some of the animals whose tissues were sampled after the exposure. It is difficult to separate oral intakes from inhalation intakes in which material was later swallowed. Table 5 gives worst case dose estimates for marrow,skeleton and gastrointestinal tract based on the initial body burdens in Table 3. f TABLE 5. Worst Case* Dose Estimates for Skeleton, Marrow, and GI Tract for the Marshallese | Islanders Based on Estimates of Initial Radionuclide Body Burdens Estimated Radiation Dose (mGy) Radionuclide Sr-89 Ba-140 Ru-103 Ca-45 _ Bone Surfaces Red Marrow 0.38 on 0,0003 0.004 0.13 0.0003 0.72 0.002 * Highest dose assuming all inhalation or all ingestion, inhalation class and solubility category chosen by worst case. For inhalation cases, intake assumed to be (Body Burden + 0.63), where 0.63 is the fraction of a 1jsm serosol inhaled which is deposited in the lung. Dose estimates taken from ICRP Publication 30. ** Smalj intestine, upper large intestine, or lower large intestine - highest estimate. 4.4.4 Additional Absorbed Doses During Rehabilitation In an analysis of the exposures to internal and external radiation sources that may have occurred during rehabilitation of Rongelap and Utirik, Lessard et al. studied the dietary intakes of cesitum-137, zinc-65, cobalt-60, strontium-90 and iron-55. Based on their analyses of excreta and on in-vivo measurements, and interpretation of biological retention functions, the authors concluded that from 1954 to 2004 the inhabitants returned to Utirik will receive an additional 0.044 Gy and that from 1957 to 2007 inhabitants on Rongelap will receive an additional 0.025 Gy from these nuclides. These dose equivalents are committed effective whole-body dose equivalents integrated over the 50 years following repatriation. The values have large uncertainties associated with them because f the uncertainties in the analyses. Standard deviations associated with the estimates of committed effective dose equivalent from individual nuclides vary from 52% to over 600%. Data onthe intake of plutonium-239 were limited, and no attempt was made to reach any conclusions about the dose equivalent received from this nuclide. From external radiation 24