60 Co and 55 Fe. , The concentrations of these radionuclides in edible portions of organisms. range from undetectable amounts to the following maximum values: 137 . : Cs - 2260 pCi/g dry in the muscle tissues of a curlew from Nam I. 90 Sr - 204 pci/g ary in the hepatopancreas of a coconut crab from Bikini I. 60 . Co - 219 pci/g dry in muscle and mantle tissue of a giant clam near Bikini I. 55 . , Fe -— 40,900 pCi/g dry in the liver of an ulua. The range in the amount of a radionuclide in the same tissue from the same species at the same islet is wide. detectable amounts of radionuclides are present, When the minimum and maximum values often differ by factors of four or five and sometimes by a factor of ten. The values for concentra- tion of radionuclides in individual samples are given in Appendix Tables 1 through 15. Average values and ranges are given in text Tables 1 through 15. Dry weights were used for the basic calculations because the true water content of some samples is difficult to determine. The average concentrations of radionuclides were converted to a wet-weight basis for convenience in calculating daily intake from the diet; the conversions were made by using average wet to dry weight ratios for each kind of sample.