TABLE 4. Radionuclide concentrations in surface groundwater samples (9/10/78). fci/l (4% 90)a Atoll and island Salinity, sampled? ppt 239+ 240py 905, 13766 Filtrate 238py Filter Filtrate 241 Am Filter Filtrate Filter 0.24(24) 7.3(5) Rongelap F-42 Utirik 1-6 Likiep L-37 Likiep L-37 Likiep L-2 Likiep L-2 Ailuk A-S1 Ailuk A-51 Ailuk A-2z Me jit lake Wotho M-4 Ujelang J-18 a : 1.02 2440(5) 1040(2) 3(7) 0.84 82(4) 6550(1) 0.2(22) 0.22 31212) 176(2) 0.87 125(3) 383(3) <0.1 0.12(38) <0.05 0.28 205(4) 298(1) <0.04 0.22(34) <0.04 <0.02 0.39 334(3) 41(3) <0.07 0.1(80) <0.03 <0.02 0.2(40) 0.6 143(2) 1160(2) 0.31(40) 0.25(60) <0.04 0.1(80) 0.45 144(4) 31(6) 0.28(34) 0.14(70) <0.02 0.69 450(3) 251(4) 0.1160) 0.2(60) <0.05 0.76 111(4) 7604(1) 1.5(30) 1.3(12) <O.1 0.45 33(6) 1180(2) -- 28(6) 410(2) lost <0.1 0.12(36) 9.8(7) <0.7 -- <0.05 <0.02 0.5(20) 1.1(20) <0.04 -- lost lost 0.2(60) 0.06(75) 0.1(50) 0.16(60) <0.08 0.2(50) <0.1 <0.05 <0.05 <0.1 <0.1 oe . Prom Fig. 1. 20 : <0.04 0.1(60) <0.03 Values in parentheses are the percent standard deviation of <0.01 the counting error. -- <O.1 0.13(50) <0.05 0.8(30) <0.1 0.2(50) 0.5(50) 0.13(60) 0.8(30) 0.4(40) 0.2(60) <0.2 <0.2