166
80
TTTTTT
ax
25
4
s 20 t+
=
x
ws
—
O 15;—
EFe
Z 19 |. TROPOPAUSE ae
> F-
ob
10°
30
a
X
]
A >0.15 p RADIUS
X 0,02 TO 0.15 p RADIUS
® <0.02 p RADIUS
top rit
10!
>
© TOTAL
pop pil fb pat a
10?
103
104
TOTAL B7, NET COUNTS/MIN X G/M3(S.T.P.)
TTT
TT TTT
(=.
me
|
x
Iw
x
a
> 15
-&
x
< 19 LTROPOPAUSE =
a
5
7
poop
pt
10!
10
10°
M4Ce CONCENTRATION, DIS/MIN PER CUBIC METER (S.T.P.)
104
aT
ALTITUDE, KM
10°
—
—
he
0
10°
10 }- TROPOPAUSE —
0
107!
—
=o
Lett]
[
ttyl
i jit
10°
10!
107
9S, CONCENTRATION, DIS/MIN PER CUBIC METER (S.T.P.)
Fig. 2—Radioactivity data for impactor —filter collections over Minneapolis, Minn. (45°N 93°W), on Mar. 16, 1962.