soe
Nae
mA
SMTA DR BT
he ee ee ae
mabe
Mr Ne a tatee ree
FIGURE I.
Pu-239/Sr-90 Ratio at 19.2 km
SON [
+
|
lor
20 ;30
40-F
90 [6ol-* +t
7OoOguLe—1
Ju
1
dy Au
dd
S
O
1967
N
OD
J
F
|
Mr
Ap My
Ju Jy Au
1968
S
OF
N
D
J
F Mr
IS69
Ap My
CONTOURS ARE IN PERCENT. ARROWS INDICATE THE DATE AND RANGE (SMALL ARROWS-KILOTONS, LARGE ARROWSMEGATONS) OF ATMOSPHERIC NUCLEAR WEAPONS TESTS IN EACH HEMISPHERE.