nth DELETED(Dakota) Project 2.66 — Early Cloud Penetration - Col. E, A, Pinson Objectives: To collect and evaluate data relating to radiation dose rate vs time in radioactive clouds from thermonuclear weapons. To measure and evaluate the radiation hazards associated with the residual contamination on aircraft which have flown through thermonuclear clouds at early times after detonation. To measure the turbulence in a thermonuclear cloud at early times after detonation. : Radiation dose rate inside the cloud vs time after detonation. The extent and quality of the residual contamination on the air~ craft after landing. Instrumentation and Techniques: There was no change in instrumentation from previous shots. The contamination studies were conducted in the same manner as before. Four Be57 aircraft penetrated the cloud. A fifth B-57 was in the air as a standby penetration aircraft in the event of an aborted mission by one of the primary aircraft. Penetrations were made at 35,000 feet at # 28 minutes, 40,000 feet at # 34 minutes, 45,000 feet at # 38 minutes and at 50,000 feet at 4 41 minutes. The altitudes listed are indicated altitudes, All penetrations were made from north to south. Lone egress NAL PG ¢ _ coun - nt