-1- 1NTRODUCTION Operation 31arshall was Because detonation of an unexpected of Bravo, the direction, Rongelap and Rongerik had an easterly explosion. evacuate exhibited children suffered after about in 1954 developed was taken The rate of occurrence ot this report from which the natives rainout as part history of air concentrations those by U. S. Task predicted of fallout Force from the personnel on Rorgelap, to the closest” and minor skin burns. Rongelap nodules natives, on their who were thyroid natives None and surface statistically. air concentration suite of codes to estimate were evacuated. of the debris clou~ crossed islands Finally, Since The plots, the doses at the We will also consider the atolls.” on the downwind glands. young has. been reported. than would be expected deposition particle-in-cell in the following persons on the atolls of high levels nodules among the Utirik is to calculate using a three-dimensional of heading nausea resultant from their exposure. non-maligment has been higher test of the series wind directions Some of the natives temporary in the [11 As a result, to relatively 10 years, of similar time. instead alignment. of these islands. point, then the occurrence nuclides. pattern, any medium or long term effects However, islands action conducted The top of the in mid-tropospheric were exposed Prompt the natives to the detonation fallout series explosive. thermonuclear shift test The most notorious to nearly 35 km at stabilization northeast nuclear [11 a 15 megaton cloud reached purpose nuclear was an atmospheric Islands from March to May of 1954. Bravo, debris Castle the dose from the calculated will be presented time for several