After Shot 1 the concentration of the Yersene in the aqueous phase was changed to 1.75 per cent. The concentration of the reservoir solution was also changed to 10.7 per cent Aerosol OT and h.7 per cent Yersene, A hand-controlled gate valve was located 9 1/4 in. above the bottom of the cone so that the aqueous phase could be easily drawn off. A quick-opening valve was located at the apex of the cone so that the solid material could be drawn off with the organic phase, An evaluation of the collector operation is given in Appendix D. 3.2.2 Intermittent Fallout Collector This instrument consists of a series of 2h trays which are exposed in turn to the fallout for any arbitrary period of time from 1 te 30 ming It was used in this project for the investigation of variations in radiochemical composition with time. A complete description can be found in the report of Project 2.5b, 10/ 3.23 Laboratory Trailer Analytical work at the test site was carried out primarily in the laboratory trailer, Radiac Sec AN/MDQ-1, obtained from the Signal Corps, which was set up on Parry Island, Eniwetok Atoll. tion is given in TM-11-5537. 3.2.4 A descrip- Station Layout Two-phase collectors were located as shown in Table 3,1. TABLE 3.1 - Station Locations Islands Distance from Ground Zero (ft) Shot I _[ “BiMInt Atoll How : Nan Victor 97,730 122,230 62,500 Yoke 54,470 Bravo u?, 70 Fox Oboe Tare Eniwetok Atoll 50,600 Stot 3] shot & 69,280 28,430 43,190 59,520 83,660 77,800 Mack 47,700 Janet Mary 14,400 28,800 Project 6.5 Barge 35,000 19 SECRET — RESTRICTED DATA