Following the intensive medical studies initially, followup exeminations of the Ronselap and Ailingnae people have been conducted eat 6 months and then at annual intexvals in March. Systematic and comparable examinations of the oa le ok Rorgelap uncxpoced population wore started in 1955 end have been conducted at least biennially. vals. People on Utirik hnve been seen at less frequent intere The pediatric surveys have also included examination of all children born after Macch 1954 to parent or parents exposcd to the fallout and to parents in the uncxposed control group. The children of exposed parents noir number &8 end children of non-exposed perents number 121. The acute early effects of fallout radiation involved primarily the skin, the heir, the gastro wea te 1? mtestinel gs stein and the hematopoietic tissues. During the first 2-day period following exposure and before evecuation from the island, itching and burning of the skin were noted. with some vomiting elso occurred. a few days with no recurrence. Anorexia and nausea These symptoms subsided promptly within A tebuletion of incidence of these symptoms (Table III) suggests that the gastrointestinal manifestations were more frequent and moze sevare among younge: children than among older children end adults ji . at. a ~ x Radiation burns resulting from deposits of fallout material on the shin developed about 2 weeks after the exposure. Hyperpigmentation, cesquamation, depigmantation, and, im severe cases dng and replecantetion eceurred duving tha 500133