ou en TementeoyBg3“RTOGERURVETEGHORUE-— Lr. Intensity (mr/hr) 14009 May G-day 1i00010May GH 11May G2 12May G43 15May Gi6 22 May G+13 0.2° 0.2 0.03 3.2 0.4 0.2 0.2 0.3 6 0.4 0.2 0.2 0.2 0.2 0.2 0.2 0.3 0.3 0.4 0.2 0.2 0.4 1.0 0.4 " Aniyaanii Runit Piiraai Bokon Engebi Teiteir 2.4 Bogallua Rigili Giriinien Igurin | 30 1.6 1.0 0.4 10 30 1.6 1.0 0.2 29 with W. E. Ogle’s neutron sample recovery party on board an AVR, and they weretold to remain about one mile offshore. At approximately 0830 the intensity had increased to 2 r/hr outside Building 69. The intensity then began to decrease rapidly, and at about 0930 it had declined to 200 mr/hr. Shortly after arrival on the island two dogs were seen wandering about in the vicinity of Ogle’s winch. One of the dogs came to Building 68, and it was given food and water. It appeared to be in a good state of health. Ogle’s AVR landed about 0945, and the recovery began. The cable, as usual, was broken about 100 yd from the winch. Gen Cooney accompanied Frederick Reines and party up to the 600-yd station to remove the neutron samples. Later a caterpillar tractor pulled in the rest of the land cable. The water cable was also broken, and only a portion of the samples were recovered on the first day. Recovery work progressed in an orderly manner, and all parties were off the island well before sundown. On I+1 the usual radiological safety survey was made, and further recovery work progressed. On I+2 days all scientific material was removed from the 200-yd collimator station without any undue overexposure. On 3 days the remaining portion of the water cable was recovered which completed all the recovery work on Engebi. At approximately H+3 hr 23 min the gamma ray recorderat the radiological safety building on Parry Island showed a sharp rise, followed 28 26 by a drop to nearly the original reading. This “spike” was interpreted as the result of the passage of an active cloud from whichlittle material fell out. Several other spikes, followed by a steady rise in activity due to fall-out, continued until about H+4 hr 45 min. A telephone call was made at noon to Japtan, and it was learned that a lesser amountof fallout had been detected there. A telephone call to Eniwetok established the fact that considerably more fall-out had occurred on Eniwetok than on Parry. Thomas N. White and Gen Cooney flew to Eniwetok and, accompanied by Maj Scott and Capt Tuuri, made a complete radiological survey of the island. The intensity at that time was from 50 to 100 .ar/hr on the upper end of the airstrip and approximately one half this amount in the vicinity of the bathing beach and thetent area. White and Gen Cooney returned to Parry Island and at about 1600 noted an increase in gammarayintensity. This fall-out continued until about 1830, From H+16 hr the activity behaved according to a t™!*? law. A continuous record of gammaray intensities was maintained. The integrated dose out-of-doors was determined by numerical integration of the intensity curve in the early phases and from direct dose measurements in the later phases. Telephonic communications with the USS Curtiss established the fact that fall-out of approximately the same intensity was occurring on the ship. A survey made on the northern end of Parry Island at approximately 1800 established the fact that the intensity there was less by Bs,ceo - SE “ween 4 eee re Tie reece eM Ex_-rsemietntansnipnaninatiatllmeena:ere 7 1.0 14 1.0 0.8 0.3 Te tee rrne 1 tan we ene ry Ps ee me ewe 8 Te ere NA Mt er ee ee