cussed in earlier reports [Cronkite, et al (1956); Conard, et al (1958)] were 28 American Servicemen on Rongerik Atoll who received about 70 r and 157 Marshallese on Utirik Atoll who received about 14 r. The exposed people were evacuated to Kwajalein in the Marshall Islands by air and sea about two days after the accident. Extensive examinations were carried out during the first three months after exposure and these findings have been reported in detail (Cronkite, et al (1956)]. In view of the radioactive contamination of their home island of Rongelap, the people were subsequently moved to a village provided for them at Majuro Atoll where followup medical surveys were carried out and reported on at six months [Bond, et al (1955)], one th status of the radiation from n experimental 1 shift in winds earby inhabited ching vessel, the id of Rongelap, st fallout — an minate beta ray | absorption of a nearby island proportionately ionuclides, Dis- = 9 <\ynen v7 ~ 9 Q MARSHALL ISLANDS < v Fig. 1: ° MAJURO S Map of fallout area, Marshall Islands, March 1954 vear [Cronkite, et al (1955)], two years [Conard, et al (1957)] and at three years [Conard, et al (1958)], and four years [ Conard, et al (1959)]. By June 1957 radioactivity levels on Rongelap were considered acceptable for habitation and the people were returned to their home island. The four year post-exposure survey [Conard, et al (1959)] was carried out at Rongelap Atoll. By 1956 a large group of unexposed Rongelap people (relatives) had joined the exposed Rongelap people and returned to Rongelap with them. This unexposed group has increased in size to 200 people and served as a much better comparison population group than did the earlier comparison group of people which were randomly selected at Majuro Atoll. an DS ime,at ari C3 315