Palen sama aDestocks delle RakDall a oe AE Transuranics in Bikini Lagoon oy oe Lot | TT + T boil 7 TT TTT Jot y piv 0.1 tisiidt 1.0 TUT Ty T TT 10 1966[. NUMBER i972 Period of nuclear test series at Bikini Atoll pCi/g 2560 (0.9229) 36. 642.2 (0.023) 35.2 36.140.8 (0.0222) 39.14+0.6 (0.0239) pur ©39py 19747 1976, 46.9 37.523.8 “241 1968 | 19700 46.5 TOTTI TOTO TT TTT TTT TOT TT ty 4098 of 239 py and Plutonium Isotope Ratios in growth sections 1954-1956 BIKINI 42.7 CORAL 31.3 28.6 32.8 39.6 30,176.21 (9.0184) 36.2 3072 21.085.5_ (0.9128)5 28.7 3584 a eee ee ee pe ee ee eu es es and, 395 100 735 2048 Estimated year of coral growth analyzed Fig. 5. 1586 CHANNEL 4 3.69; + of coral growth. 392420 126447 tion analyzed. cal separation from the coral (such as *°Fe) and known to be present in atoll samples (Welander 1969) were not determined. The concentration of 7°°Pu and the plutonium isotope activity ratios in each annual eee 1024 1296, L. emp Concentration of **Pu and the plu- tonium isotope activity ratios in each annual sec- band, decay-corrected to year of coral growth, are shownin Fig.5. In surface water samples collected from the north equatorial current or east of Bikini, the °*°+?40Pu concentration averaged 0.4 fCi liter? (Noshkin et al. 1974); the average in 10 filtered lagoon samples (ranging from 79-4 fCi liter?) was 40 (Noshkin et al. 1974), The Sr concentration in the lagoon averaged 570 fCi liter compared to 71 in the surface waters oute Fig. 4. ow detection ‘3 TANNVHD YId SINNOD Gamma-ray spectrum of the 1954-1955 growth section. Unidentified photopeaks are from background and naturally occurring radionuclides.