CHAPTER 3 RESULTS AND DISCUSSION . . Twenty-seven penet from the detonatio These pens made through the clouds resulting ing in total yield. were macs at times of from 20 to 78 minutes after detonation. The indicated altitudes of penetration varied gener~ ally from 30,000 feet to 50,000 feet, with ons penetration being made at 20,000 feet. Fenetrations wore made through clouds from land-surface, water-surface, and air detonations,. Maxim dose rates as high as 800 r/hr were encountered in som of the early penstrations, and several flights yielded total radiation doses to the crew of 15 r, as measured by film badges, and 35 to 40 r, as measured by instrumentation more sensitive to soft gamma radiation than the film dosimters, On other flights, the whole-body radiation dose as measured by Rad-Safe film badges was as low as 100 mr. The dosage authorized by the Surgeon General of the Air Force and the Commander of Joint Task Force Seven for the aircrews on this project was 50 r, with a limiting planning dosage of 25 r for any single penetration, No pene trations were made in which the macimim dose to be expected, as mas~ ured by Rad-Safe film badges, would exceed 25 re The experimsntal plan proved to te satisfactory, and data to satisLy the objectives of this project were obtained. The data are presented in Table 3.1 The sections which follow discuss the results as they appear in the table, 3-1 TIME AND ALTITULE OF PENETRATION The times of penetration varied as indicated above. The first penetration on each shot was through the stem of the cloud, Succeeding penetrations were at higher altitudes through the intermediate zone be~ tween the stem and mishroom or through the mushroom, All penetrations below 40,000 feet were considered to be penetrations of the stem, Fen~ etrations between 40,000 and 45,000 feet were intermdiary between the stem and mushroom, Penetrations above 45,000 feet were in general through the mushroom of the cloud, 3.2 LENGTH OF TIME IN THE RADIOACTIVE CLOUD The length of time in the cloud recorded in Table 3,1 represents >the period of tim from the moment the radiation intensity reached a value of 5 percent of the maxim intensity noted in the cloud until 22 REST AVAILABLE COPY