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 90cr 0.0118 55Fe 137o¢5 0.0329 1.13 60co 0.507 657n Total internal Net external* Total 12.5 14.2 3.19 Thyroid 0.0267 0.000749 - 8.0230 1.71 0.0143 Total internal Net external* Total 19.6 3.19 22.8 0.123 0.0422 2.57 0.0177 0.103 2.86 0.0101 ll. 0.0672 13.1 3.19 3.87 0.0537 0.0603 1.70 0.629 17.2 0.0415 2.35 0.359 0.0757 2.47 2.02 16.3 Red marrow 90g, 55Fe 1376, 60¢, 652n 0.00169 0.0594 1.55 1.85 2.02 17.4 Rongelap 4.49 Testes-ovaries 0.000749-0.000749 0.0583-0.0620 1.54-1.74 0.442-1.78 11.3-16.3 2.02 4.88 13.3-19.9 0.00169-0.0016 0.0736-0.0433 2.33-2.63 0.0125-0.0520 0.0685-0.0988 3.19 2.49=-2.82 2.02 16.5-23.1 4.51-4.84 Lower large intestine wall 90s_ 0.225 I3los 60¢q 6520 0.591 4.66 15.0 I5Fe Total internal Net external* Total 0.0666 20.5 3.19 23.7 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 0.00152 0.0804 2.74 0.0223 0.136 19.2 2.98 3.19 2.02 22.4 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., etc.). - 116 - standing, Sitting, fishing,