UNCLASSIFIED ams Notes on Operations Aerial Crater Survey-RadSafe Party Noo 1 The C=l7 with monitor took off frem Eniwetok 30 minutes following the test. Northeast of the zero island and upwind, it encountered a small amount of fallout almost at once, but proceeded on its mission at 5,000 ft. with a background of 4 mr/hr. ~ Phaseone consisted of flights over the crater at various altitudes in order to determine the radiation intensity above the crater, It was flown at heights up to 5,000 ft. During this survey, readings were radioed in code to the USS MT MCKINLEY whenever the plane crossed an active area, Phase III included a check of the islands to the west of the test island at an altitude of 200 feet. Readings of 500 mr/hr were obtained over the three islands immediately to the west, indicating extensive fall-out on these islands. Phase II, a check of the air over the crater at 5,000 to 10,000 feet elevation, was then begun but the intensity at §,000 feet indicated negligible radiation. A further survey was made on X-RAY-plus 1, followed by a recheck i. on X=RAY=~plus 6, at which time the ground monitors were also surveying % the crater, Final analysis of these data is awaiting study of the decay curves, but it appears that excellent results were obtained. ¥ a Evidence of fall-out on the islands adjacent to the test island was later confirmed by the ground survey. . Eniwetok Island - RadSafe Party No, 2 The radsafe party in Eniwetok Island consisted of Captain Mallory “ ‘and two assistants, . The first members of this party arrived on Eniwetok Island, 30 March, A radiological safety center was established in the radiochemistry laboratory. This location was in clese proximity to the drone parking area and vroved to be ideal for the mission at hand, A TCS radio was installed by the Island Commander's communications office and continual watch was kept on this curcuit with the RadSafe Center on the MT MCKINLEY and Radops on the BAIROKO, Camplete rehearsals were held on PETER X~#AY Day with the drone landings and it was estimated | | that two monitors could handle the filter removal operation, the tolerance Limit of 3 r on this mission, After all of the filters were removed it was apparent that the,air personnel could remove their data from the drones, as well as the film badges without exceeding the O.l r for a rovta-e mission. 50014911 —_— ee +. The - At 0725 following the shot the first drone plane landed. drone planes were not parked together, This caused some confusion and it was very difticult for the monitors to keep in contact with all the personnel involv.u. However, by 1000 the top filters were unloaced and on their way to the states, None of the personnel involved received UNCLASSIFIED neeeeer es — ee — cr aT