requirements. Thus, during the 5 hours between evacuation and detonation, unpredicted shifts in forecast favorable winds could increase the fleet fallout hazard. Two distinct time periods of hazard were recognized: a prompt-effects period, where protection was required against the primary radiation effects occurring at the time of detonation; and a delayed-effects period, where protection was required against descending fallout and at places made radioactive by the prompt radiation or the fallout. Protection Falee against the prompt radiation was effected by the removal of people to safe Ih jten of the~~, the complete evacuation distances from ground zero, jwhich entailed see ae ayaa etter pre aneninsye atoll for the MIKE shot/ Protection against the delayed effects (by far the largest area of IVY radsafe planning) included the use of instruments designed to indicate both the presence and intensity of radioactivity at . a . . .oS pas given places, ‘conducting area radiological reconnaissance, maintaining ~~ contamination situation maps, posting of hazardous areas, minimizing the Spread of contaminated materials into uncontaminated areas, ne and using decontamination procedures. Lest ecqnr teeny Wad The . ma. aren, Control WIAS on of enitu ) ime Kea Vs mg \ (soap FW Re eobablivheneni aw VWae A \ ae at Cla. Zany canitel &x: ye Reeset Caer woe ; 1 . ‘| RADSAFE PLANNING The Chief, JTF 132 Technical Operations Branch (J-3), was also the Chief Radsafe Officer. As such, he was responsible for advising the CJTF on the measures necessary to ensure the radiological safety of all test 2-2 -