small. No samples suitable for particle analysis were obtained from Shot 3. Followiny Shot 1, 6971 radioactive particles were analyzed from the area within the Bikini Atcll and 621 particles collected on the outer atolls of Ailinginac, Rongelan, and Utirik were eveluated. The differential fallout collector on the island of Alice contained some particulate from Shot 6, These data are also presented. 5.2.1 Shot 1, Close-in Faliout The size distribution of close-in fallout particles with resnect to time for four lagoon and thrae island stations are given in Apnendix C. Only radioactive particles ave inciuded in the date. Of the 40 available sampling increments within each differential collector, those increments that visually appeared to contain a large amount of particulate were selected for analysis, Increments over a wide time period were likewise selected. Analysis of the bar gravhs with resrect to rate of arrival or time of arrival is therefore an approximation. Data on tine of arrival are presented in Section 5.6 of this report. Figire 5.4 shows the gsiza frequency distribution of the Shot 1 close-in particulate. It is a comsosite of the bar gravhs for the four lagoon and three island stations. (Figs. C-1 through C-7.) Fivure 5.5 is a plot of the cumulative size distribution of Shot 1 particulote presented en a lop probability eraph. The size distribution is very close to log normal with u geometric mean particle diameter of 112 p 5e2e2 §=Shot 1, Cuter Island Fallout Satples of earth were collected ty the outer island survey veam following Shot 1.15/ The radioactive varticulste found in these scil samrles was analyzed for size distritution and the recults are presented in Fir. 5.6. These atolls were 70 to 2°0 nautical miles from Shot 1. Firure 5.7 shows a loz normal] size distrittion for particles collected on three atolls. ‘The raometric meen particle diareters are presented in Table ©.A. TasL™ 5,4 - Geometric Mean Particle Diareter Atoll f " Bikind | Ad linginae | Reagelon L Utirik | Distcncee from! Geonetric Mean Shot Point |farticle Dieareter (n mi) (u) | 10 112 | 70 £9 107 ‘ 277 [ 59 70 /, ° : '