. dole arem TL ICAL ASPECTS OF FALLOUT PROM vO 1. Medical evaluation of personnel exposed to the radiation fros fall~ont in case of BRAVO depends to a great extent upon the accuracy with which dosage can be computed. Based upon extrapolation of fall-out tins from Rongerik data where the fall-out time was precisely determined by automatic recording instruments, it seams plansible to emelude, after making allowance for factors giving naxiama values of time and intensity, that personnel were not axposed to dosages mich higher than calenlated. This is particalarly true inasmch as Rongerik calculations were in good agreenent with observed film badge data on personne) there. 2. The association of symptoms with a given dosage may lead to ex roneous conclusions «ince such tabular relationships have been devised only for whole body penetrating radiation given over a period of a feu einutes. It is now generally believed that the symptoas in those tabule- ~ tions will appear with a mnaller dose than indicated. ‘These personne) aay develop signs ar syaptons out of proportion to what would have previously bees axpected but could be sanewhat tempered by the relatively slow dose race characteristic of fall-out. 3. With respect to natives, due to the language difficulty, it was extresely dozbdtful that information obtained by questioning would be re= oo, iiable. he We may draw certain conclusions, however, which seem to be sound concerning immediate prognosis based upon the doses believed te have bess received. 5. Considering the personnel involved in exposure to radiation thay can be grouped according to location: a. Bongerik ~ wenty~eight Americans were exposed showing fila badge read- ings ranging from 40 to 98 roentgens during a period of 28.5 to 35 hours. They were evacuated to Kwajalein. . It was not expected that any of these pen would develop any subjective symptoms. Ons admitted to feeling badly until reassured after which he adritted that his feeling was probably psychologied&. tribution. First blood counts taken on D plus 1 showed a normal aise Generalised lose of hair which usually occurs after 10 days with sufficient dosage was not expected and has not occurred to date. Levels of pereomme) contamination were not exceedingly high and inassmach as decontarination was performed on D plos 1, bete burns are unlikely.