Table 4. Cumulative (1979) dose equivalent summary (rem) for adults (classified as persons >16 years of age upon return to Utirik in June 1954 or to Rongelap in June 1957 and having a mean body mass >60 kg). Nuclide Utirik Rongelap Utirik Totai-body 90sr 55Fe 137¢5 60¢5 6520 Total internal Net external* Total Thyroid 0.0118 0.0329 1.13 0.507 12.5 0.0267 0.0230 1.71 0.0143 0.0757 17.4 3.87 14.2 3.19 1.85 2:02 Total internal Net external* Total 0.000749 0.0594 1.55 0.359 11.1 0.00169 0.0415 2.35 0.0101 0.0672 16.3 4.49 13.1 3.19 Red marrow 0.0537 0.0603 1.70 0.629 17.2 19.6 3.19 22.8 Rongelap 2.47 2.02 Testes-ovaries 0.123 0.0422 2.57 0.0177 0.103 2.86 2.02 4.88 0.000749-0.000749 0.0583~-0.0620 1.54-1.74 0.442-1.78 11.3-16.3 13.3-19.9 3.19 16.5-23.1 0.00169-0.0016 0.0736-0 .0433 2.33-2.63 0.0125-0.0520 0.0685-0.0988 2.49-2.82 2.02 4.51-4.84 Lower large intestine wall 0.225 0.0666 Total internal Net external* Total 0.567 0.0465 0.895 0.132 0.0910 1.73 2.02 3.75 0.000671 0.115 1.81 0.792 16.5 19.2 3.19 22.4 0.00152 0.0804 2.74 0.0223 0.136 2.98 2.02 5-00 *A value of 0.73 rads in tissue of interest per roentgen measured in air at one meter above the surface was used to convert exposure in air to dose equivalent. The source was assumed to be exponential distribution of 137¢, activity with depth in soil, typical of aged fallout (B.G. Bennett, Health Physics 19:757-67, 1970). Because of the multidirectional nature of the source, variation of dose with depth of organ is minimal. External doses are adjusted for lifestyle variations (e.g., standing, sitting, fishing, etc.). - 116 -