s f o r : (1) gammae m i t t i n g r a d i o n u c l i d e s i n a i r f i l t e r s , seawater, f r e s h w a t e r , b i r d s , l i c h e n s , t e r r e s t r i a l v e g e t a t i o n , marine a l g a e , marine i n v e r t e b r a t e s , marine f i s h , sea o t t e r , aufwuchs, and f r e s h w a t e r moss and p l a n t s ;(2) strontium-90 ( 9 0 S r ) i n rats and b i r d s ; and (3) tritium (3H) i n seawater and f r e s h w a t e r . Some t a b l e s from t h e p r e v i o u s r e p o r t s were r e v i s e d by adding d a t a f o r cerium-144 (144Ce) o r europium-155 (155Eu) and d e l e t i n g r a d i o n u c l i d e s such as manganese-54 ( 54Mn) , cobalt-60 (60Co), zirconium-95 ( 9 5 Z r ) , o r niobium-95 (95Nb), which were e i t h e r n o t p r e s e n t i n 1973 o r w e r e a t levels less t h a n 0.5 pCi p e r g , d r y . The c o n c l u s i o n s from t h e r e s u l t s of t h e r e c e n t a n a l y s e s are a r e i t e r at i o n of t h e r e s u l t s s t a t e d i n Held e t a l . (1973); namely, "1) no new r a d i o n u c l i d e s are p r e s e n t ; 2) t h e most abundant r a d i o n u c l i d e s are n a t u r a l l y o c c u r r i n g beryllium-7 ( 7Be) and potassium-40 (40K) ; 3) t h e trace q u a n t i t i e s of f i s s i o n p r o d u c t s , induced r a d i o n u c l i d e s , and 3H p r e s e n t are from world f a l l o u t ; and 4) a t r a c e of 3H c o n t a m i n a t i o n remains i n some Long Shot ponds, as p r e v i o u s l y r e p o r t e d . " I t i s concluded from t h e r e s u l t s of a n a l y s e s of samples c o l l e c t e d between September , 1969, and December, 1973, as r e p o r t e d i n t h i s and t h e t h r e e p r e v i o u s p r o g r e s s r e p o r t s , t h a t t h e r e were no r a d i o n u c l i d e s of Milrow o r Cannikin o r i g i n i n t h e water, p l a n t s , o r animals of Amchitka I s l a n d .

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In 1974 the Laboratory of Radiation Ecology began a program to determine the radionuclides found in foods, plants, animals, and soils of the Central Pacific. As part of this program the present study was undertaken to determine radionuclides found in the common foods and soils in areas of Micronesia other than those areas receiving local fallout from the test sites at Bikini or Enewetak atolls. Areas sampled in 1975 were Majuro Atoll in the Marshall Islands, Truk and Ponape in the Caroline Islands, Guam in the Marianas Islands and Koror and Babelthaup in the Palau Islands. All samples were analyzed fpr gamma-emitting radionuclides while some were also analyzed for ^°Sr or 239,2topjj^ Results of the analyses indicate that naturally occurring '*°K is the predominant radionuclide in the biological samples. Cesium-137 in amounts less than 1 pCi/g (dry) was the only fallout radionuclide detected in most of the biological samples. Soil samples usually contained ^osr, ^^^Cs, ^ssy g^jj 239,2itop,j^ while soil from Truk, Palau, and Ponape also contained isotopes of radium and thorium. Soil from Guam also contained 2iop5 and ^ssjj .,•" addition to the above radionuclides. Considering only the fallout radionuclides, the values for ^^Sr, ^^^Cs, and 239,2i*opu in samples from Guam, Palau, Truk, Ponape, and Majuro are less than the values for these radionuclides in similar samples from atolls such as Utirik, Rongerik, and Ailinginae in the northern Marshall Islands, and are much less than values of these radionuclides in samples from Bikini and Rongelap atolls. i

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