i5 in an environment where 6065 is available, the more 600, it accumulates in the kidney, if 6000 has a long biological halflife. 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 1374... 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 6006 and 1375, stones is not known, of sand particles. The source of 13765 for the turn- although it could be by direct ingestion The yellowfin tuna, which are feeding on essentially the same organisms as the terns, same levels of ©006 as the fairy terns. contain about the The 60% 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. of Energy Department fice Histcrian’s Of | , ARCHIVES