account of the low yield of the device. from Georze. A ground sample was obtained 3.3.2.4 Shot The Shot device was detonated en a barge in the northern part of Bikini Lagoon at 0610 local time, 26 April 195), The two- phase collectors were not activated for this event, Samples from the intermittent fallout collector on Fow were obtained from Project 2.5b, This rroject did not participate in Shot 5, No satisfactory samples were obtained from Shot 6, A summary of collector cperation is given in Table 3,2, TABLE 3,2 Station Shot 1 Rowe San Victor Toke Bravo Fox Obee Falled to Close Satisfactory Sstiefactory Damaged by flying debris Failed to Close Satislaetory Did not operate; electrical failure Did not operate; alectrical failure Tare Meak Two-Phase Collector Operation Shot 3 > Fetled to close Satisfactory Satisfactory Triggered before shot Shot 6 ] Hid not operate Project 6.5 Barge Fotor burned out before shot on account of shot 1 damage Satisfaetory Satisfactory Jaret Vary 3. 3.4.1 ANALYTICAL METHODS Particle Size Separation In order to meet the first objective cf this project, it was necess2ry to size grade the sample in such a manner as to provide a’ sufficient quantity in each size range to perform the required analyses. For this reason it was decided to use standard sieves down to the smallest particle size possible and the Roller analyzer below that point. The limitations of these techniques are discussed in Section 5.2. The mixture of solid fallout and approximately 50 ml of the chiorobenzene from the two-phase collector was slurried on a Uh p sieve and permitted to settle through the sieve. This procedure was repeated three times. The sieve was then tilted and the chlorobenzene solution that had settled through the sieve was re-added with a dropping pipette so that the solution settled through an exposed section of the sieve, When all the particles were washed to one side of the sieve, the sieve was tilted in the other direction and the process repeated, Care was exercised to keep one section of the sieve clear of large particles 22 SECRET ~ RESTRICTED DATA