99 TABLE 1 . Altitude (thousands of feet) Duration (minutes) Number Concentration (em73) Volume Concentration (cm /cm3) Sample Number Date Collected P-1 3/3 60 (205) 71:00-+-51:17N 0.30 2.81x10!° P-2 3/22 50 (208) 27:43-+48:00N 0.18 1.39 x i0°1® Latitude Sr 90 . Concentration in aerosol (dpm fem? of particles) -~ 1,02 x 10° 55 (176) P-3 3/29 40 (60) Orbit 45:45N 0,19 1,01 x 10 P-4 3/31 55-64 (406) 37:00-+48:25N 0.16 2.35 x10 > 1.81 x 10° P-5 4/12 40,5 (172) 67:00--50:25N 0.21 5.19 x 10°)? 7.40 x 10° P-6 4/30 65 (147) 65:50750:20N 0,45 4,59 x io} 1,09 x 108 P-7 5/19 50 (377) 36:40=-40:00S 0,09 9,93x10 1° 2,90 x 10° P-8 11/17 60-68, 6 (341) 62+32N 0,044 3,01x 10°” 0.17 2.67x 107° 55+65 (319) AVERAGE POLAR . “15 “45 4,87 x 10 3 -- 2.18 x 10° T-1 2/25 60 (181) 65 (186) 27:42 +«13:42N 0,28 3,25 x 10 T-2 3/16 66,8 (357) 27:42 -22:00N 1,23 9.95 x 10°)? 3.65 x 10! T-3 4/5 64,5>68,6 (401) 15:00N=8:008 0.38 8,38x10/° 3,22 x 10! T-4 4/21 60-65 (210) Orbit 1,33 2.10 x 10 6,86 x 10 ~14 48:00N 7 2,94 x 10 T-5 4/21 50 (193) 55 (181) 27:43+ 48:00N 0,48 5,22 x 10 T-6 5/12 63-67 (442) 16:25N-29:208 0,33 9,35 x i073? 3.04 x 10! 0,67 9,.52x10 °° 4.49 x 10! AVERAGE TROPICAL . 7 “15 5.98 x 10 7