202 WORLDWIDE NETWORK Asa first step in summarizing the sotivity data, the age wee standardized by extrapolating to January lsat, 1953. Since the #tandardized activities are additive, the reeulte for & serine of days may be totaled and this waz done for each station. The mape, Figures 2.3 to 2010 show the activity on January ist, by station, due to fallout e:surring during the 61 days from MIKRB shot to the end of the year and during each & three periods into which the 61 daye were divided. The density of the network in the United States required separate maps for domestio and foreign data. To facilitate identification of the stationa the date arc also listed in Tablew 2el, and 2.56 The spread of fallout around the globe was followe) by observing the tine of the firet appearance et esoh ataticr ° a tivity clearl: greater than normal, The datea, mapped in Figure 2.11, show how the debris spread around the world. Fig. 2el2 follows the movement of radioactive debris within the Unitsi Statese 2e2e) Fallout during the First Fifteen Days after MIER The average fallout in the United States during this period was 290 d/m/eq ft (extrapolated to January lst) and the worldwide average excluding the United States wae 8100 d/m/sq ft. Most of the activity contributing to the latter figure fell at Iwo Jima on the third, fourth and fifth days after MIKRE. The fallout on thie island was found to te 83,000 a/m/sq ft on the 3rd day, 165,000 on the Uth and 57,000 on the 5th. The figure of 165,000 d/m/sq ft on January lst, due to faliout on the Lith day after MIKE, corresponds to 3,600,000 d/m/eq ft extrapolated to the day the fallout ocourrede 2e2e2 Fallout curing the Second Fifteen Days Maxime fallout in the United States oocurred during this periods The average (extrapolated to January 1st) was 910 d/n/sq ft, while stations outside the United States averaged 1600. The drop in the worldwide average ic due almost entirely to decreased fallovt at Iwo Jima. If this ialand hed not been included, the average for the first fifteen days would have been only 2300 d/a/agq ft instead of 8100. wl2e