OPERATION REDWING - DATE: TIME: PPG Time 5 May 1956 O625 LaCrosse GMT May 1956 1825 Sponsor: SITE: TOTAL YIELD: 40 kt Depth: Lip: 12° 33' 162° 21' 28" 18" HEIGHT OF BURST: Time to lst minimum: 18 to 34 msec Time to 2nd maximum: 190 to 254 msec Radius at 2nd maximum: 872.5 ft Diameter: PPG - Eniwetok - Yvonne Site elevation: FIREPALL DATA: CRATER DATA: LASL N &§E Sea Level 17 ft TYPE OF BURST AND PLACEMENT: Surface burst from platform on coral soil CLOUD TOP HEIGHT: 38,000 ft MSL (Ref 105) 40,000 ft MSL (Ref 112) 4oh ft bu ft 15 ft CLOUD BOTTOM HRIGHT 22,000 ft MSL (Ref 105) 13,000 ft MSL (Ret 112) REMARKS: The dose-rates shown for the islands of the atoll are based upon ground and aerial surveys timude by the Radiological Sufety organization and by Project 2.65. The dose-rate readings in the immediate environment of the crater were calculated from survey readings at low tide on Dt1 day and Dte days, after the reef around the crater had been flushed by at least two high tides. The measured field gumma decay exponent was used to extrapolate the readings to H+l hour. The one reading which gave an H+l hour dose rate of 57,000 r/hr was uniquely high and may have been due to one of the extremely radioactive, partially fused, pieces of metal scattered about near the crater. 101