-1l1Terrestrial Food Chain - 241 am data were not included in the dose assessment because it was not detected in any of the edible food chain samples. 239 ,240 Pu was detected in terrestrial products and the relative Significance of Pu was evaluated for this pathway. 239,240 Pu contributes less than 0.001% of the bone (the critical organ) dose via this pathway.* InhalationPathway - 24 was not evaluated via this pathway. Page 10, lines 10-14 - "The radiological survey is seriously inadequate with respect to americium distribution in both vegetation and in edible marine life to assess the consequent body burdens and health consequences to future atoll inhabitants." Comments: A more precise estimate of the relative increase in 241an levels and the potential concentrations of 24dAn relative to 239,240, can be made from data available in "Enewetak Radiological Survey", NVO-140, 1973, (Ref. 1), from a report by V. E. Noshkin, et al., "Transuranics at Pacific Atolls, 1. Concentrations in the Waters at Enewetak and Bikini," UCRL-51612, 1974, (Ref. 2), and from more recent data of Noshkin at Enewetak Atoll (unpublished) (Ref. 3). These data are considered for several different compartments at Enewetak Atoll. Water Concentrations a. One crater and on lagoon sample have been analyzed for both 24boy and 23932405, phe 241p,,)239,240, u ratios were 1.14 and 2.56 with a mean of 1.85 and a standard deviation of 1.0. *xAfter maximum ingrowth of 24am, This average ratio the 241 am concentration will be approximately 40% of the 23942404 present. Assuming that the Am uptake of americium in soils by food plants is an order of magnitude greater than for plutonium and that the absorption of Am across the gastrointestinal tract is two orders of magnitude greater than for Pu, the Am contribution to the bone dose is still less than 0.5% of the total dose. With time the proportion of dose resulting from the transuranic elements will increase due to a decrease in the total dose resulting from the radioactive decay of many of the fission products.