Operations: Sampling devices on F-84, WB-29, and B-36 aircraft were used to obtain nuclear debris samples close in to the detonations. Long-range calibration samples were also collected by WB-29 aircraft. Aircraft generally did not enter the cloud until 2 hours after burst; the clouds were followed for 5 to 7 hours while samples were being obtained. Collection of close-in particulate samples was under the technical direction of LASL, gas sample collection was supervised by Hq USAF, and gas separation and some analysis was performed by UCRL. Shots: All. Radiation Exposure Potential: Exposure potential existed for aircraft crews, aS well as for those processing samples upon the aircraft's return and those decontaminating the aircraft. Staffing: Five people were definitely associated with this project, three from the 1009th (two civilians, one military), one civilian from LASL, and one civilian from UCRL. Table 19. Their exposures are presented in Exposures for personnel from other task groups, notably TG 7.4, are given in Table 87. Project Report: Reference 77. Cloud Photography (Program 9) 3 A single project, Project 9.1, made up this program in order to determine the rise rate of the cloud and the height at which the cloud ceased to rise. Project 9.1 -- Cloud Photography Agencies: Operations: Edgerton, Germeshausen & Grier, Inc. Lookout Mountain Laboratory (LML) 1090th USAF Special Reporting Group (EG&G) Technical aerial photography was conducted by LML, with backup ground photography by EG&G in conjunction with its photography work for LASL. One RB-36 and three C-54 aircraft, each equipped with two cameras, flew one mission per aircraft for all six shots. flights were 40 to 100 nmi (74 to 185 km) 199 from ground zero. The