” ° * 20 z PERIOO OF FALL-OUT . 3 10 2 - 2 oO 0 20 7 40 #260 vopmonon’ 100. 120. i 80 i (oy 140 i 160 j 180 TIME, MIN oty 540.18-8 MILES CROSS WIND 4 2 = 20F PERIOD OF. FALL-OUT ~ oO = 10 2 - < olotad 0 45 90 4 PERIOD OF o e) = ™ 10 2 ~ 135. 180 228 TIME, MIN . 270 «2315 360 405 STN 540.16-10 MILES CROSS WIND meer r 8 2 - Q ACTIVITY, C/Mx10-3 < Oo eo ore 45 90 ferore 138 a 180 225 TIME, MIN TIME, MIN 270 5 9318 360 STN 54015-15 MILES CROSS WIND STN 540.09-15 MILES CROSS WIND Fig. 4.11-—~Periods of primary fall-out at different stations. 46 408