~ PInyat ping anes OF PUL Lisl fre ~4- ONL UCRL-12273 The dose to she thyroid in rads from all three isotopes Is, thus, 35.4 times the dose due to yet alone for inhalation and 2.6 times the yt dose for oral ingestion. Delay in reaching the thyroid efter inhalation or ingestion would lower these factors somewhat. However, the I ie daughter of the 78 hr met? has been neglected and would approximately compensate for decay of 1199 and rm before reaching the thyroid. We can now proceed to estimate the dose to the thyroids of 53+ 4 year old girls assuming (1) inhalation as the mode of intake and (2) oral ingestion. 1. Inhalation: The ratio of volume of air respired by a 3 - 4 year old girl to that of an adult can be estimated in two ways: (a) from the maximum rate of oxygen intake (7) and (o) from tHe vital capacity 2) and maximum respiration rate. (7) Both methods give ¢e ratio of ~0.%. The thyroid burden of these children would then be ~3.4 pe’ with a range of Le 7 - 6.8 pe. Assuming the + Rongelap children are similar to those of New York children, the mass of the thyroid of the children 1s 2.5 t 0.6 grams. 9) The most probable dose froin yt is then 150 rad and the dose from all isotopes 1s 510 rad. If we consider the range of thyroid burden (1.7 - 6.8 pc) and the variation in thyroid weight (1.9 - 3.1 gms), the dose is in the range ’ of 20 - 1350 rad. 2. Oral Ingestion: | At the time of the event the Rongelap people were on 4a water ration of one pint per day. They were warned not to drink water after the event but most of them admitted they drank water anyway. 00) The method of collecting water. by runoff from roofs into cisterns mekes it vory Likely that this was the main source of oral ingestion. There sre reports that it "yeined a little" on the afternoon of March 1 (D-Day). reported that the "water turned yellow." most likely source is dried fish. ° aaa a rc 7 ‘ As far es food is concerned, the Fish were dried on open racks. OFFIC USE ONLY “ert he village doctor Pie However,