OPERATION REDWING PAPE: TIME: 2) Jul 1956 _— O5)6 Towa sponsor: 20 Jul 1906 OlTr: 1746 UCR PPG - Bikini - Charlic - Dog Reef 12° ko! TOTAL, YINTD: 5 Mt 165° 20) 26" e2" Site elevation: FIRERPALI, DATA: “Timetolst minimum: 185 to 2h0 msec Time to 2nd maximum: 2.08 sec Radius at 2nd maximum: 5,904 ft CRATER DATA: Diameter: Depth: 4,000 ft HELGHT OF BURST: ON 3 Sea level 15 Pt ie OF BURST AND PUACKMENT: surface burst from barge on water; center of gravity 15 ft above surface of water; 129 ft depth to bottom 25 ft. CLOUD TOP HIGHT: 99,000 ft MSL CLOUD BOMPOM HEIGHT: NM The on-site fallout pattern was drawn from island readings taken by scientific projects, supplemented by fallout sample collection on rafts and barges in the lagoon. Actual field decay meusurements indicated a decay exponent This decay expononl was used to extrapolate the dose rate readings to H+] hour. The extremely heavy rains which followed this shot had no observable effect on the decay rates. On all islends the contamination remaining from previous shots was negligible in comparison with the high radiation levels produced by this shot. Very slight fallout occurring approximately 18 hours afler firing inercased the background on Nan by approximately ) mr/hr. In contrast to the other bare shots, contamination was also ecxptrieneed on the atoll's southwestern islands. The off-site fallout pattern was drawn from 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 the taking of surface samples and for the collection of samuoles from any desired depth. The dose rate readings were extrapolated to H+). hour by using the decay measurements of the samples collected. Fallout from the firing of this device contaminated Fniwetok atoll. The fallout on Fniwetok commenced approxinately 9 hours after the device was tired with a peak of 100 Lo 120 mr/hr. 175