Ft.
100,000 PF
TT
!
|O
r
Km.
T_T
TTL 30
AIRCRAFT OBSERVATION
O NRL SURFACE STATION
4
80,000F-
=
|
0.1
1 0.2
ot |
ll
60,000 OO ar
;
0.3
oO Sa
0.45 2
Oo 03
40,0000 8.
rl
o*
eee
988
78
2 55
0
4
_TROPOPAUSE
ee
PF O38 Leer
Lo 20
|ko4
0.3
0.3
oo
O.
“IS
ots
+203
4
~~
~
L
=
00.3
- 25
_
0.5
16
MEAN
03
o oF
Doe
- 10
OOF
20,000
4
a 0.8
66
ob 80.3
--
0
7
90°
O
°
bod
60°
4
0 0.5
-5
oO
O
1 4g
lo
30°
i
08
08
8
eee
OO;
O°
NORTH
30°
8?
60°
Lilo
90°
SOUTH
Pb
210
d/m/|lO0O0 scf
Fig. 4 -- Lead-210 distribution
31