Be The Marshallese were exposed in the open or in thatched homes as illustrated (slide 2). The lightly constructed homes and clothing gave almost complete protection against skin lesions, Bathing during or im- mediately after the fallout reduced the severity of skin burns, The gamma doses were estimated from consideration of the arrival time dose rates at various times, decay exponents, from a recording dosimeter and some film badges that were located on Rongerik. The values presented embrace all of the above factors and there was considerable internal consistency in dose estimation. Nausea and vomiting occurred on the day of exposure in the two highest dose groups. Two-thirds of the Rongelap group were nauseated and one-tenth vomited and had diarrhea. was nauseated, One of the Ailinginae group The other groups 69 and 14 r. had no gastrointestinal symptoms. Itching and burning of the skin occurred in 28% of the Rongelap group, 20% of Ailinginae and 5% of the Americans, but none of the Utirik group. Three of the Rongelap and one of the Ailinginae group had burning of the eyes with lacrimation., The cutaneous symptoms were most likely due to irradiation, since all of the ones with symptoms later developed skin lesions. However, the high pH of the fallout material when dissolved may have contributed to the cutaneous symptoms. Al] individuals were kept under continuous medical observation. All of the gastrointestinal symptoms disappeared by the third day without therapy and there was no recurrence. In the course of observation, miscellaneous disorders developed as listed in the next slide (slide 3). Initially, the URI caused some concern