-l&.-‘ Dunning's eStausace is ot%ewhat hicner than that derived in this paper frogs the Windscile evidence because he assumed that 100 per cent of aerosited iodine 121 i: herbdvage, whereas wo assum? only $C per cent. retiined on edible Hisner ver is a figure based on experiments by 8. J. Garner, who observed the transfer of iodine 131i from the diet of cows to their milk.” Based on Garner's data 1.01) Fh me yields u 34 rad dose to the infant thyroid, for continous ingestion. Thus empirical evidence indicates as range for the infant thyroid dose due to a siven deposition of iodine 1351 on an area where mil’: cows graze. Using the steps described earlier, it is possitl?e to estimate the thyroid dose on the basis of external beta and gamnu intensities. For example, a gamma intensity of 30 milliroentgens/?..:.r at Belmont, Nevada, 8 hours after an vxplosion on 28 May 1957 indicates an iodine deposition of 650 uc/em® ana a possible resultant peak level in milk from cows eating grass in the area, of from 260,000 to 1,040,000 wzofliter of milk. The dose to an infant's thyroid fron con= tinued invzestion of this mill would probably be between 32 and 214 rads, Or, using beta readings, the average beta count at Salt Lake City on May 7, 1952, for example, was 23 ,000 ,000 disintegrations per minute per square foot (d/n/ft 2), this would bo e:pected to lead to infant thyroid doses of from 34 to 15 rads.