year period.The standard deviation was in general 30% of the mean value for all ages and sex subgroup distributions. Thie lees pronounced variation may be due tv . : 0 the fact that $525 measurements took place over @ 3 year interval while 9 Sr and 1376, occurred over a 23 year interval and thus was contained in a more homogeneous population than were the longer lived nuclides. . iy t f "4 Figures 22 and 23a and 23b summarize the 905, dose equivalent results for individuals at Rongelap. In this analysis, only the ingestion pathway was considered important. Some radioactivity would enter the body vie the resuspension and direct inhala- tion pathways. It is known that for a given soil concentration of ‘the stab!c 45 » naturally occurring analogs .to the radionuclides considered here, the ration oe of food and fluid intake to blood relative to airborne intake to blood, are as ‘ follows: Co > 3000 zn > 130 Fe > 550 Sr > 10,000 4 Cs > 400 Thus, dietary intake of radioactive material is the principal pathway leading to 8 internal deposition. a This applies to most nuclides in the environment, however, aN ait there are notable exceptions including I, U, and Pu, ay External Exposure wi aM A-value af .7J rade in tiseue of interest per rantgen, measured in air at s One meter above the surface, was used to convert exposure in air to absorbel dose X in tissue. : The source was assumed to be an exponential diacribution of 17s ac- tivity with depth in soil, typical of aged fallout (Be70). Because of the multidirectional nature of the source, variation of absorbed dose with depti of organ was minimal. Additionally, external doses were adjusted for living pat 43 7