RADIOACTIVITY VS. HEIGHT IN NUCLEAR CLOUDS 0.9 633 T 0.6 | 0.7 _ 0.6 — 0.5 + 0.4 4 0.3 = 0.2 4 Fig. 2—Ratio of air density (p) to standard sea-levelair density (pp = 1.293 x 107 g/cm) as a function of altitude. 0.1 0 | 0 120 | I | | 20 40 ALTITUDE, 10° FT | 60 DT TTT TT Tg, a 4 100sew BASE OF MUSHROOM onmumeneree _ <= Oo = TT — & e 4 — e | a “a 4a 80 -— = a [ flee O 60-—Lit ~ an — a& ° 7 a - & — Ww 40e- ® DOMINIC DATA © STEM NOT VISIBLE 4 o jo ® UNKNOWN @ STEM VISIBLE — L “AIR BURST SSURFACE BURST — 107! 10! 7 on gt ——_ 10% REDWING DATA _] bia Ztye 1075 104 1033 107? 10° PERCENT OF TOTAL ACTIVITY PER 1000-FT- THICK LAYER Fig. 3—Variation with height of the percent of the total activity residing in a 1000-ft-thick horizontal layer of the cloud.

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