TABLE 2.5 (Continued) Fre prea Bomoay, Welbourne, Australia nekong ta webs Formosa wo ourk AcF.Be, Pole ua Johnston Teland French Frigate Shoals Midway Wake Island Canton island Trakfata tr sland ster Honolulu Hilo M¢ 15 Me 30 e 30 too 20000 isp000 9000 * 990 1300 6300 500 N00, S300 200 to MIKE, 2) M+ 61 x My 61 ° ” 80 110 “Ie peo 00 0000 *AO00o e008 300 890 Io “0 _ eye 4000 _ 390 260 700 Indis Tallington, Mow Zealand x P rere” i w415 Fer the purpose of extrapoiation the activity of all samples collected auring tne mirvey was arbitrarily attributed 100 2700 00 4500 3200 _ "eo 2700 0 1500 22000 20000 =. 260 70 710 3700 2000 170 250 ibe 1300 30 340 4500 900 to KING. Cotes Fallout after the First Thirty Daya Ms 61, 21,00 2900 6304 Figures 2e7 ud Geb show the fal lout from Mb 39 to In the Unit-uo States the average was -60 d/m/ag ft and in the reat of the world the averare wee “0. The close agreement @Qppears to be consistent with the idea that the active particles had been dispersed throughout the world atmosphere, The impression of dispersion ie reinforced by the amail range of total fallout, from Mito M4 61, over the United Statee (Figure 2.9), and by the fact that measurable fallout occurred, aooner or later, at avery domestic atation and nearly every foreign station (Figure Zsl0). 2e2el, Sampling Precision 25000 7000 m—= Data based or sanples collected after the }%sth day therefore contain an slement of uncertainty because of the possibility that a significant portion of the activity was due The error in estimating fallout at a collection station from an individual sample, as measured by tha coefficient of variation (ratio of ateandard deviation to mean), computed from _ the firet 250 paire of settled dust samplea, is approximately 50%, Studies of data from an earlier survey (1,) indicated that the finding may be applied to a large region surrounding the station without serious loss of preoision, The figure of 30% includes no allowance for the efficiency of tre collection method or for other sources of syatemtio error. Although the totals shown on the maps ere more precise shen the dete of individual samplas, they sy be influenced greatly by exceptional rasulta, auch as the maximum caily fallout at Iwo Jima, discuesed in Section 2e2el, above, 2e2e5 Radioactive Dust Concentration of the Air at Tround Vevel The concentration of radioactive dust in the atmosphere, as measured by counts of filtered samples, was negligible compared to the reaults of surveys made during continental teats. The “25 maximum for each atetion ie given in Table 24,