ae ee Lote a we eeeee eT TT ON en operation was given by all scientific groups, and all work could have been donc under murmzi conditions with no exposures exceeding 300 mr, The integration of the monitors with their respective programs proved very effective. Suf- Rinit. At H+5 hr, fall-out was detected 10 to 18 -miles east of Engebi. , The various cables on Engebi had been covered by huge piles of loose sand, extending across the island in various directions. Tons of this material were picked up and spread by the lower winds from Piiraai to Bogallua. However, it was possible to complete all scheduled E-day work with no excessive exposure. During the night of E-day and the early morning of E+1, a fall-out occurred on Eniwetok, Parry, and Japtan. This was insignificant, amounting only to 2 or 3 times the back- ficient supplies and instruments were available except for one item, the air filtering devices. These dust collectors were ordered more than nine months in advance from the Mine Safety Appliance Co. Numerous follow-ups were made on this order, and delivery was repeatedly assured. Had this equipment been present, the investigation of the fall-out would have been facilitated. Results of island surveys following Dog shot appear in Appendix A, and results of atoll surveys are given in Table 2.1. TABLE 2.1 ground, Work progressed satisfactorily on Engebi. Holmes and Narver performed excellent service in wetting down the roads and working ATOLL SURVEYS, DOG Intensity (mr/hr) 1500 8 April D-day Eniwetok 25 7q Parry Japtan Aniyaanii Biijiri 60 70 50 1 15 12 15 0.5 Engebi Bogallua Rigili Giriinien Ribaion 2 “2 400 500 0.2 0.4 180 160 120 Pokon Mui Igurin 2.3 10009 April D+1 250 150 100010 April D+2 62 62 40 083011 April D+3 12 April DH 13 April D+5 2 2 1 5 1.0 6 6 3 0.05 5 5 2 0.03 3 3 1 0.03 0.1 0.03 80 48 38 0.1 0.03 45 29 25 0.03 0.03 30 18 14 0.03 0.03 24 12 12 38 29 12 20 20 7 14 12 9 10 8 5 EASY SHOT The wind structure as predicted at H-30 hr appeared ideal. The hodograph prepared by the meteorological service predicted the fall-out of the 50- to 200-micron particles at a distance of some 35 miles southwest of Eniwetok. However, the wind pattern changed, and, at the weather briefing at midnight prior to the shot, the hodograph predicted an area of fall-out of these __ particles inside the lagoon in the vicinity of - pee areas, materially reducing the hazard from dust. As a result, very little contamination of clothing occurred. One group of three film badges from three sailors, all of the same boat crew, showed unexplained high exposures of 10 to 20 r gamma and 15 to 30 r beta, acquired between 21 and 23 April 1951. Another sailor, although a member of the same boat crew, wore no film badge. In view of the above findings, the subject men were required to have a complete radiological we tenes wes metas Bmee me npr - 6—- - SCOONETOERTT EC