in Tables 16 and 17 by weighting by of Bikini and Enewetak data on bird sample size and by assuming that muscle and liver, we are listing in detection limit values ("less than" Table 20 the Pu concentrations from numbers) were actual concentration the Enewetak Radiological Survey. >> values. The 10-, 30-, 50-, .and 70-yr inte- Table 18 lists the final radionuclide concentrations that were gral doses resulting from ingestion of used along with the estimate of fish marine foods are given in Table 21. ingested per day (600 g/da) to calcu- Strontium-90 contributes the largest late the radionuclide intake via the fraction of the bone marrow dose (70 marine food chain (pCi/da). to 80%), 13766 contributes approxi- The table also includes the concentration of mately 20%, while 600, and 239,240, some radionuclides in fish used in the contribute about 64 of the total. 1973 Enewetak assessment. whole body dose from the marine path- The way is 50 mrem for the integrated The species of birds that are readily caught and included in the 30-yr dose and 66 mrem for the 50-yr diet are marine feeders, mostly integrated dose. -species of terns. The bone marrow doses are 200 mrem and 290 mrem for Therefore, the radionuclide concentrations in their the 30-yr and 50-yr integral doses, muscle tissue are similar to that in respectively. the marine diet. are small relative to those from other For this reason, These integral doses birds and bird eggs are considered pathways. part of the marine diet for the pur- contributes a relatively significant 239,240, fraction of the total u intake, poses of dose calculation. No birds Although the marine pathway or bird eggs were collected in June Table 18. 1975, so the data used to evaluate this part of the marine food chain come from previously published | 8,31,32 reports and are summarized in Table 19. Average weighted® radianuclide concentrations in fish and clams at Bikini Atoll. Concentration, The final concentration pCi/g Wet Weight data used for dose assessment listed in Table 20 were derived assuming that six times more bird muscle is consumed Species 6006 1376, 0c, Tish 1.51 0.14 0,076 0.0028 Clams 2.06 0.011 0.0060 0.0072 than liver and that the wet-to-dry ratio is 0.33 for muscle and liver and 0.25 for eggs. Because of the absence of Pu concentration data on birds and bird eggs on Bikini and the similarity 'Enewetak Atoll 1972 Dose Assessment Fish 2.0 0.39 0.075 — “Weighted by number of fish or clams in the sample. -27- 5009911 239, 2405,