Table 4. Cumulative (1979) dose equivalent summary (rem) for adults (class- ified 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 Total-body 90sy 5Fe 137¢, 605 6°20 Total internal Net external* Total 0.0118 0.0329 1.13 0.507 12.5 14.2 3.19 17.4 Rongelap Thyroid 0.0267 0.000749 0.0230 1.71 0.00169 0.0594 1.55 0.0143 0.0757 0.0415 2.35 0.359 11.1 1.85 2.02 0.0101 0.0672 13.1 3.19 3.87 2.47 2.02 16.3 Red marrow 4.49 Testes-ovaries 90s, 55Fe 0.0537 0.0603 0.123 0.0422 0.000749-0.000749 0.0583-0.0620 60c, 0.629 0.0177 0.442-1.78 1376, 657n Total internal Net external* Total 1.70 17.2 19.6 3.19 22.8 2.57 0.103 2.86 2.02 4.88 1.54-1.74 137¢. 6065 657n Total internal Net external* Total 0.225 0.0666 0.591 4.66 15.0 20.5 3.19 23.7 0.567 0.0465 0.895 0.132 0.0910 1.73 2.02 3.75 2.33-2.63 0.0125-0.0520 11.3-16.3 0.0685-0.0988 13.3-19.9 2.49-2.82 3.19 2.02 16.5-23.1 Lower large intestine wall 90s > 3 5fe 0.00169-0.0016 0.0736-0.0433 4.51-4.84 Liver 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¢5 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 -