om REress) 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 aircraft after landing, Instrumentation and Techniques Three B-57 aircraft penetrated the cloud. The first one a "Nip" penetration at A,9 minutes at an altitude of 45,000 ft. The pilot flew almost through the cloud before turning 180° and flying back out again. Time in cloud was 128 sec, The second aircraft made a "bore-through" penetration at £58 minutes at an altitude of 45,000 ft. was 92 sec, Time in cloud The third aircraft carried out two "bore-through” penetrations at 467 and 76 minutes, Altitudes were 47,000 ft and 34,000 ft while the times in the cloud were 76 and 66 sec. respectively. The dose rate and integrated dose in the cloud and on the return flight due to residual contamination on the aircraft are measured by a dose rate instrument and integrated dose meter. ents are recorded by a Photo Panel. The readings of these instrum The Photo Panel includes a "G" meter to determine turbulance in the cloud, a clock to give time in the cloud Pins IDOS t ~ tend mm - hry pe, and an altimeter to show altitude of penetration. - 28 - 2 -y 7 hy g ’