accountof the low yleld of the device, from Georze. A ground sample was obtained 3.3.20 Shot The Shot h device wes detonated on a barge in the northern part of Bikini Lagoon at 0610 local time, 26 April 1954, phase collectors were not activated for this event, The twoe Samples from the intermittent fallout collector on How were obtained from Project 2.50. This rroject did not partictpate in Shot 5, No satisfactory samples were obtain* from Shot 6, TABLE 3,2 Station . Shot 3 Failed to Close Men Victor Oeece Two-Phase Collector Operation Shot 1 Row, Yoke Bravo Fox A surmary of collector operation : Satisfactory Satiefactory. . Tare. Damaged by flying debris Pailed to Close Satisfaetory Did not operate: electrical > . Snot 6 Feiled to close Satisfactory Satisfactory Triggered before shot failure Did not operate; electrical failure Meck Project 6.5 Barge . Jaret Vary Did not operate : : . Motor burned out before shot on account of shot 1 Gamage Satisfactory Satisfactory 3.4 ANALYTICAL METHODS 3.4.1 Particle Size Separation In order to meet the first objective cf this project, it was necessary 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 standerd 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 chlorobenzene 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 lerge particles 22 SECRET ~ RESTRICTED DATA