity and c/m/cc of total gamma activity at time of collection, R.a dioactivity Sample no. Collected Date Hour Gross beta activity 10° d/m/g of dry plankton* P-1 P-2 P-3 Pp-4 P-6 P-7 P-8 P-9 P-10 P-11 P-12 5/4/58 " 5/5 " 5/6 " 5/7 " 5/8 5/9 5/10 1540 1945 1423 1950 1615 1953 1427 1637 1845 1225 1300 0.000374 0.000854 0.000346 0.000434 292.0 53.2 11.3 4.06 8.58 0,424 0.00244 Pp-14 P-15 P-16 P-17 P-18 P-19 P-20 P-21 P-22 P-23 P-24 P-25 P-26 P-27 P-28 P-29 P-30 P-31 P-32 P-33 P-34 P-35 " 5/17 " " " 5/18 " " 5/19 " " " " " " " 5/20 " " " " " 1907 1015 1405 1705 2140 1040 1830 2304 — 0858 1000 1100 1230 1352 1814 1935 2004 0101 0145 0400 0617 0855 1510 257 4.76 10,3 96.2 17.4 25.2 15,5 33.7 18.6 46.6 3.60 P-13 P-36 5/16 5/26 1609 0945 Gamma activity 106 c/m/cc of wet plankton 32.2 7.66 12.1 27.4 7.52 6.93 3.18 2.30 *Correction factor for self-absorption based on K49_ 0.200 0.166 0.182 0.286 0,220 0.100 0.125 0,080 0.0182 0.0129 0,0222 0,0432 0.0344 0.0480 wis acs AY oor |