ALTITUDE (THOUSANDS OF FEET) lOO | SOF A > 0.15p RADIUS x 0.02-0.15y @< 002, — --- 20} lO 0 a lO 4 20 30 FLIGHT 2468, 7JUNE 1960 FLIGHT 2488,110CT. 1960 40 50 60 70 80 PERCENT TOTAL BETA ACTIVITY Tg Fig, 2 -- Size distribution of fallout particles vs altitude 90 | 00