3 Pandanus and coconut samples contg ined, as is common for plants 1550" the Heese Islands, naturally occurring *~K and fallout radionuclides !3/Cs and Of the three Pandanus and three 9gconut tissues analyzed, the edible fruit of the Pandanus had the highest | Cs values, 15 to 31 pCi/g: Strontium 90 was highest In the leaves of the Pandanus. limits of detection. Plutonium levels were below the Three species of fish were collected at Rongerik Atoll. Potassium-40 was ths only radionuclide present in quantities above 0.6 pCi/g. and Cs levels were Tess than 0.6 pCi and of detection. Cobalt-60 7“¥Sr values were below the limits The 137¢5/40x ratio in the three coconut crabs from Rongerik was 2.5+0.6. Cesium-137 values in the muscle and hepatopancreas averaged 29 and 10 pCi/g, {dry} except in one hepatopancreas sample which had a concentrationngf 4.3 pCi/g. In the exoskeleton Osr levels averaged 44+5 pCi/g, while 13/cs levels ranged from 2.5 to 3.5 pCi/g. Utirik Atoll In April and November, 1974, samples of soil, plants and marine organisms were collected at Utirik Island. These samples were analyzed for gamma- emitting radionuclides and some were also analyzed for 90Sr and/or Pu. Results are shown in Appendix Tables 9 (fish), 12 (soil), 13 (plants), and 14 (clams). Five surface soil samples collected in the interior of Utirik Island had radionuclide concentrations of less than one pCi/g except for Cs and 90sr values which averaged 2.8+1.6 and 2.7+1.7 pCi/g, respectively. The edibl¢ fruit from a Pandanus plant located near the center of Utirik Island had a !3/cs level of 67 pCi/g. No other fallout radionuclides were above the limits of detection. Bananas from Utirik had low levels of fallout (0.5 pCi/g or less) in the edible portion of the fruit. The marine organisms, fish and Tridacna clams, collected in the lagoon (sec Ut iptk Isang. had low levels (<IpCi/g) of the three fallout radionuclides Co, 90Sr and 7Cs) measured. Naturally occurring 40k values averaged out 8 pCi/g in the tissues of fish and clams. Rongelap Atoll Samples of soil, plants, fish, clams, and coconut crabs were collected on several islands of Rongelap Atoll in April and November/December, 1974. All samples yere analyzed for gamma-emitting radionuclides and selected samples for 9¥sr and Pu. Results of these analyses are shown in Appendix Tables 6 (coconut crabs}, 9 (fish), 13 (plants), 14 (Tridacna clams), and 15 through 21 (soil). Coconut crabs were collected from six islands in Rongelap Atoll. Four were from the southern islands of Arbar and Busch (lowest radiation levels at Rongelap), five were from the northeastern islands of Mellu and Kabelle (medium radiation levels) and four were from the northern islands of Lukuen and Lomuilal (highest radiation levels). The mean 137cs and 90Sr levels in the muscle tissue of the coconut crabs is shown in Figure 3. Levels of 99sr and '3/Cs are highest in coconut crabs collected on the northern and northeastern islands of Rongelap Atoll. “ DOE ARCHIVES