104 oel FETE rrr ti L bi Pp PPP Pee Ta, 1000 FT — 6 ALTITUDE, 2 -— ~~ 5 48-52 47— — ate GAMMA COUNTS PER MINUTE PER 10? SCF 104 PPP PTT TTT TT TT 10? -}— in a 6 58-68 4 7 6 9 10 7 69-71 76-83 85-93 100-108 > @ CONCENTRATION——J 103 a t-— -— 6 }— 4k IN DOUBT —| 3 * ALTITUDE IN DOUBT _ 1 6 6 —4 — 2-— a 9 7,\ 10? |-—\75 a — 2 ‘ 10 ab~ ~4 Py oy é = 10? a t= —{ 8 — —_— 6 o — —1¢ —_ 2-—- — 2 4-— —j{4 ott itis ititirv tty eet tte te et tpi tty terri JoFMAM J J 1962 AS ON DOD JY F MAM J J 1963 A S ON OJ F MAM J J 1964 Fig. 2—Gamma activity concentrations at 34°S at Mildura, Australia. AS = ON OD i,