170
DREVINSKY AND PECCI
30
TOT TTT
25 |-
TT TTTTTT
x
_
SS
20 |=x
ur
Sst
E
z
+
-
TROPOPAUSE ——
10 --
10°
30
25
=pa
@ <0.02 » RADIUS
7
o TOTAL
Popa riiith
10!
TT TTT
-
—
d >0.15 y RADIUS
x 0.02 TO 0.15 p RADIUS
5 |
0
~
x
+
oy
pa
10?
tt
TOTAL B , NET COUNTS/ MIN x G/M
TTT
10°
OT ty OT
+
—
He
20}
>
Sis
215
7
a
TROPO PAUSE —
10 F-
107?
-
~
5
0
104
pop tii
107!
LoL titty
10°
Popeeitit
10!
yp ei
90S; CONCENTRATION, DIS/MIN PER CUBIC METER (S.T.P.)
Fig. 3—Radioactivity data for impactor —filter collections over Minne apolis, Minn. (45°N 93°W), on Aug. 15, 1963.
10?