OPERATION REDWING - TATE: TIME: PPG Time 11 Jul 1956 0556 Navajo GMT Sponsor: 10 Jul 1956 1756 SITE: LASL PPG - Bikini - South of Dog 11° 39' 48" WwW 165° 23' 1h" &§E Site elevation: HEIGHT OF BURST: Sea level 15 ft TYPE OF BURST AND PLACEMENT: Surface burst from barge on water; center of gravity approx. 15 ft above surface of water; depth to bottom-215 ft CLOUD TOP HEIGHT: 85,000 ft MSL CLOUD BOTTOM HEIGHT: 51,200 ft MSL REMARKS: The on-site fallout pattern was drawn from island readings taken by scientific projects supplemented by fallout sample collections on rafts and barges in the lagoon. The survey readings were obtained on D-day. A gamma decay exponent determined from laboratory gamma decay measurements, was used to convert the D-day readings to Ht+tl hour values. Light fallout occurred on Nan approximately 18 hours after detonation, with peak yvamm intensities of 22 mr/hr. The off-site fallout pattern was drawn from aerial and oceanographic surveys: The oceanographic surveys used detector probes for measuring the dose rate at depths to and below the thermocline. Water sampling equipment was used for taking of surface samples and for the collection of samples from any desired depth. The dose rate readings were extrapo- lated to Htl hour by using the decay measurements of the samples collected. 169