‘te sos thet often . . ar ee ae eo -Ue te wt 7. St “HR a oe BT ee A ae ee tt teWhy Sek pee yeom Ry oe -~ were pe LL Tikes : et ET * in an environment where 6005 is available, the more 6006 it accumulates in the kidney, life. if 006 has a long biological half- This is not a concentration through the food web since the clams are filter feeders. The radionuclide content of bird species presents a sharp contrast, both qualitatively and quantitatively, associated with feeding habit (Table 8 and Appendix Table 10). The fairy terns and noddy terns feed mostly at sea outside the lagoon and contain small amounts of fallout radionuclides, naturally occurring 40, of 137 G5, The curlew, less than the amount of They contain barely detectable amounts © on the other hand, feeds on the reef and on Scaevola sp. seeds, and consequently contains relatively large amounts of 13766, as much as 2,300 pCi/g dry in muscle. The turnstones also feed along the beaches and on the reef, and contain both 60 Co and stones is not known, of sand particles. 1 370s. . The source of 1374. for the turn- although it could be by direct ingestion The yellowfin tuna, which are feeding on essentially the same organisms as the terns, contain about the same levels of 60 . Co as the fairy terns. The 60 . Co levels in the noddy terns are somewhat higher but still are of the same order of magnitude. Thus the area in which an animal is feeding is a factor affecting its radionuclide content, as expected, in relation to the distance from the source of the radionuclide. Department of Energy ce Historian's Offi ARCHIVES