Table I e Ratio of Doses for the Two Modes of Intak Oral Ingestion Inhalation 133 I 135 /131, I /131, 133 I /131, 135 I /131, Decay 0.68 0.31 0,487 0.148 Fission yield”) 1.38 1.23 1.38 1.23 Energy 2,00 1.50 2.00 1.50 1.85 0.57 1,35 0.27 Net Factor The dose to the thyroid in rads from all three isotopes is, foys: 3.4 times I dose for oral I alone for inhalation and 2.6 times the the dose due to Delay in reaching the thyroid altes inhalation or ingestion,yould ingestion. Te I daughter of the 78, B lower these factors somewhat. However, the bas been neglected and would approximately compensate for decay of I before reaching the thyroid. I and We can now proceed to estimate the dose to the thyroids of 3 - 4 year old girls assuming (1) inhalation as the mode of intake and (2) oral ingestion. lL. Inhalation: The ratio of volume of air respired by a 3 - 4 year old girl to that of an ady 5 can be estimated in two ways: (9a) from the maximum rate of oxyggn intake and (b) from the vital capacity and maximum respiracion rate, Both methods give a ratio of 0.3. The thyroid burden of these children would then be ~3.4 pe with a range of 1.7 - 6.8 uc. Assuming the Rongelap children are similar to those of New York (9) children, the mass of the thyroid of the children is 2.5 + 0.6 grams. The most probable dose from 131, is then 150 rad and the dose from all isotopes is 510 rad, If we consider the range of thyroid burden (1.7 - 6.8 uc) and the variation in thyroid weight (1.9 - 3.1 gms), the dose is in the range of 200 - 1350 rad. 2. Oral Ingestion: At the time of the event the Rongelap people were on a water ration of one pint per day. They were warned not to ATtBy water after the event but most of them admitted they drank water anyway. The method of collecting water by runoff from roofs into cisterns makes it very likely that this was the main source of oral ingestion. There are reports that it "rained a little" on the afternoon of March 1 (D-Day). The village doctor reported that the "water turned yellow." As far as food is concerned, the most likely source is driei fish. Fish were dried on open racks. However, in the interviews none of them listed dried fish as having been eaten during #1