209
180
180
Sr®in Pittsburgh Fallout
170
Pure tropospheric =130 for Sr 89/Sr 9°
160
Pure stratospheric =} to 10 for Sr89/Sr 9°
150
(NSEC Data)
140
130
m_a
—_
ote Aue?
od
o
wm
oe.
—_
ao
eo
o
Activity Ratio (Sr 897 Sr 9°)
120
50
40
30
20
o}..
;
°8
t
"aptsMie Bay”
wid
: ait
10
feptumenoe—s|
;
3
> |,
oii
JAN.
FEB.
MAR.
APRIL
MAY
JUNE
JULY
AUG,
1958
Figure 6
”
DOs ARCHIVES
SEPT.