Table 1—SOURCES OF RADIOACTIVE
FALLOUT TO DECEMBER 1957*
Country
Latitude
Mt
Tropospheric debris
U.S.S.R.
50°N
1.7
U. S. (Nevada)
U.S. (Pacific)
37°N
11°N
1.0
1.3
U. K. (Pacific)
U.K. (Australia)
3°N
35°S
1.5
0.1
Stratospheric debris
U.S.
24.8
U.S.S.R.
11.2
* Data from W. F. Libby.
ia
|
10°
0°
sr%° MC/SQ MILE
q
0
90° 7o* 6o® 50°
RELATIVE UNITS
1.0
2
a
=
05
=
—
40?
80?
20°
NORTH LATITUDE
/
\
KNOTHOLE
obt e+—tT
90° 70" 60" 50°
(a)
aan
/
I’ sespor- \
“
10°
_—
NS
re
\
/ castre
\
\
~~
|
ee
—
—
~~
po
10°
ee
j
50* +60" 70° 90°
_
\
“ao™ ee
40°
30°
20°
NORTH LATITUDE
20°
30°
40,
SOUTH LATITUDE
oF
(b)
—
—
~ ~~
7
eaten
10°
20°
30°
«40
SOUTH LATITUDE
50° 60° 70° 90°
Fig. 2——a. Total tropospheric fallout: --- United States; -—~~, United Kingdom; —+—- ~, USSR.
b. Observed tropospheric profiles from U. 8. tests.
1953 in Nevada centered around 37°N. Essentially, all the fallout that is deposited is tropospheric because the tests in Nevada are rarely powerful enough to throw debris into the stratosphere. The lower part of the same figure shows a pattern around 11°N. This is the fallout
that has occurred within the first 30 or so days after the Castle test series at the Pacific
329