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 Total—body 90s, 0.0118 25Fe 137¢, 0.0329 1.13 60¢o 0.507 652n Total internal Net external* Total 12.5 14.2 0.0267 0.0230 1.71 0.0143 0.0757 1.85 3.19 2.02 17.4 3.87 Thyroid 0.000749 0.0537 0.0603 1.70 50¢o 0.629 652n Total internal Net external* Total 17.2 19.6 3.19 22.8 0.225 5 Fe 0.0666 137os 60¢, 652n Total internal Net external* Total 0.591 4.66 15.0 20.5 3.19 23.7 0.0415 2.35 0.359 0.0101 11.1 0.0672 13.1 2.47 3.19 2.02 16.3 4.49 Testes-ovaries 0.123 0.0422 2.57 0.000749-0.000749 0.0583-0.0620 1.54-1.74 0.00169-0:0016 0.0736-0.0433 2.33-2.63 0.103 11.3-16.3 0.0685-0.0988 0.0177 2.86 2.02 4.88 0.442-1.78 13.3-19.9 0.567 0.0465 0.895 0.132 0.0910 1.73 2.02 3.75 0.0125-0.0520 2.49-2.82 3.19 2.02 16.5-23.1 Lower large intestine wall 90s, 0.00169 0.0594 1.55 Red marrow 90sy 55Pe 13765 Rongelap 4.51-4.84 Liver 0.000671 0.115 0.00152 0.0804 1.81 0.792 16.5 2.74 0.0223 0.136 22.4 5.00 19.2 3.19 2.98 2.02 *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 miltidirectional 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.). oe - 116 -