OPERATION REDWING - DATE: TIME: PPG Tine 3 Jul 1956 O606 Mohawk GMT 2 Jul 1956 Sponsor: 1806 SITE: UCRL PPG - Eniwetok - Ruby 11° 162° 30’) 18' Site elevation: HEIGIT OF BURST: =—-38" 39" oN E Sea level 300 ft TYPE OF BURST AND PLACEMENT : Tower burst over coral soil CLOUD TOP HEIGHT: CLOUD BOTTOM HETGUr: 65,000 ft MSL 42,000 ft MSL REMARKS: The dose-rate readings on the islands of the atoll were takenby aerial and ground surveys of scientific projects between H+9 hours and H+56 hours. The experimentally determined gamma field decay exponent as used to extrapolate the dose rate readings to H+1 hour. Extremely heavy locai contamination resulted on Ruby. In addition, signivicant amounts of contamination were deposited on the northern islands of the atoll. The readings taken between sites, Janet and Olive, were corrected for the small dose rates observed there before the shot. No such corrections were applied to sites, Pearl and Sally, because the contamination from shot Mohawk was so heavy that the preshot dose rates could be neglected. The readings in the vicinity of the crater were taken between H+32 hours and H+56 hours. The average field decay exponent was used to extrapolate the readings to H+l hour. Approximately 2 hours after detonation, light fallout started ori Elmer and continued for one hour. Peak intensity was 22 mr/hr. 158