IJWVRENCE LIVERMORE LABORATORY Biomedical & Environmental Sciences Divisions 410027 R Dr. Bruce Wachholz Department of Energy Office of Technical Impact, Office of Environment Washington, D.C. 20545 E-201 Dear Bruce: Enclosed are the updated draft form dose assessments for both Enewetak and Bikini Ato~~s. Neither dose summary includes the lung and bone doses via inhalation pathway because we base the inhalation assessment on the data which EG&G is in the process of correcting. The target organ for transuranics via the inhalation pathway is not bone marrow or wholebod but endosteal cells and cortical bonet ~refore, the doses from 137Cs, 90Sr and the transuranics are not additive. I emphasize again that the assumed dietary intake is very critical to the final calculated doses. We have used for both the Enewetak and Bikini assessment the dietary results obtained from the Ujelang Dietary Survey (UDS). We did this because of the similarity of Bikini and Enewetak Atolls and the similarity in the history and current customs of the people. The diet survey was presented in detail in the draft report and appendices. The UDS is the most complete dietary assessment currently available to us. However, from various literature reports and from preliminary results from Dr. Jan Naidu’s work, it is very clear that dietary intake is very specific to a given region or atoll and greatly reflects the customs developed over the past 20 or 30 years. In summary, the diet is a very important and variable phase of the dose assessment; people who read and interpret our results should be aware of the assumed diet which is an integral and critical part of the assessment. Sincerely, ,..,” ..... , ., WLR/mt encl. UniversMy ofCalifor”: P.O.BOX5S07 Ltvennore, California 94550 Telephone[415] 422-5 758 FTS532-5758 TwK91O-386-8339 DOELLLLVMR ‘,-”)=U,Y:. ‘\ .k> Wi’l+Tam L. Robison<” Section Leader Terrestrial & Atmospheric Sciences