C. Dose - Effect Relationship Civil defense operations will always be ca ried out under tne philosophy of the letct possible radiation ex osure consistent with the mission. The greatest possible protecti will be the goal of all facilities and procedures for the pub ic, For orientation and quick reference the following sta ments will be paraphrased from "Health and Special Weapons Defe e", A.C. ll-l cublished by FCDA in 1950 and from “Emergency Exp ures to Nuclear Radiation”, T.B, 11-1, published by FCDA in 1952. Less than 25 roentgens of whole body exposure to gamma rays ov of time will not result in obvious injury. Doses will produce nausea and vomiting in some individ seriously affect the working efficiency of a grou would probably prove fatal to some 50% of people or more would probably be fatal. Somewhat larger a brief space f about 100r s but will not About hoor 600r exposed. Hoses are required to produce a given effect if the radiatic n is received over several days or in intermittent exposures. D. Probability of Extensive Radiological Cc ntamina tion Radiological contamination, although in no ense exclusive to high-yield thermonuclear detonations, does bec e a@ matter of major concern when @ large weapon of the type use in the 1954 Pacific tests is exploded near the ground. lout of The f radioactive materials from such an explosion may, under certain circumstances, settle over wide areas far removed from the point of detonation, E. Distances and Areas The areas seriously affected by heat and b st of a thermonuclear weapon are large, but are small indekd compared to the area of residual radiation hazard produced by fal ut. Because of the many uncertainties, especially wird direction nd speed at DOE ARCHIVES