Abstract The results of radiometric and radiochemical analyses of samples, exclusive of land plants, collected at Bikini Atoll in 1969 are presented and discussed. Average values for radio- nuclides in food items in pCci/g wet are: reef fish, 6005-2.6, 90sry-.08, 137cs-.13; pelagic fish, 60co-.94; spiny lobster, 60co-.12; giant clams, turnstones, ©9co0-7.7, 60c9-24; curlews, 60co-.94, 137¢s-380; 137os-56; terns, ©%o-1.1, 137a5-~.08. Average concentrations of ?[sr in the muscle of coconut crabs from Bikini and Enyu Islands were 12 pci/g wet and .05 pCi/g wet, respectively. There are no striking differences between the 1967 and 1969 average values for edible foods of marine origin, including the sea birds. Predominant radionuclides in undisturbed soils in 1969 are °9Fe, 1376s and 207pi. 207pi predominate. ©9co, 652n, 90sr, 125sp, In the crater sediments 55Fe, 60Co, 20cr, and There are quantitative and qualitative dif- ferences in radionuclide content associated with the feeding habit of fish and there appears to be an increasing concentration of some radionuclides with increasing age of fish and clams. The radionuclide content of bird species presents a sharp contrast, both qualitatively and quantitatively, associated with feeding habit. It appears that some 6009 and 7297p: is being transported eastward by the bottom current in the lagoon. viously Silver-108m, pre- unreported in fallout, was found in the hepatopancreas of the spiny lobster. The present levels of radionuclides and their distribution at Bikini are not likely to change significantly except for decrease in amounts, due to physical decay. Energy Department of fice Of storian’s - fi 5002434 ARCHIVES