TABLE 3. Concentrations of anthropogenic radionuclides in the muscle and mantle of clams collected from the Northern Marshall Islands during 1978. Radionuclide concentration (pCi/kg wet wt)? Atoll and island Species Tissue Oo, 1370, 23854 23942405, 2a <0.03 <0.06 606, Likiep (L~50) Hippopus hippopus Muscle <1.4 <0.9 <0.03 Likiep (L-31) Tridacna squamosa <0.7 <0.15 0.33 (37) <0.05 <5 (50) <3 <0.04 0.18 (45) <0.04 23 (14) <1 <0.09 <0.2 <4 Mantle Muscle <1.4 Mantle 1.1 Taka (H-1) Hippopus hippopus Taka (H-4) Hippopus hippopus Muscle Muscle Taka (H-4) Tridacna gigas Mantle Hippopus hippopus Ailinginae (C-24) Tridacna squamosa Ailinginae (C-24) Hippopus hippopus Wotho (M-17) Bikar (D-1) Hippopus hippopus Hippopus hippopus Hippopus hippopus Bikar (D-1) Tridacna crocea Ailuk (lagoon) Tridacna squamosa Ailuk (A-11) Tridacna crocea Rongerik (G~1) Tridacna gigas 2.2 (40) <0.3 <3 <2 <0.07 0.2 (50) Mantle <2 <2 <0.05 <2 <2 <0.09 Mantle 0.9 (50) <0.9 <5 -- Muscle <1 <0.8 Mantle <2 <1 Muscle Mantle Wotho (M~1) <5 <0.03 Muscle Mantle Ailinginae (C-15) 0.9 (24) <2 1 (50) <0.8 <0.3 <0.3 0.17 (40) <0.09 <1.3 <0.03 <1.3 0.09 (80) <0.07 <2 0.4 (34) <0.3 <7 0.37 (27) <0.09 <0.05 0.13 (37) <0.4 4.5 (18) <0.03 0.27 (35) 14 (21) <0.09 <0.05 1.2 (29) <5 <2 <«l 0.33 (34) lost <1 0.09 (50) 2 (10) 0.5 (25) «1 0.19 (75) 0.39 (50) <0.05 1.1 (11) <0.2 <1 0.42 (37) 17 (25) Muscle <5 -- <0.01 0.09 (39) 0.1 (50) Mantle <0.7 <0.1 <0.12 0.24 .(75) 0.21 (50) <3 Muscle <1.8 <0.5 <0.4 Mantle <0.6 0.5 (60) 0.22 (70) 0.13 (60) 0.7 (70) <3 0.28 (20) 0.1 (45) <3 <2 <4 <0.4 Muscle <1.2 <1 <0.02 0.1 (50) Mantle <1.3 <1.2 <0.02 0.19 (30) Muscle <2 9.1 (13) <0.09 Mantle <0.7 0.5 (58) <0.02 All? 4 (40) <0.7 & (60)_—<1.7 19 0.17 (16) 1.77 (16) <0.07 <3 0.2 (80) Muscle 0.05 (60) <0.03 0.12 (30) Mantle ail? 2.6 (38) <0.07 <0.1 <3 0.5 (36) 0.34 (43) <0.02 <3 0.38 (45) <3 <0.03 0.2 (30) <0.2 0.4 (40) <0.06 <3 <4 «3 <3 <3